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Fixed Magnification Beam Expanders: Achromatic


  • 2X, 3X, 5X, 10X, 15X, or 20X Beam Expansion
  • Sliding Lens Design for Collimation Adjustment
  • 3 Broadband AR Coatings Available

GBE02-B

2X Beam Expander
650 - 1050 nm AR Coating

GBE05-C

5X Beam Expander
1050 - 1650 nm AR Coating

GBE20-A

20X Beam Expander
400 - 650 nm AR Coating

GBE10-B

10X Beam Expander
650 - 1050 nm AR Coating

Related Items


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Mounted Beam Expander
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A GBE15-C 15X Beam Expander Post Mounted with two SM2RC Slip Rings
Beam Expander Front and Back Views
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Input (Back) and Output (Front) Apertures of the GBE02-B 2X Beam Expander

Features

  • 2X, 3X, 5X,10X, 15X, or 20X Beam Expansion or Reduction
  • 3 Broadband AR Coating Wavelength Ranges
    • A: 400 - 650 nm
    • B: 650 - 1050 nm
    • C: 1050 - 1650 nm
  • Sliding Lens Adjustment that Minimizes Beam Walk Off
  • Housing with Fixed Mechanical Length and Non-Rotating Ends
  • Collimation Adjustment Ring can be Locked with Included Hex Key
  • Can be Used to Reduce Beam Size by Using the Larger Aperture as the Input
  • Threaded Apertures for Integration into Optical Systems

Thorlabs' Achromatic AR-Coated Galilean Beam Expanders can expand or reduce the diameter of a collimated beam by a factor of 2, 3, 5, 10, 15 or 20.  These beam expanders use a low-aberration, achromatic design optimized to provide a wavefront error of less than λ/4 (i.e., diffraction-limited performance) and minimize the impact on the M² value of the expanded beam. An expanded beam can be focused to a narrow diffraction-limited waist, which can be necessary for use with optics or instruments that have small input apertures such as our Fabry-Perot interferometers.

The beam expanders use an achromat and a lens fabricated from N-BK7 and N-BASF2. To minimize reflections at the air-to-glass interfaces, the optics used in these beam expanders have one of three broadband AR coatings deposited on both sides of each lens incorporated into the design: 400 - 650 nm (Item # ending in -A), 650 - 1050 nm (Item # ending in -B), or 1050 - 1650 nm (Item # ending in -C). The AR coatings reduce the maximum reflectance per surface to <0.5% over the specified coating ranges, compared to a typical reflectance of 4% per surface for an uncoated optic. See the Specs and AR Coatings tabs for more information on the coating performance.

The sliding lens design allows for the collimation to be adjusted while minimizing the beam walk-off effect that is inherent to lens adjustments. The red ring, shown in the photos above, is used to adjust the output beam collimation; once the desired collimation is obtained, the ring can be locked by tightening the locking screw using the included 0.05" hex key. The housing is designed so that it does not rotate when turning the collimation adjustment ring, allowing the user to adjust the divergence without disturbing any attached optics and maintain pointing stability.

Mounting Features
These Galilean beam expanders have threaded input and output apertures, which allow additional lenses and filters to be installed easily along the optical axis of the beam expander. The input of each beam expander has internal SM05 (0.535"-40) and external SM1 (1.035"-40) threads for ease of use with Thorlabs' lens tubes and other optical components. The output of the 2X beam expanders is externally SM1 threaded as well. The beam expanders with 3X, 5X, or 10X expansion have an externally M43 x 0.5-threaded output, which can be integrated with SM2 (2.035"-40) threaded components by using the SM2A30 adapter. The Ø1.2" section of the barrel on the 2X, 3X, 5X, and 10X beam expanders provides a smooth mounting surface with the same diameter as our Ø1" lens tubes. The 15X and 20X beam expanders have an externally SM2-threaded output and should be mounted using the wider Ø2.2" section of the housing, which is the same diameter as our Ø2" lens tubes. See the Drawings tab for details.

Post mounting options include the SM1RC(/M) Lens Tube Slip Ring and SM1TC Lens Tube Clamp. Alternatively, the 2X through 10X beam expanders can be integrated in one of our cage systems via the CP12 30 mm Cage Plate or by using the SM2A21 mounting adapter with the LCP09 60 mm cage plate. 15X and 20X beam expanders can be mounted directly into a 60 mm cage system using the LCP09. We also offer the SM1A52 adapter, which allows the input to be mated with components using the M30 x 1.0 thread standard. Recommended mounts are available below.

Thorlabs also offers many other types of beam expanders, including UV fused silica fixed beam expanders for narrowband applications, mid-IR fixed beam expanders for CO2 laser applications, variable zoom beam expanders, and reflective beam expanders. For more information on our extensive line of beam expanders, please click on the Beam Expanders tab.

