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Reflective Collimators, Protected Silver Coating


  • Achromatic Collimator/Coupler
  • Protected Silver Reflective Coating
  • Ø2 mm, Ø4 mm, Ø8.5 mm, or Ø12 mm Collimated Beam
  • FC/PC, FC/APC, or SMA Connector

RC12SMA-P01

Ø12 mm Beam

RC08APC-P01

Ø8.5 mm Beam

RC04FC-P01

Ø4 mm Beam

RC02FC-P01

Ø2 mm Beam

RC08APC-P01

Reflective Collimator
with Patch Cord
Shown Mounted
to a Ø1/2" Post

Related Items


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Key Specificationsa
Item # Prefix RC02 RC04 RC08 RC12
Collimated Beam
(0.13 NA Fiber)
Ø2 mm Ø4 mm Ø8.5 mm Ø12 mm
Numerical Aperture (NA) 0.40 0.36 0.167 0.216
Reflected Focal Length (RFL) 7 mm 15 mm 33 mm 50.8 mm
External Threading of Housing  SM05 (0.535"-40) SM1 (1.035"-40)
Clear Aperture Ø7.5 mm Ø11 mm Ø22 mm
Reflectance (Avg.) >97.5% (450 nm - 2 μm)
>96% (2 - 20 μm)
  • Please see the Specs tab for more information.
Monting the RC02 into an Optical Mount
Click to Enlarge

The left image shows an RC02 collimator mounted into a KM05 Ø1/2" kinematic mount and the right image shows the RC02 mounted into a POLARIS-K1 Ø1" kinematic mount. Both kinematic mounts can be used to align the beam for fiber coupling.
Reflective Collimator Cross SectionCollimating Light from an Optical Fiber
(Can also be Used in Reverse)

Features

  • Achromatic Design for Collimation Over the Mirror's Reflection Band
  • Protected Silver Coating (450 nm - 20 µm) Offers High Reflection
  • Great for Coupling Polychromatic Light into Multimode Fiber
  • Surface Roughness: <100 Å (RMS)
  • Ø7.5 mm, Ø11 mm, or Ø22 mm Clear Aperture
  • Nonmagnetic Stainless Steel Housing

These Protected Silver Reflective Collimators are based on a 90° off-axis parabolic mirror. Metallic mirrors, unlike lenses, have a focal length that remains constant over a broad wavelength range. Due to this intrinsic property, a parabolic mirror collimator does not need to be adjusted to accommodate various wavelengths of light, making them ideal for use with polychromatic light. The limitations of the achievable surface roughness of the diamond turning process and tooling marks will cause a minimal (~2% @ 633 nm) amount of scattering off of the mirrored surface. Common applications include systems that utilize multiple wavelengths that need to be collimated, collimation/coupling in the IR, and coupling polychromatic light into large-core multimode fiber.

These Protected Silver Reflective Collimators offer excellent reflectivity within the 450 nm - 20 µm wavelength range; please see the Specs tab for more information. In multiple-wavelength systems operating in the visible and IR, these reflective collimators can be used to both couple polychromatic collimated light into large-core multimode fiber and to collimate polychromatic light emitted by optical fibers. Note that, in general, light from a multimode fiber cannot be well collimated. When collimating light from a multimode patch cable, the fiber NA should be <0.40 (RC02), <0.36 (RC04), <0.167 (RC08), or <0.216 (RC12) to avoid clipping light on the housing. For more information on how to optimize coupling of light from an optical fiber, please see the Collimation Tutorial tab

The RC02, RC04, and RC08 reflective collimator housings are equipped with external SM05 (0.535"-40) threads while the RC12 collimator housing has external SM1 (1.035"-40) threads. Thus, these mounts are directly compatible with our SM05- or SM1-threaded optomechanics such as the LMR05 or LMR1, respectively. The back of the RC02 collimators are machined down to Ø1/2", enabling direct mounting into a Ø1/2" kinematic mount (see image to the right). Furthermore, the RC02, RC04, and RC08 may be directly mounted to Ø1" kinematic mounts by removing the knurled ring on the front of the housing and rethreading it over the back lip of the Ø1" counterbore using an SPW909 Spanner Wrench or an SPW801 Adjustable Spanner Wrench. The collimator can then be secured by tightening the mount's setscrew. The completed setup is shown in the image to the right.

Thorlabs also offers a line of UV-Enhanced Aluminum Coating Reflective Collimators for the 250 - 450 nm wavelength range.

Fiber Patch Cables for Reflective Collimators
Thorlabs offers single mode, polarization-maintaining, or multimode fiber optic patch cables for both coupling and collimating applications. We also have Low-Insertion-Loss Patch Cables, which feature handpicked single mode fiber with tighter core concentricity specifications for lower insertion loss and higher transmission. If you cannot find the appropriate stock patch cable for your application, custom-connectorized patch cables with same-day shipping are also available.