Item # PrefixGBE02GBE03GBE05GBE10GBE15GBE20
Expansion 2X 3X 5X 10X 15X 20X
Max Input Beam Diameter 9.7 mm 10.6 mm 7.0 mm 3.5 mm 2.9 mm 2.2 mm
Diffraction-Limited Input Beam Diametera 8.5 mm 9.0 mm 5.0 mm 3.0 mm 2.5 mm 2.0 mm
Input Thread Internal: SM05 (0.535"-40)
External: SM1 (1.035"-40)
Output Thread (External) SM1 (1.035"-40) M43 x 0.5b SM2 (2.035"-40)
Surface Quality 20-10 Scratch-Dig
Housing Dimensions
Input Housing Diameter 30.5 mm (1.20")
Output Housing Diameter 30.5 mm (1.20") 45.0 mm (1.77") 55.9 mm (2.20")
Housing Length 52.0 mm (2.05") 85.5 mm (3.37") 135.0 mm (5.31") 202.0 mm (7.95") 267.0 mm (10.51")
AR Coating Specifications
Item # Suffix -A -B -C
Typical Transmission ≥93% @ 405 nm
≥96% @ 543 nm
≥98% @ 633 nm
≥96% @ 780 nm
≥96% @ 980 nm
≥96% @ 1064 nm
≥97% @ 1310 nm
≥97% @ 1550 nm
Coating Type Broadband Antireflection
Coating Range 400 - 650 nm 650 - 1050 nm 1050 - 1650 nm
Max Reflectance per Surface <0.5%
Damage Thresholda 3 J/cm² (532 nm, 10 Hz, 10 ns, Ø408 μm) 7.5 J/cm² (810 nm, 10 Hz, 10 ns, Ø76.9 μm) 3 J/cm² (1542 nm, 1 Hz, 10 ns, Ø268 μm)
  • This is the damage threshold of the AR Coating, which limits the power that the beam expander can accept. Note that if these items are being used to reduce the size of a beam, the power at the exit aperture must not exceed this damage threshold.

The graphs below show the reflectance per surface with respect to wavelength of the AR coatings deposited on both sides of each lens incorporated in our achromatic Galilean beam expanders. The blue shaded region indicates the wavelength range specified for each coating. The table below provides the specifications for each coating.

Triplet Collimator Coating Reflectance
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The blue shaded region indicates the specified operating wavlength range for the coating. Performance outside of this region is not guaranteed.
Triplet Collimator Coating Reflectance
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Click Here for Raw Data
The blue shaded region indicates the specified operating wavlength range for the coating. Performance outside of this region is not guaranteed.
Triplet Collimator Coating Reflectance
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified operating wavlength range for the coating. Performance outside of this region is not guaranteed.
Antireflection Coatings
Item # Suffix Wavelength Range Reflectance per Surface
-A 400 - 650 nma RMax < 0.5%
-B 650 - 1050 nm RMax < 0.5%
-C 1050 - 1650 nm RMax < 0.5%
  • Due to the lens substrates used in these beam expanders, they should not be used below 400 nm. If performance below the 400 nm range is required, we offer beam expanders with UVFS lenses AR coated for 240 - 360 nm.

Simplified mechanical drawings are provided below to provide a comparison of the profiles of the beam expanders. For complete mechanical drawings, go to the Documents tab and click on the red icon () next to one of the item numbers to view the support documentation for that part. Recommended mounting options are provided at the bottom of the page.

2X Beam Expander
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The GBE02-A beam expander viewed from the side. Each 2X beam expander shares the same profile.
3X or 5X Beam Expander
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The GBE03-A beam expander viewed from the side. Each 3X and 5X beam expander shares the same profile.
10X Beam Expander
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The GBE10-A beam expander viewed from the side. Each 10X beam expander shares the same profile.
15X Beam Expander
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The GBE15-A beam expander viewed from the side. Each 15X beam expander shares the same profile.
20X Achromatic Beam Expander
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The GBE20-A beam expander viewed from the side. Each 20X beam expander shares the same profile.
Damage Threshold Specifications
Item # Suffix Damage Threshold
-A 3 J/cm² (532 nm, 10 Hz, 10 ns, Ø408 μm)
-B 7.5 J/cm² (810 nm, 10 Hz, 10 ns, Ø76.9 μm)
-C 3 J/cm² (1542 nm, 1 Hz, 10 ns, Ø268 μm)

Damage Threshold Data for Thorlabs' Achromatic Galilean Beam Expanders

The specifications to the right are measured data for Thorlabs' Achromatic Galilean Beam Expanders. This is the damage threshold of the AR Coating, which limits the power that the beam expander can accept. Note that if these items are being used to reduce the size of a beam, the power at the exit aperture must not exceed this damage threshold.

 

Laser Induced Damage Threshold Tutorial

The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS 11254 and ISO 21254 specifications.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for 30 seconds (CW) or for a number of pulses (pulse repetition frequency specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence # of Tested Locations Locations with Damage Locations Without Damage
1.50 J/cm2 10 0 10
1.75 J/cm2 10 0 10
2.00 J/cm2 10 0 10
2.25 J/cm2 10 1 9
3.00 J/cm2 10 1 9
5.00 J/cm2 10 9 1

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions.

When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Beam diameter of your beam (1/e2)
  3. Approximate intensity profile of your beam (e.g., Gaussian)
  4. Linear power density of your beam (total power divided by 1/e2 beam diameter)

Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. Average linear power density can be calculated using the equation below. 

The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm):

CW Wavelength Scaling

While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. 

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Duration t < 10-9 s 10-9 < t < 10-7 s 10-7 < t < 10-4 s t > 10-4 s
Damage Mechanism Avalanche Ionization Dielectric Breakdown Dielectric Breakdown or Thermal Thermal
Relevant Damage Specification No Comparison (See Above) Pulsed Pulsed and CW CW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1998).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

In order to illustrate the process of determining whether a given laser system will damage an optic, a number of example calculations of laser induced damage threshold are given below. For assistance with performing similar calculations, we provide a spreadsheet calculator that can be downloaded by clicking the button to the right. To use the calculator, enter the specified LIDT value of the optic under consideration and the relevant parameters of your laser system in the green boxes. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. These values are used to calculate adjusted, scaled LIDT values for the optics based on accepted scaling laws. This calculator assumes a Gaussian beam profile, so a correction factor must be introduced for other beam shapes (uniform, etc.). The LIDT scaling laws are determined from empirical relationships; their accuracy is not guaranteed. Remember that absorption by optics or coatings can significantly reduce LIDT in some spectral regions. These LIDT values are not valid for ultrashort pulses less than one nanosecond in duration.

Intensity Distribution
A Gaussian beam profile has about twice the maximum intensity of a uniform beam profile.

CW Laser Example
Suppose that a CW laser system at 1319 nm produces a 0.5 W Gaussian beam that has a 1/e2 diameter of 10 mm. A naive calculation of the average linear power density of this beam would yield a value of 0.5 W/cm, given by the total power divided by the beam diameter:

CW Wavelength Scaling

However, the maximum power density of a Gaussian beam is about twice the maximum power density of a uniform beam, as shown in the graph to the right. Therefore, a more accurate determination of the maximum linear power density of the system is 1 W/cm.

An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. CW damage threshold values typically scale directly with the wavelength of the laser source, so this yields an adjusted LIDT value:

CW Wavelength Scaling

The adjusted LIDT value of 350 W/cm x (1319 nm / 1550 nm) = 298 W/cm is significantly higher than the calculated maximum linear power density of the laser system, so it would be safe to use this doublet lens for this application.

Pulsed Nanosecond Laser Example: Scaling for Different Pulse Durations
Suppose that a pulsed Nd:YAG laser system is frequency tripled to produce a 10 Hz output, consisting of 2 ns output pulses at 355 nm, each with 1 J of energy, in a Gaussian beam with a 1.9 cm beam diameter (1/e2). The average energy density of each pulse is found by dividing the pulse energy by the beam area:

Pulse Energy Density

As described above, the maximum energy density of a Gaussian beam is about twice the average energy density. So, the maximum energy density of this beam is ~0.7 J/cm2.

The energy density of the beam can be compared to the LIDT values of 1 J/cm2 and 3.5 J/cm2 for a BB1-E01 broadband dielectric mirror and an NB1-K08 Nd:YAG laser line mirror, respectively. Both of these LIDT values, while measured at 355 nm, were determined with a 10 ns pulsed laser at 10 Hz. Therefore, an adjustment must be applied for the shorter pulse duration of the system under consideration. As described on the previous tab, LIDT values in the nanosecond pulse regime scale with the square root of the laser pulse duration:

Pulse Length Scaling

This adjustment factor results in LIDT values of 0.45 J/cm2 for the BB1-E01 broadband mirror and 1.6 J/cm2 for the Nd:YAG laser line mirror, which are to be compared with the 0.7 J/cm2 maximum energy density of the beam. While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system.

Pulsed Nanosecond Laser Example: Scaling for Different Wavelengths
Suppose that a pulsed laser system emits 10 ns pulses at 2.5 Hz, each with 100 mJ of energy at 1064 nm in a 16 mm diameter beam (1/e2) that must be attenuated with a neutral density filter. For a Gaussian output, these specifications result in a maximum energy density of 0.1 J/cm2. The damage threshold of an NDUV10A Ø25 mm, OD 1.0, reflective neutral density filter is 0.05 J/cm2 for 10 ns pulses at 355 nm, while the damage threshold of the similar NE10A absorptive filter is 10 J/cm2 for 10 ns pulses at 532 nm. As described on the previous tab, the LIDT value of an optic scales with the square root of the wavelength in the nanosecond pulse regime:

Pulse Wavelength Scaling

This scaling gives adjusted LIDT values of 0.08 J/cm2 for the reflective filter and 14 J/cm2 for the absorptive filter. In this case, the absorptive filter is the best choice in order to avoid optical damage.

Pulsed Microsecond Laser Example
Consider a laser system that produces 1 µs pulses, each containing 150 µJ of energy at a repetition rate of 50 kHz, resulting in a relatively high duty cycle of 5%. This system falls somewhere between the regimes of CW and pulsed laser induced damage, and could potentially damage an optic by mechanisms associated with either regime. As a result, both CW and pulsed LIDT values must be compared to the properties of the laser system to ensure safe operation.

If this relatively long-pulse laser emits a Gaussian 12.7 mm diameter beam (1/e2) at 980 nm, then the resulting output has a linear power density of 5.9 W/cm and an energy density of 1.2 x 10-4 J/cm2 per pulse. This can be compared to the LIDT values for a WPQ10E-980 polymer zero-order quarter-wave plate, which are 5 W/cm for CW radiation at 810 nm and 5 J/cm2 for a 10 ns pulse at 810 nm. As before, the CW LIDT of the optic scales linearly with the laser wavelength, resulting in an adjusted CW value of 6 W/cm at 980 nm. On the other hand, the pulsed LIDT scales with the square root of the laser wavelength and the square root of the pulse duration, resulting in an adjusted value of 55 J/cm2 for a 1 µs pulse at 980 nm. The pulsed LIDT of the optic is significantly greater than the energy density of the laser pulse, so individual pulses will not damage the wave plate. However, the large average linear power density of the laser system may cause thermal damage to the optic, much like a high-power CW beam.