Protected Silver at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Silver
Common Specifications
Coating Protected Silver
Wavelength Range 450 nm - 20 µm
Reflectance (Avg) >97.5% (0.45 - 2 µm)
>96% (2 - 20 µm)
Surface Quality 40-20 Scratch-Dig
Surface Roughness <100 Å RMS
Reflected Wavefront Error
λ/4 at 633 nm
Full Angle Beam Divergencea 0.02°
Pointing Errorb
(FC/PC- and FC/APC-Connectorized Models)
<10 mrad
  • Approximate beam divergence. Divergence is based on the MFD of the fiber. 0.02° was achieved using S460-HP fiber at 543 nm.
  • Pointing error is not guaranteed for the SMA connectors due to the metal ferrule.
Item # Fiber Connectora Clear Aperture Beam Diameterb Mirror NA EFLc PFLd
RC02FC-P01 FC/PC Ø7.5 mm 2 mm 0.40 7 mm 3.5 mm
RC04FC-P01 Ø11 mm 4 mm 0.36 15 mm 7.5 mm
RC08FC-P01 Ø11 mm 8.5 mm 0.167 33 mm 16.5 mm
RC12FC-P01 Ø22 mm 12 mm 0.216 50.8 mm 25.4 mm
RC02APC-P01 FC/APC Ø7.5 mm 2 mm 0.40 7 mm 3.5 mm
RC04APC-P01 Ø11 mm 4 mm 0.36 15 mm 7.5 mm
RC08APC-P01 Ø11 mm 8.5 mm 0.167 33 mm 16.5 mm
RC12APC-P01 Ø22 mm 12 mm 0.216 50.8 mm 25.4 mm
RC02SMA-P01 SMA Ø7.5 mm 2 mm 0.40 7 mm 3.5 mm
RC04SMA-P01 Ø11 mm 4 mm 0.36 15 mm 7.5 mm
RC08SMA-P01 Ø11 mm 8.5 mm 0.167 33 mm 16.5 mm
RC12SMA-P01 Ø22 mm 12 mm 0.216 50.8 mm 25.4 mm
  • FC/PC and FC/APC versions use wide key connectors.
  • Approximate, based on 0.13 NA fiber
  • Effective Focal Length
  • Parent Focal Length: Off-axis parabolic mirrors can be made individually or cut from an on-axis parent parabolic mirror. When an off-axis parabolic mirror is cut from a parent on-axis parabolic mirror, we have a parent focal length (PFL) spec that arises. The PFL is the EFL of the parent mirror. Note that the EFL specified in the table above is that of the off-axis parabolic mirror. See the drawing to the right for more information.

Click to Enlarge
High-NA Fiber: The red line indicates the envelope of the beam that is clipped by the collimator housing. The dashed green line shows the portion of the beam that is collimated by the OAP mirror.

Click to Enlarge
Low-NA Fiber: The green line indicates the envelope of the beam as it diverges and is collimated by the OAP mirror.

Selecting a Collimator Based on Desired Output Beam Diameter

When using a reflective fiber collimator to collimate light from a fiber patch cable, selection of the appropriate mirror is often done based on the desired output beam diameter and the numerical aperture (NA) of the fiber. The fiber NA determines the divergence of the light emitted by the fiber prior to being collimated by the off-axis parabolic (OAP) mirror in the reflective collimator. The fiber NA is related to the divergence half angle of the fiber by the relationship:

where θ is the divergence half angle, assuming the surrounding medium is air (n = 1). The collimated beam diameter that results from a diverging light source incident on an OAP mirror is related to the reflected focal length (RFL) of the OAP and the fiber NA; it can be determined using the following equation using the small angle approximation:

where d is the beam diameter. Depending on how the NA of the fiber is specified, the above equation may result in a beam diameter specified at the 5% or 1% level rather than the 1/e2 level. The theoretical divergence of the collimated beam can be calculated using the following equation:

where θc is the divergence angle of the beam after collimation. Because of the relatively low divergence after collimation, these reflective collimators are ideal for collimating the output from low-NA, single mode fiber patch cables. 

Although the beam can theoretically be expanded to a given beam diameter, there are two major limitations on collimation with multimode fibers. The large divergence angle of most multimode fibers (e.g., NA = 0.22, 0.39, or 0.50) will cause light to be clipped by the collimator housing before it reaches the OAP mirror (as shown in the image to the right). Therefore, when collimating light from a multimode patch cable, the fiber NA should be <0.40 (RC02), <0.36 (RC04), <0.167 (RC08), or <0.216 (RC12) to avoid clipping light on the housing. The divergence angle is also slightly affected by the fiber core diameter; the maximum NA allowed will decrease slightly as the core diameter increases. If the beam diameter is larger than the clear aperture of the reflective collimator, then the output beam will be clipped by the collimator housing. Both scenarios may result in reduced quality of the output beam.