Posted Comments:
Tariq Shamim Khwaja  (posted 2019-06-20 07:44:49.473)
Would it be possible to inform about the internal lenses in the beam expander so I may do an Gaussian ABCD analyses for the same? Zemax is more geared towards ray-optics. I would only require f1, f2, and lens separation (that, I understand, can be varied). Thank you.
YLohia  (posted 2019-06-20 09:35:15.0)
Hello, thank you for contacting Thorlabs. It is possible for you to determine the focal lengths of the lens groups with the Zemax "black box" model supplied. In order to get this information, you would have to delete one black box surface in order for you to be able to see the EFL for the other one. You would get the lens separation automatically once you have the focal length.On the actual device, the nominal distance can be varied by +/-5mm with the compensation ring.
brown171  (posted 2017-09-15 13:11:22.133)
Hello, I have used and enjoyed this product. For doing fine collimation without beam steering (into fibers etc), I think it would be useful to have a 1x magnification version of this product. I would also like the a AR coating range to contain 3x YAG at 355nm.
tfrisch  (posted 2017-09-26 03:07:06.0)
Hello, thank you for contacting Thorlabs. It sounds like you are referring to matched pairs of lenses for a 1:1 image relay. I will reach out to you directly to discuss your application. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1716
luqi  (posted 2017-01-10 08:47:10.89)
Hi. I'd like to know the transmission wavefront PV value of the GBE05-A under 632.8nm. In your Zemax file, PV=0.09λ@632.8nm, but after testing the GBE05-A beam expander we bought by a commercial interferometer, the transmission wavefront PV value is approximately 20λ@632.8nm. Is it your polishing error or alignment error that causes this result? Thanks.
tfrisch  (posted 2017-01-18 05:30:39.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly to troubleshoot the wavefront.
paul.huillery  (posted 2016-03-10 13:31:29.81)
Hi, I'm considering buying a beam expander (A-coated, 10X or 20X) for an imaging application. The zemax files you provide for those products correspond to the expander configuration but I would like to use it as a beam reducer. Would it be possible to get a zemax file corresponding to the reducer configuration ? Thanks a lot
besembeson  (posted 2016-03-11 10:40:00.0)
Response from Bweh at Thorlabs USA: I will share this with you by email.
marcel.brautzsch  (posted 2015-09-18 11:09:46.143)
Hi, I'm interested in the GBE02-A Beam Expander to use it for reducing a 532nm Nd:YAG pulse by 2x. Because backreflection is absolutely critical I want to know if the input lense (in my case the bigger one) is plane or concave/convex towards the laser.
besembeson  (posted 2015-10-05 02:06:32.0)
Response from Bweh at Thorlabs USA: We will contact you regarding this information.
yamaguchike  (posted 2014-12-02 14:21:16.517)
Please let me know to be able to customize wavelength coverage of AR coating. I need beam expander for 355nm(3rd harmonic of Nd:YAG).
jlow  (posted 2014-12-11 02:15:32.0)
Response from Jeremy at Thorlabs: We will contact you directly to discuss about the characteristic of your laser and the custom beam expander.
cohennc  (posted 2014-08-12 03:26:59.977)
no Damage threshold in it thanks
jlow  (posted 2014-08-21 01:07:55.0)
Response from Jeremy at Thorlabs: We do not have damage threshold data for these at the moment but our estimate is around 100W/cm^2.
nicolas.perlot  (posted 2014-07-20 12:33:58.843)
Hello Thorlabs, I'd like to know the specs (e.g. focal length) of the lenses contained in the beam expanders (in particular, BE20M) but couldn't find them on the web pages. There is a Zemax file to download, but what if one does not have Zemax?
myanakas  (posted 2014-07-23 08:55:19.0)
Response from Mike at Thorlabs: Thank you for your feedback. The BE20M is a Galilean Beam Expander with a positive doublet (EFL = 262.6 mm at 633 nm) and a plano-concave singlet (EFL = -13.4 mm at 633 nm). We have also contacted you directly. We are planning on updating the presentation of our beam expanders pages and will investigate having more information about the internal optics specified.
van.a.hodgkin.civ  (posted 2014-05-27 14:10:03.64)
How would I use one of the beam expanders to reduce the divergence of a laser beam by a factor of 2?
besembeson  (posted 2014-06-05 06:56:21.0)
A response from bweh E at Thorlabs Newton-USA: Thanks for contacting Thorlabs. By using a 2X beam expander, you will decrease the divergence by a factor of 2. So the BE02M series of expanders will be a good product to use. In general, expanding a beam "X"times reduces the divergence by the same factor.
bdada  (posted 2012-02-10 19:25:00.0)
Response from Buki at Thorlabs to omertzang: Thank you for your feedback on our variable beam expanders. Unfortunately, we don't have any specific data on the damage threshold for femtosecond pulsed light. We expect the beam expander to withstand 100 mJ/cm2 for a 10ns pulse but we cannot use this information to calculate the damage threshold for a femtosecond pulse due to different damage mechanisms.
doron.azoury  (posted 2012-02-09 05:25:52.0)
Can you please provide information regarding the damage threshold for pulsed laser. We use femtosecond 80MHz laser with energy of 10^-6 J/cm^2. Can these beam expanders hold this energy level?
bdada  (posted 2011-11-04 11:39:00.0)
Response from Buki at Thorlabs: Thank you for your interest in our beam expanders. We are considering the addition of a locking screw as a standard feature, but we are able to provide it as a custom for now. We have contacted you regarding the Zemax file. Please contact TechSupport@thorlabs.com if you have further questions.
james.parker  (posted 2011-11-02 13:36:48.0)
Hi, I'm interested in your range of beam expanders, mainly the BE02M for my current requirement. I would like to know the effect of wavelength change on the collimation. If you could please send me the Zemax file for this unit that would be great. A feature that I would like to see on these beam expanders is a locking screw for the adjustment. Best regards, James