The table below lists the output beam diameter as a function of the reflected focal length of the mirror and the NA aperture of common single mode and multimode fibers.

Calculated Beam Diameter for Given Fiber NA and RFL
Fiber NA 0.13 NA, Single Mode 0.22 NA, Multimode 0.39 NA, Multimode
7 mm RFL (Item # Prefix RC02) 1.8 mm 3.1 mm 5.5 mm
15 mm RFL (Item # Prefix RC04) 3.9 mm 6.6 mm 11.7 mma
33 mm RFL (Item # Prefix RC08) 8.6 mm 14.5 mma,b 25.7 mma,b
50.8 mm RFL (Item # Prefix RC12) 13.2 mm 22.4 mma,b 39.6 mma,b
  • Due to the large NA of these fibers, the output beam will be clipped by the collimator housing.
  • These output beam diameters are larger than the clear aperture of the reflective collimator.

Fiber Collimator Selection Guide

Click on the collimator type or photo to view more information about each type of collimator.

Type   Description
Fixed FC, APC, or SMA Fiber Collimators Fixed SMA Fiber Collimator These fiber collimation packages are pre-aligned to collimate light from an FC/PC-, FC/APC-, or SMA-terminated fiber. Each collimation package is factory aligned to provide diffraction-limited performance for wavelengths ranging from 405 nm to 4.55 µm. Although it is possible to use the collimator at detuned wavelengths, they will only perform optimally at the design wavelength due to chromatic aberration, which causes the effective focal length of the aspheric lens to have a wavelength dependence.
Air-Spaced Doublet, Large Beam Collimators Air-Spaced Doublet Fiber Collimator For large beam diameters (Ø5.3 - Ø8.5 mm), Thorlabs offers FC/APC, FC/PC, and SMA air-spaced doublet collimators. These collimation packages are pre-aligned at the factory to collimate a laser beam propagating from the tip of an FC or SMA-terminated fiber and provide diffraction-limited performance at the design wavelength.
Triplet Collimators Triplet Fiber Collimator Thorlabs' High Quality Triplet Fiber Collimation packages use air-spaced triplet lenses that offer superior beam quality performance when compared to aspheric lens collimators. The benefits of the low-aberration triplet design include an M2 term closer to 1 (Gaussian), less divergence, and less wavefront error.
Achromatic Collimators for Multimode Fiber Triplet Fiber Collimator Thorlabs' High-NA Achromatic Collimators pair a meniscus lens with an achromatic doublet for high performance across the visible spectrum with low spherical aberration. Designed for use with high-NA multimode fiber, these collimators are ideal for Optogenetics and Fiber Photometry applications.
Reflective Collimators Reflective Fiber Collimator Thorlabs' metallic-coated Reflective Collimators are based on a 90° off-axis parabolic mirror. Mirrors, unlike lenses, have a focal length that remains constant over a broad wavelength range. Due to this intrinsic property, a parabolic mirror collimator does not need to be adjusted to accommodate various wavelengths of light, making them ideal for use with polychromatic light. Our reflective collimators are ideal for single-mode fiber.
FiberPorts Fiberport Fiber Collimator These compact, ultra-stable FiberPort micropositioners provide an easy-to-use, stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated optical fibers. It can be used with single mode, multimode, or PM fibers and can be mounted onto a post, stage, platform, or laser. The built-in aspheric or achromatic lens is available with five different AR coatings and has five degrees of alignment adjustment (3 translational and 2 pitch). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.
Adjustable Fiber Collimators Adjustable Fiber Collimator These collimators are designed to connect onto the end of an FC/PC or FC/APC connector and contain an AR-coated aspheric lens. The distance between the aspheric lens and the tip of the FC-terminated fiber can be adjusted to compensate for focal length changes or to recollimate the beam at the wavelength and distance of interest.
Large Beam Fiber Collimators large beam collimators Thorlabs' Large-Beam Fiber Collimators are designed with an effective focal length (EFL) of 40 mm or 80 mm, have optical elements broadband AR coated for one of three wavelength ranges, and are available with FC/PC, FC/APC, or SMA905 connectors. A four-element, air-spaced lens design produces superior beam quality (M2 close to 1) and less wavefront error when compared to aspheric lens collimators. As a result, these collimators are very flexible; they can be used as free-space collimators or couplers. They may also be used over a long distance in pairs, which allows the free-space beam to be manipulated prior to entering the second collimator and may be useful in long-distance communications applications.
Zoom Fiber Collimators Zoom Fiber Collimator These collimators provide a variable focal length between 6 and 18 mm, while maintaining the collimation of the beam. As a result, the size of the beam can be changed without altering the collimation. This universal device saves time previously spent searching for the best suited fixed fiber collimator and has a very broad range of applications. They are offered with FC/PC, FC/APC, or SMA905 connectors with three different antireflection wavelength ranges to choose from.
Single Mode Pigtailed Collimators Pigtailed Fiber Collimator Our single mode pigtailed collimators come with one meter of fiber, consist of an AR-coated aspheric lens pre-aligned with respect to a fiber, and are collimated at one of eight wavelengths: 532 nm, 633 nm, 780 nm, 850 nm, 1030 nm, 1064 nm, 1310 nm, or 1550 nm. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength.
Polarization Maintaining Pigtailed Collimators Our polarization maintaining pigtailed collimators come with one meter of fiber, consist of an AR-coated aspheric lens pre-aligned with respect to a fiber, and are collimated at one of six wavelengths: 532 nm, 830 nm, 1030 nm, 1064 nm, 1310 nm, or 1550 nm. Custom wavelengths and connectors are available as well. A line is engraved along the outside of the housing that is parallel to the slow axis. As such, it can be used as a reference when polarized light is launched accordingly. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength.
GRIN Fiber Collimators GRIN Fiber Collimator Thorlabs offers gradient index (GRIN) fiber collimators that are aligned at a variety of wavelengths from 630 to 1550 nm and have either FC terminated, APC terminated, or unterminated fibers. Our GRIN collimators feature a Ø1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard single mode or graded-index multimode fibers.
GRIN Lenses GRIN Lens These graded-index (GRIN) lenses are AR coated for applications at 630, 830, 1060, 1300, or 1560 nm that require light to propagate through one fiber, then through a free-space optical system, and finally back into another fiber. They are also useful for coupling light from laser diodes into fibers, coupling the output of a fiber into a detector, or collimating laser light. Our GRIN lenses are designed to be used with our Pigtailed Glass Ferrules and GRIN/Ferrule sleeves.