bdada  (posted 2011-11-01 16:40:00.0)
Response from Buki at Thorlabs: Thank you for using our Feedback tool. It is possible to use the beam expanders in the reverse direction as a beam reducer. 2x or 3x reduction from 10mm would typically be ok. If the reduction is very large there could be issues with divergence and the damage threshold of the internal optics. We have contacted you to further discuss your application.
puje  (posted 2011-11-01 06:57:35.0)
Hello Thorlabs, can the beam expanders (Be series) be used also as beam reducers (i.e. "the other way around" so to speak) or are there problems associated with this? I have a 10-mm beam diameter that I would like to reduce by a factor of 2 or 3, and also have the option of fine-tuning the divergence of the smaller beam.
bdada  (posted 2011-09-22 19:33:00.0)
Response from Buki at Thorlabs: The input aperture, meaning the input opening, of the BE10M 10X beam expander is Ø4.5mm. On the other hand, we specify the 1/e^2 maximum input beam diameter to be 2.25mm for diffraction limited performance. This means that, as long as the input beam diameter is smaller than 2.25mm, the introduced wavefront distortion in a Gaussian beam will be less than ?/4. However, the nominal performance of the BE series of beam expanders is typically much better than this specification. Now going back to your question, if you use a 3mm beam, the expansion will still be about 10X but the performance would not be better than specified at the recommended beam diameter. Please refer to the "Wavefront Data" tab on the product page to see the values of the calculated beam distortion for our beam expanders at 2.25mm input beam diameter.
m9903104  (posted 2011-09-22 19:23:08.0)
Hi, Im interest in your product: Laser Expander BE10M but I have some questions: the spec says the aperture is 4.5(mm) and max input beam diameter is 2.25(mm) I was wondering if input beam diameter is 3(mm), will output beam diameter be 30(mm) ? Or maximun output beam only 22.5(mm) for 10x expansion?
jjurado  (posted 2011-02-10 14:09:00.0)
Response from Javier at Thorlabs to linzemu: Thank you very much for contacting us with your request. In Gaussian optics, the divergence angle is inversely correlated to the beam waist radius. If we only consider far field divergence (the divergence angle near the laser source is very small), this relationship is given by theta = lambda/(pi * r), where theta is the divergence angle, lambda is the wavelength of the source, and r is the beam waist radius. You can see then, as the radius of the beam waist increases, the divergence angle becomes smaller at the same rate. For example, the specified beam divergence of our HRR005 HeNe laser (0.5 mW, 0.6328 um) is specified as 1.41 mrad. After a 10X expansion, the divergence angle is then equal to (1/10)* 1.41 mrad, or 0.141 mrad.
tor  (posted 2011-01-05 09:57:24.0)
Response from Tor at Thorlabs to David: Thank you for your interest in our beam expanders. I will check to see if we are able to provide your requested files.
david.m.brown  (posted 2011-01-04 19:46:32.0)
BE05M-C, BE10M-C, BE15M-C Would it be possible to acquire the ZEMAX files for one or all of these? I buy a lot of things from thorlabs and it would be simply fantastic if I was able to have these files to make sure the instrument I am planning to build with these is going to work as expected.
apalmentier  (posted 2009-12-17 18:53:06.0)
A response from Adam at Thorlabs: Thank you for the notification, we are going to have our web team correct this as soon as possible. I will also see if we can provide the appropriate Zemax files you are looking for.
flickingerd  (posted 2009-12-17 17:11:45.0)
The links under the "Wavefront Data" tab seem to be broken. Im interested in the available information about part BE02M-B. If a ZEMAX file was available as well, that would be great to have.
apalmentieri  (posted 2008-08-01 14:25:28.0)
We should consider adding Zemax files for customers to download.
Laurie  (posted 2008-06-27 08:45:50.0)
Response from Laurie at Thorlabs to srubin: Thank you for your feedback. The input and output drawings are transposed on the .pdf document. We will fix this ASAP.
srubin  (posted 2008-06-26 22:54:07.0)
I think there is a mistake in the drawing of the BE20M. in the PDF file the output side is described to have a SM1 lens while the input as an SM2 thread.
technicalmarketing  (posted 2008-01-07 08:40:30.0)
Katherine, We do indeed have enough stock of the BE02M-A to complete your request for 2 of these. In addition, the BE02M-A 2X beam expanders #4-40 tap could be drilled larger if you have access to a mill. Alternatively, if you request a larger tap, it is also possible for us to drill the tap for you. The width of the ring on which that tap is drilled is about 5/8" (~7 mm), so there is some room to make the tap larger. Alternatively, I would recommend using one of our screw adapters. Theyre inexpensive and then you would always have the option of going back to the 4-40 tap should your needs change. You can find the adapters at the following link if you are interested: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=1745&visNavID=836 Specifically, you can change from a 4-40 external thread to 8-32 with part number AP8E4E, and then from 8-82, you can change to an external thread of M4 (Item# AS4M8E), 1/4-20 (Item# AS25E8E), or M6 (Item# AS6M8E) or to an internal thread of 1/4-20 (Item# AI25E8E) or M6 (Item# AI6M8E). If you would like to speak to someone about your specific application, we would invite you to call and speak to one of our applications engineers (973-579-7227). Thank you for your interest in our products, and I hope this information is helpful.
tung_katherine  (posted 2008-01-05 02:37:42.0)
I am interest in your BE02M-A production. But I have one question need to ask. Is it possible to extend #4-40 tapped Hole to 2 or 3 times bigger let us can mount it on our holder? If we want to buy 2 do you have them in stock? Please contact me A.S.A.P. Sincerely Katherine

Thorlabs offers several different families of beam expanders to meet various experimental needs. The table below provides a direct comparison of the options we offer. Please contact Tech Support if you would like help choosing the best beam expander for your specific application.

Beam Expander Description Fixed Magnification
Laser Line,
Sliding Lens
Fixed Magnification
Achromatic,
Sliding Lens
Fixed Magnification
Mid-Infrared,
Sliding Lens
Variable Magnification
Rotating Lens
Variable Magnification
Sliding Lens
Reflective Beam Expander
Fixed Magnification
Expansions Available 2X, 3X, 5X, 10X, 20Xa 2X, 3X, 5X, 10X, 15X, 20X 2X, 5X, 10X 2 - 5X
5 - 10X
0.5 - 2X 2X, 4X, 6X
AR Coating
Range(s) Available
240 - 360 nm (-UVB)
248 - 287 nm (-266)
325 - 380 nm (-355)
488 - 580 nm (-532)
960 - 1064 nm (-1064)
400 - 650 nm (-A)
650 - 1050 nm (-B)
1050 - 1650 nm (-C)
7 - 12 μm (-E3) 400 - 650 nm (-A)
650 - 1050 nm (-B)
1050 - 1620 nm (-C)
400 - 650 nm (-A)
650 - 1050 nm (-B)
N/A
Mirror Coating
(Range)
N/A Protected Silver
(450 nm - 20 μm)
Reflectance
(per Surface)
Ravg < 0.2%
(RMax < 1.5% for -UVB)
RMax < 0.5% Ravg < 1.0% Ravg < 0.5% Ravg < 0.5% Ravg > 96%
Max Input Beam
Diameter
2X: 8.5 mm
3X: 9.0 mm
5X: 4.3 mm
10X: 2.8 mm
20X: 2.0 mm
2X: 8.5 mm
3X: 9.0 mm
5X: 5.0 mm
10X: 3.0 mm
15X: 2.5 mm
20X: 2.0 mm
2X: 9.5 mm
5X: 6.7 mm
10X: 3.5 mm
2X to 5X: 4.0 mm
5X to 10X: 2.3 mm
0.5X: 6.0 mm
to
2X: 3.0 mm
3 mm
Wavefront Error <λ/4 (Peak to Valley) <λ/4 <λ/10b (RMS)
Surface Quality 10-5 Scratch-Dig 20-10 Scratch-Dig 80-50 Scratch-Dig 20-10 Scratch-Dig 40-20 Scratch-Dig
  • These 20X beam expanders are only available with V coatings for 355 nm, 532 nm, or 1064 nm.
  • For a Ø1.5 mm Input Beam at 2X magnification, Ø1.0 mm Input Beam at 4X magnification, or Ø0.5 mm Input Beam at 6X magnification.

Beam Expanders, AR Coated: 400 - 650 nm

Item #ExpansionMax Input
Beam Diameter
Diffraction-Limited Input
Beam Diametera
Input ThreadOutput Thread
(External)
AR Coating
Reflectance
Typical
Transmission
Damage
Thresholdb
GBE02-A 2X 9.7 mm 8.5 mm Internal: SM05
External: SM1
SM1 RMax <0.5%
for 400 - 650 nm
≥93% @ 405 nm
≥96% @ 543 nm
≥98% @ 633 nm
3 J/cm²
(532 nm, 10 Hz,
10 ns, Ø408 μm)
GBE03-A 3X 10.6 mm 9.0 mm M43 x 0.5c
GBE05-A 5X 7.0 mm 5.0 mm
GBE10-A 10X 3.5 mm 3.0 mm
GBE15-A 15X 2.9 mm 2.5 mm SM2
GBE20-A 20X 2.2 mm 2.0 mm
  • Maximum input beam diameter for output Peak-to-Valley Wavefront Error (WFE) <λ/4 at 633 nm.
  • This is the damage threshold of the AR Coating, which limits the power that the beam expander can accept. Note that if these items are being used to reduce the size of a beam, the power at the exit aperture must not exceed this damage threshold.
  • The SM2A30 thread adapter can be used to integrate these beam expanders with our SM2-Threaded Lens Tubes and 60 mm Cage Components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
GBE02-A Support Documentation
GBE02-A2X Achromatic Galilean Beam Expander, AR Coated: 400 - 650 nm
$423.39
Today
GBE03-A Support Documentation
GBE03-A3X Achromatic Galilean Beam Expander, AR Coated: 400 - 650 nm
$509.54
Today
GBE05-A Support Documentation
GBE05-A5X Achromatic Galilean Beam Expander, AR Coated: 400 - 650 nm
$520.05
Today
GBE10-A Support Documentation
GBE10-A10X Achromatic Galilean Beam Expander, AR Coated: 400 - 650 nm
$584.13
Today
GBE15-A Support Documentation
GBE15-A15X Achromatic Galilean Beam Expander, AR Coated: 400 - 650 nm
$637.71
Today
GBE20-A Support Documentation
GBE20-A20X Achromatic Galilean Beam Expander, AR Coated: 400 - 650 nm
$691.29
Today