Posted Comments:
Arthur van Wijk  (posted 2019-10-30 09:23:27.96)
We were advised to use a RC04 to refocus a collimated beam (simply the reverse of collimating). Unfortunately this does not work. It seems that the spotsize is too big. It doesn't even work with MM fibers. My guess is that this demands a very high beam quality, or is there something else at play? Using a single molded aspheric lens works much better! Of course you need to mount the fiber on a XYZ stage with high precision micrometers, but we now have less absorption than with the objective we used before. We'll keep the RC04FC for whenever we need a collimator.
mdiekmann  (posted 2019-11-06 02:07:52.0)
Thank you for contacting Thorlabs! In order to optimize the incoupling into a reflective collimator, the collimator should be mounted into a tip/tilt plate.
Jan Kaster  (posted 2019-09-11 07:54:47.517)
Hi there, I am thinking about using these for a stray light measuring setup, where a extraordinarily clean beam is required (2% at 633nm is already a bit rough). Would it be possible to achieve a better surface roughness (e.g. 1nm or at least 5nm) and quality (e.g. 10/5 or at least 20/10)? Would it be possible to apply a black coating on the inner tubes, e.g. Acktar Magic Black, to reduce stray light from the fiber? Thanks and kind regards, Jan
wskopalik  (posted 2019-09-18 06:30:28.0)
Thank you for contacting Thorlabs. Unfortunately, we cannot offer higher specifications on Surface Roughness and Surface Quality at this time, but it is certainly possible to apply black coating on the inner tubes as a custom option. We will contact you directly in this matter.
mikael.malmstrom  (posted 2019-01-15 06:56:43.54)
I would like to have a 2" reflective (high NA) collimator fibrecoupled for collecting scattered light, with a center hole for illumination also with a fiber coupled reflective collimator (Low NA). Would anyone else like such a thing?
nbayconich  (posted 2019-01-21 09:10:31.0)
At the moment we cannot provide 2" diameter reflective collimator packages however we can provide customized OAP mirrors to be used for similar applications. The simplest solution would be to use a stock OAP mirror from our catalog along with some of our catalog mirror mounts and terminated fiber adapters located in the links below. OAP mirrors with through holes https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_id=7197 Right angle OAP mounts https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_ID=11097 Termintated fiber adapters https://www.thorlabs.us/newgrouppage9.cfm?objectgroup_id=69
CMac  (posted 2018-12-19 10:42:19.247)
In the collimation tutorial, the quoted beam diameters are measured to 1/e2, is that correct?
YLohia  (posted 2018-12-21 10:00:09.0)
Hello, the listed values in the 'Collimation Tutorial' tab are calculated from the equation d = 2 x NA x RFL, so the diameter's definition will depend on the definition of NA for the fiber being used. The NA is based off a geometrical angle, and is for the 5% fall-off point from the peak intensity at the center of the beam.
kwu  (posted 2018-11-12 20:37:20.347)
I have a single mode 0.22 NA SMA fiber. and I want to let the output beam size as small as possible. Should I select RC02SMA-P01? Or RC12SMA-P01(for NA purpose)? Thank you.
YLohia  (posted 2018-11-13 09:25:02.0)
Hello, thank you for contacting Thorlabs. In this case, the RC02SMA-P01 would be most suitable for a small beam diameter as it has a higher NA than your fiber and a shorter focal length than the other collimators in this product line.
kullock  (posted 2018-09-26 09:53:10.657)
We would like to use one of the reflective collimators (probably RC08FC-P01) to couple out light from a photonic crystal (PC) fiber. The issue with PC fibers is that as the last hundred of micrometers are sealed (to prevent water from penetrating the holes) the light already starts to diverge there and, hence, the effective focus is not at the end facet but shifted into the fiber. So, the collimators cannot deliver collimated light for PC fibers (we tested it with the RC02SMA-P01 & RC04SMA-P01 variants). Would it be possible to have an adjustable fiber position to compensate for that? (This sounds at least tricky as the precisions probably has to be much below 10µm.)
nbayconich  (posted 2018-10-01 09:06:28.0)
Thank you for contacting Thorlabs. We do not have plans to release an adjustable focus version of the reflective collimator packages at the moment, we can however provide a version of these collimators where the fiber connector bulkhead will not be fixed/glued to the collimator housing allowing the position to be adjusted. I will reach out to you with more information.
user  (posted 2018-09-06 13:16:00.447)