Beam Expanders, AR Coated: 650 - 1050 nm

Item #ExpansionMax Input
Beam Diameter
Diffraction-Limited Input
Beam Diametera
Input ThreadOutput Thread
(External)
AR Coating
Reflectance
Typical
Transmission
Damage
Thresholdb
GBE02-B 2X 9.7 mm 8.5 mm Internal: SM05
External: SM1
SM1 RMax <0.5%
for 650 - 1050 nm
≥96% @ 780 nm
≥96% @ 980 nm
7.5 J/cm² (810 nm,
10 Hz, 10 ns,
Ø76.9 μm)
GBE03-B 3X 10.6 mm 9.0 mm M43 x 0.5c
GBE05-B 5X 7.0 mm 5.0 mm
GBE10-B 10X 3.5 mm 3.0 mm
GBE15-B 15X 2.9 mm 2.5 mm SM2
GBE20-B 20X 2.2 mm 2.0 mm
  • Maximum input beam diameter for output Peak-to-Valley Wavefront Error (WFE) <λ/4 at 633 nm.
  • This is the damage threshold of the AR Coating, which limits the power that the beam expander can accept. Note that if these items are being used to reduce the size of a beam, the power at the exit aperture must not exceed this damage threshold.
  • The SM2A30 thread adapter can be used to integrate these beam expanders with our SM2-Threaded Lens Tubes and 60 mm Cage Components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
GBE02-B Support Documentation
GBE02-B2X Achromatic Galilean Beam Expander, AR Coated: 650 - 1050 nm
$423.39
Today
GBE03-B Support Documentation
GBE03-B3X Achromatic Galilean Beam Expander, AR Coated: 650 - 1050 nm
$509.54
Today
GBE05-B Support Documentation
GBE05-B5X Achromatic Galilean Beam Expander, AR Coated: 650 - 1050 nm
$520.05
Today
GBE10-B Support Documentation
GBE10-B10X Achromatic Galilean Beam Expander, AR Coated: 650 - 1050 nm
$584.13
Today
GBE15-B Support Documentation
GBE15-B15X Achromatic Galilean Beam Expander, AR Coated: 650 - 1050 nm
$637.71
Today
GBE20-B Support Documentation
GBE20-B20X Achromatic Galilean Beam Expander, AR Coated: 650 - 1050 nm
$691.29
Today

Beam Expanders, AR Coated: 1050 - 1650 nm

Item #ExpansionMax Input
Beam Diameter
Diffraction-Limited Input
Beam Diametera
Input ThreadOutput Thread
(External)
AR Coating
Reflectance
Typical
Transmission
Damage
Thresholdb
GBE02-C 2X 9.7 mm 8.5 mm Internal: SM05
External: SM1
SM1 RMax <0.5%
for 1050 - 1650 nm
≥96% @ 1064 nm
≥97% @ 1310 nm
≥97% @ 1550 nm
3 J/cm² (1542 nm,
10 ns Pulse, 1 Hz,
Ø268 µm)
GBE03-C 3X 10.6 mm 9.0 mm M43 x 0.5c
GBE05-C 5X 7.0 mm 5.0 mm
GBE10-C 10X 3.5 mm 3.0 mm
GBE15-C 15X 2.9 mm 2.5 mm SM2
GBE20-C 20X 2.2 mm 2.0 mm
  • Maximum input beam diameter for output Peak-to-Valley Wavefront Error (WFE) <λ/4 at 633 nm.
  • This is the damage threshold of the AR Coating, which limits the power that the beam expander can accept. Note that if these items are being used to reduce the size of a beam, the power at the exit aperture must not exceed this damage threshold.
  • The SM2A30 thread adapter can be used to integrate these beam expanders with our SM2-Threaded Lens Tubes and 60 mm Cage Components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
GBE02-C Support Documentation
GBE02-C2X Achromatic Galilean Beam Expander, AR Coated: 1050 - 1650 nm
$423.39
Today
GBE03-C Support Documentation
GBE03-C3X Achromatic Galilean Beam Expander, AR Coated: 1050 - 1650 nm
$509.54
Today
GBE05-C Support Documentation
GBE05-C5X Achromatic Galilean Beam Expander, AR Coated: 1050 - 1650 nm
$520.05
Today
GBE10-C Support Documentation
GBE10-C10X Achromatic Galilean Beam Expander, AR Coated: 1050 - 1650 nm
$584.13
Today
GBE15-C Support Documentation
GBE15-C15X Achromatic Galilean Beam Expander, AR Coated: 1050 - 1650 nm
$637.71
Today
GBE20-C Support Documentation
GBE20-C20X Achromatic Galilean Beam Expander, AR Coated: 1050 - 1650 nm
$691.29
Today

Mounting Accessories

The mounting surfaces of Thorlabs' Achromatic Beam Expanders share the same Ø1.2" or Ø2.2" diameter as our SM1-Threaded and SM2-Threaded Lens Tubes. Several mounting options listed with compatible beam expanders are provided for convenience in the table below.