What is the damage threshold of these products?
nbayconich  (posted 2018-09-06 03:25:55.0)
Thank you for contacting Thorlabs. We use the same metallic coatings for these reflective collimators as in the Off axis parabolic mirrors located in the link below. https://www.thorlabs.com/navigation.cfm?guide_id=2313 The same damage thresholds for these types of coatings on the OAP product page can be used for the reflective collimators, for example the LIDT for the -P01 silver coating will be 3 j/cm^2 @ (1064 nm, 10 ns, 10 Hz, Ø1.000 mm) for pulsed and 1750 W/cm @ (1.064 µm, Ø0.044 mm) & 1500 W/cm @ (10.6 µm, Ø0.339 mm) for CW. This is safe to use when collimating a fiber source. However your input power limitation when coupling into fiber using the reflective collimator will be limited by the epoxy of the fiber connectors. 300mW is our general rule of thumb for power coupling in to a connectorized fiber.
s.grandi  (posted 2018-08-02 18:27:07.667)
Hi, I am using a RC08APC to couple light from a coherent light source into a 1064nm PM fibre (also Thorlabs). However, I am struggling to get past 10% coupling. The mode of the incoming beam is nice and gaussian, and I can achieve up to 70% coupling with a lens. Do you have any advice on this issue? Thanks
YLohia  (posted 2018-08-09 03:19:52.0)
Hello, thank you for contacting Thorlabs. There are several factors that can impact the coupling efficiency. For example: - the input beam diameter and its wavelength - the collimation level of the input beam - connector type of the fiber being used. Is it FC/PC connectorized or is it FC/APC? - the type of mount being used. Based on our discussion, the KM100 you are using is not good enough for high efficiency single mode fiber coupling since it only offers tip and tilt adjustment. You will need z and y axis adjustment in addition to that. - it is also possible that the mirror is dirty and can require some cleaning
jyryu1  (posted 2018-02-26 23:11:27.737)
[Customer inspired version of RC02FC-P01) I am wondering if we could have SM2 compatible Reflective Collimators, Protected Silver Coating with final beam diameter of 20~25mm (which would fit into POLARIS-K2S2P).In case of laser we have, we have beam divergence of 220 mrad(PC type). it means 51 mm X 2 X NA ~ 11 mm will be the final beam diameter. Will it be possible? how long will it take? Sincerely Ji young, RYu
llamb  (posted 2018-03-13 09:02:08.0)
Hello, thank you for contacting Thorlabs. We should be able to offer a custom collimator, though it will likely have a long lead time that depends on the desired quantity and exact specifications. I will reach out to you directly to discuss this further.
niccolo.daddi.ext  (posted 2017-10-24 15:45:30.69)
I have the following fiber: FC fiber I/F, 600um core, 0.22 NA I need first to collimate it and then, in a second stage of my setup, to take the collimated beam and focalize it into another optic fiber. Could you please help me in the selection of the right collimator? Thank you.
nbayconich  (posted 2017-11-20 11:18:01.0)
Thank you for contacting Thorlabs. When using a multimode source we recommend using a collimator with the longest focal length as possible for your application to reduce divergence. Assuming you are coupling back into another fiber with a 600µm core diameter you should use two of the same type collimator with equal focal lengths for collimating and coupling. I will contact you directly to help you find the best solution for your application.
lebouquj  (posted 2017-10-03 14:45:17.477)
After building reflective collimators for years, we are very pleased to see this product!! Is there any plan for even larger beams (say diameter 20mm) ? Thanks
nbayconich  (posted 2017-10-05 09:55:59.0)
Thank you for contacting Thorlabs. We have provided reflective collimators with EFL's up to 101.6mm and can provide custom reflective collimators upon request. We have recently seen demand for longer focal length collimators so there may be a possibility of releasing stock versions in the future. I will contact you directly with more information.
kjm2  (posted 2017-08-31 18:43:43.617)
Hi there, I am currently using the RC02APC-P01 to collimate a 3 mm diameter laser beam into your SM fibre P3-23Z-FC-2 with NA 0.19 and a 9 um core. I am also using them to collimate the light from the fibre and send it to a detector. We will be ordering some fibres from another manufacturer with NA 0.23 and a 6.5 um core. Should I be using a reflective collimator with a better matched NA such as the RC04 or even RC12?
tfrisch  (posted 2017-09-14 04:55:07.0)
Hello, thank you for contacting Thorlabs. Typically, a collimating optic is selected to achieve a given collimated beam diameter. Beam diameter is roughly 2*NA*RFL for a reflective collimator. I will reach out to you directly about your application.
nisanns  (posted 2017-04-24 15:15:43.593)
when using the RC04SMA-P01 to collimate the output of a MM fiber, the collimated beam diameter in the provided table is listed as being from a 0.13 NA fiber. how does that scale if using a 0.39 NA fiber? is it linear with NA (maybe 2*effective focal length*fiber NA)? can you provide the method used to calculate the beam diameter? thanks much
tfrisch  (posted 2017-05-02 11:14:44.0)
Hello, thank you for contacting Thorlabs. The relationship is trigonometric, but that is often approximated as linear for small angles. the NA defines the divergence angle; NA=n*sin(theta) where n=1 for air. Theta is the half angle of divergence, RFL is the adjacent side, and you can solve for the opposite side length of a right triangle which is half of the beam diameter. I will reach out to you directly to discuss further.
christoph.kratz  (posted 2017-03-07 01:49:03.59)
I would like to couple a MIR source (5-10µm) into a fiber. Therefore I am interested in what kind of coating is used for silver protection? Is there an uncoated alternative like alluminium or gold for the surface of the mirror?
tfrisch  (posted 2017-03-23 01:17:30.0)
Hello, thank you for contacting Thorlabs. The protective coating is SiO2, but we can likely offer a version with unprotected gold for your application. I will reach out to you directly about details for a quote.
dirk.lorenser  (posted 2016-03-21 20:16:33.827)
I can see from your feedback comments that you align these collimators using a shearing interferometer at 540nm wavelength. Can you give me a spec for the wavefront error (deviation from a plane wavefront) which you achieve using this technique (e.g. lambda/10 over the specified output beam diameter) ? The reason I'm asking is because I'd like to use the RC12APC-P01 as a "plane wave" reference for a test setup. Thanks.
besembeson  (posted 2016-03-25 08:40:04.0)
Response from Bweh at Thorlabs USA: I will contact you with this specification.
johannes.walter  (posted 2015-08-27 17:02:43.95)
Thank you very much for your reply. Unfortunately, I did not receive any email so far. Might it got lost?
besembeson  (posted 2015-08-28 08:42:31.0)
Response from Bweh at Thorlabs USA: Our Germany team fielded this request and has obtained the data. I will provide it to you via email.
johannes.walter  (posted 2015-07-21 19:13:00.247)
Could you offer the RC02SMA with the UV enhanced protected aluminum?
besembeson  (posted 2015-08-19 03:05:06.0)
Response from Bweh at Thorlabs USA: We can provide this to you. I will followup by email.
david.panak  (posted 2015-02-18 12:34:00.52)
which version of the collimator (SMA, APC, or FC)has a mechanical stop for the end of the fiber ferrule? I do not want the focal lenght of the collimator to change based upon how much the fiber ferrule was polished. thank you
cdaly  (posted 2015-02-24 04:29:20.0)
Response from Chris at Thorlabs: FC/PC and FC/APC fibers have spring loaded ferrules which will push against a hard stop in the bulkhead of the compatible collimators. SMA fiber connectors do not feature this. The ferrule will go in as far as it will based on where the fiber is when it is tightened down. That's not to say that the SMA connector would not still be held to a tight tolerance on the location of it's end face though.
czl0579  (posted 2014-12-05 16:14:07.957)
We find the surface roughness is <10nm. This should be very smooth. But when we unplug the SM fiber a little bit (therefore the output beam is divergent) and put a white board infront of the collimator, we can see the beam profile is not uniform. There seems some scratchs. Dose it make sense?
jlow  (posted 2015-01-12 04:23:37.0)
Response from Jeremy at Thorlabs: We have contacted you directly to discuss about the measurement of the surface roughness.
clarafly  (posted 2014-09-15 01:56:44.963)
I want to collimate a 1550-nm light from a SMF28 fiber, reflect the light with a mirror, and then couple it back to the same fiber. The mirror can be placed very close to the collimator. What's the expected coupling efficiency if I use these reflective collimators? Is it possible to reach 80%?
johannes.walter  (posted 2014-08-22 15:02:59.38)
Hello, I would like to ask you how you assure the correct distance between the fiber core and the mirror. To my experience, the ferrule length of the fiber can vary depending on the fiber and manufacturer. Thank you!
jlow  (posted 2014-08-28 03:14:19.0)
Response from Jeremy at Thorlabs: For alignment, a shearing interferometer is used to ensure collimation. We use the S460-HP fiber at 543nm during production.
chmpengb  (posted 2014-07-16 14:44:01.293)