Item #SM1RC(/M)SM2RC(/M)SM1TCSM2TCCP12LCP09SM2A21SM2A30SM1A52
Photo
(Click to Enlarge)
SM1RC SM1TC CP12 SM2A21 SM2A30 SM1A52
Application Slip Ring
for Post Mounting
Ø1.2" Housing
Slip Ring
for Post
Mounting
Ø2.2" Housing
Clamp
for Post Mounting
Ø1.2" Housing
Clamp
for Post Mounting
Ø2.2" Housing
30 mm Cage
Mounting for
Ø1.2" Housing
60 mm Cage
Mounting for
Ø2.2" Housing
Mount Beam
Expander in
Ø2" or SM2-Threaded
Optic Mounts
Integrate Beam
Expander with
SM2-Threaded
Components
Integrate Beam
Expander with
M30 x 1.0-Threaded
Components
Compatible
Beam Expanders
GBE02
GBE03
GBE05
GBE10
GBE15
GBE20
GBE02
GBE03
GBE05
GBE10
GBE15
GBE20
GBE02
GBE03a
GBE05a
GBE10a
GBE15
GBE20
GBE02
GBE03
GBE05
GBE10
GBE03
GBE05
GBE10
GBE02
GBE03
GBE05
GBE10
GBE15
GBE20
Taps / Through Holes 8-32 (M4)
Tap for
Post
Mounting
8-32 (M4)
Tap for
Post Mounting
#8 (M4)
Counterbore for Post
Mounting
#8 (M4)
Counterbore
for Post
Mounting
4 Through
Holes for ER
Cage Rods
4 Through
Holes for ER
Cage Rods
- - -
Internal Threads / Bore Ø1.2" Bore Ø2.2" Bore Ø1.2" Bore Ø2.2" Bore Ø1/2" Bore Ø2.2" Bore Ø1.2" Bore M43 x 0.5
Threads
SM1
Threads
External Threads / 
Outer Diameter
- - - - - - SM2 Threads and
Ø2" Smooth Surface
SM2 Threads M30 x 1.0
Threads
  • The output of these beam expanders is Ø45.0 mm and will not fit inside of a 30 mm cage system. The CP12 can be used to mount these beam expanders if they are being used at the termination of a section of cage system, i.e., the cage rods only extend over the Ø1.2" section of the housing. If the entire beam expander needs to be enclosed in the cage system, the SM2A21 adapter can be mounted in an LCP09 cage plate for integration into a 60 mm cage system.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
SM1RC Support Documentation
SM1RCØ1.20" (Ø30.6 mm) Slip Ring for SM1 Lens Tubes and C-Mount Extension Tubes,
8-32 Tap
$24.37
Today
SM2RC Support Documentation
SM2RCØ2.20" (Ø56.0 mm) Slip Ring for SM2 Lens Tubes, 8-32 Tap
$30.99
Today
+1 Qty Docs Part Number - Universal Price Available
SM1TC Support Documentation
SM1TCØ1.20" (Ø30.7 mm) Clamp for SM1 Lens Tubes and C-Mount Extension Tubes
$44.39
Today
SM2TC Support Documentation
SM2TCØ2.20" (Ø55.9 mm) Clamp for SM2 Lens Tubes
$47.54
Today
CP12 Support Documentation
CP12Customer Inspired! 30 mm Cage Plate, Ø1.2" Double Bore for SM1 and C-Mount Lens Tubes
$21.43
Today
LCP09 Support Documentation
LCP09Customer Inspired!  60 mm Cage Plate with Ø2.2" (Ø56.0 mm) Double Bore for SM2 Lens Tube Mounting
$44.39
Today
SM2A21 Support Documentation
SM2A21Externally SM2-Threaded Mounting Adapter with Ø1.20" (Ø30.5 mm) Bore and 2" Outer Diameter
$47.54
Today
SM1A52 Support Documentation
SM1A52Adapter with External M30 x 1.0 Threads and Internal SM1 Threads
$16.08
Today
SM2A30 Support Documentation
SM2A30Adapter with External SM2 Threads and Internal M43 x 0.5 Threads
$16.08
Today
+1 Qty Docs Part Number - Metric Price Available
SM1RC/M Support Documentation
SM1RC/MØ1.20" (Ø30.6 mm) Slip Ring for SM1 Lens Tubes and C-Mount Extension Tubes,
M4 Tap
$24.37
Today
SM2RC/M Support Documentation
SM2RC/MØ2.20" (Ø56.0 mm) Slip Ring for SM2 Lens Tubes, M4 Tap
$30.99
Today
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