I don't see this RC0x series collimating lens having any features that allows us to fine tune the focal length from the input fiber, thus my feeling that the output quality - though the beam will be more converg, will not be so parallel /collimated, Is my opinion right? I indeed concern whether it is able to achieve a real collimated beam. Please tell me. thanks
jlow  (posted 2014-08-07 02:06:42.0)
Response from Jeremy at Thorlabs: The focal length of the mirror is constant across the wavelength range so you do not need to fine tune this for different wavelength. The correct distance between the bulkhead and the mirror is set during production so that one would get a collimated output beam from a fiber.
tbd8  (posted 2014-07-01 16:12:04.577)
Hello, do you have zemax models of these collimators?
myanakas  (posted 2014-07-08 10:53:41.0)
Response from Mike at Thorlabs: Thank you for your feedback. I have contacted you to provide you with the Zemax files for these collimators. Based on this feedback, we are working to have this information available on the website shortly.
sivelinu  (posted 2014-06-28 13:58:04.19)
Could I receiving collimated beam with different collimator?(from RC02FC-P01 to TC12FC780)
jlow  (posted 2014-08-07 08:40:54.0)
Response from Jeremy at Thorlabs: The reflective collimator is generally used with MM fiber whereas the triplet collimator is generally used with SM fiber. If you are collimating the output from a MM fiber and coupling that into SM fiber, this would not work well. I will contact you directly to discuss more about what your application.
sivelinu  (posted 2014-06-18 11:50:11.96)
Hi. Could you tell me which collimator is suitable for me? I'm planning to have an experiment. - Collimated beam is launched from collimator and is reflected by mirror and come into collimator again.
besembeson  (posted 2014-06-19 10:56:28.0)
Response from Bweh at Thorlabs - USA: Thanks for contacting Thorlabs. Yes that can be used for such an application. To optimize coupling back to fiber, you will need kinematic adjustment either on the collimator or reflecting mirror or both. For the RC04FC-P01, the KM05 (http://www.thorlabs.hk/thorproduct.cfm?partnumber=KM05) can be considered. We also have fixed aspheric lens collimation packages that you may consider for your application: http://www.thorlabs.hk/navigation.cfm?guide_id=2235
joachim.fischer  (posted 2014-05-09 09:09:28.437)
Hi. Can you give some information on the beam profile one can expect from your reflectors when using a SM fiber in the visible? Some graphs, or M^2 values? Thanks in advance.
jlow  (posted 2014-05-12 01:33:05.0)
Response from Jeremy at Thorlabs: We will measure the beam profile from a SM fiber and send it to you directly.
codrut.raduta  (posted 2014-02-23 01:34:13.653)
Hello, I am trying to couple a 120 W, 1940 nm laser, 5.5 - 6 mm beam diameter into a SMA connector fiber (NA = 0.22, fiber diameter 200-800 microns). May a reflective collimator be used on reverse, from a given laser beam into fiber? Will RC08SMA-01 work on that? Do you have any other suggestions? Like a custom made coupler with clear aperture big enough to accomodate our laser beam diameter? Thank you. Cody
besembeson  (posted 2014-02-28 04:59:22.0)
Response from Bweh E at Thorlabs: Yes the RC08SMA-P01 can be used for your application. You may also consider our large beam diameter air-spaced doublet collimators, such as the F810SMA-2000. The stock model is aligned for 2um but we can provide a custom version aligned for 1940nm.
czl0579  (posted 2014-01-03 18:57:00.317)
Hi, I want to couple a collimated white light source (600-800 nm) into a fiber. Which collimator will have a better efficiency, the reflective collimators, triplet fiber optic collimators or achromatic fiberports? Thanks a lot!
jlow  (posted 2014-01-20 04:01:34.0)
Response from Jeremy at Thorlabs: The choice of the collimator depends on a few things, especially the fiber and the light source used. The reflective collimator offers truly achromatic performance and also a large aperture over the achromatic FiberPort and the triplet collimator. The achromatic FiberPort has X, Y, Z, tip, and tilt adjustment in a very compact package. However, you could also put the reflective collimator on a kinematic mounts for further alignment. I will contact you directly to discuss about your application in more detail.
grakes  (posted 2013-08-13 16:11:24.943)
Could you offer the RC02 with the UV enhanced protected aluminum?
jlow  (posted 2013-08-15 16:15:00.0)
Response from Jeremy at Thorlabs: We could possibly offer this. We will contact with you directly for the quote.
user  (posted 2013-07-19 17:55:11.403)
Hi, I have a 1000 µm core diameter fiber with 0.22 NA. Will the RC12 work properly with such large fiber core? Thanks and regard. Frederic
cdaly  (posted 2013-07-24 13:44:00.0)
Response from Chris at Thorlabs: Thank you for using our feedback tool. The reflective collimators will still work well, but not quite as well as with a single mode (~5-10 um core) 0.12 NA fiber. The beam size and divergence will be larger than what it specified for these fibers. Longer focal length collimators may be susceptible to come attenuation if the NA of the fiber is too large and the beam is clipped on the parabolic mirror inside.
johannes.walter  (posted 2013-07-03 17:05:54.04)
I have the same question the user "pain" had almost 2 years ago: Would it be possible to offer collimators using a mirror with a smaller focal length to obtain a 2 mm beam diameter? My setup: SMA-905 fiber connector, 200 µm core, NA=0.22, necessary wavelength range: 200 - 1200 nm
cdaly  (posted 2013-07-03 11:10:00.0)
Response from Chris at Thorlabs: Thank you for your feedback. We do have an RC02 reflective collimator in the design stage at the moment which will create about a 2mm beam diameter. Unfortunately there is no set date for release at the moment yet.
schaefer  (posted 2013-06-12 15:57:29.273)
Below you give a formular for the divergence of the beam: divergence = arctan (Core Diameter in mm / EFL in mm) how precise is this and where can I find information about how to derive this equation? thanks a lot!
pbui  (posted 2013-06-13 16:42:00.0)
Response from Phong at Thorlabs: The divergence can be found by tracing a ray from the bottom edge of the fiber core through the top edge of the lens. Applying the thin lens approximation will yield the approximate equation. More sophisticated ray tracing techniques can solve for the divergence more accurately.
syim  (posted 2013-05-14 22:00:04.577)
I was very happy to see this product, since I had a hope to collimate UV beams easily. But when I tried it, I was disappointed. The output beam is not a smooth beam, but has complicated structures like many grains. It makes me embarrassed since I had not noticed any description about the beam quality.
jlow  (posted 2013-05-15 11:19:00.0)
Response from Jeremy at Thorlabs: I apologize for the issue you are having. I will get in contact with you to discuss more about your applications and troubleshoot this.
andrea.dellapatria  (posted 2013-03-13 07:38:08.757)
Could you please tell me if RC04SMA-P01 may work well with an SMA multimode fiber bundle (N.A.=0.22)? Thanks a lot Regards Andrea ___
tcohen  (posted 2013-03-21 15:01:00.0)
Response from Tim at Thorlabs to Andrea: The RC04SMA-P01 shouldn’t clip your beam with that NA fiber. However, the collimation performance will suffer as the core size gets larger. To be able to see if it’s suitable we would also need to know your core size and the maximum divergence angle that your application is able to accept. I will contact you to discuss this in the context of your setup.
jlow  (posted 2012-08-29 17:05:00.0)
Response from Jeremy at Thorlabs: Thank you very much for your feedback. The output beam diameter is dependent on both the focal length and the numerical aperture (NA) of your fiber. The beam diameter specified online is based on a 0.13NA fiber. I will get in contact with you to discuss about your application.
bmangum  (posted 2012-08-24 10:56:05.0)
I am very happy to discover that these collimators are being offered. I would like to use them for microscopy applications (I imagine many other customers also). Many Microscope objectives have a back aperture diameter in the range of ~5-5.5 mm. It would be fantastic if you were offering this product that could directly yield a beam with a 5.5 mm diameter as this would allow direct use of the beam without further conditioning as it is desirable to fill (or slightly overfill) the back aperture of the objective with a collimated laser beam. Might you consider offering these products with more beam diameters?
tcohen  (posted 2012-05-09 15:17:00.0)
Response from Tim at Thorlabs: Thank you for your feedback! I will open a discussion regarding your idea with our production team. About 1/3 of our products are customer inspired and we appreciate you sharing your product idea as we continue to expand our catalog.
lg  (posted 2012-05-07 20:26:36.0)
Thor labs should really offer their 2 inch and 1 inch off-axis parabolas in a similar setup as RC12SMA. There have been so many times in the last 6 years I have wanted a plug and play parabola for a large core fiber collimated output. Offering the mounts are well and good, but have a well machined and aligned part that just drops into the Thor Labs cage mount system would save a lot of time and hassle.
bdada  (posted 2011-10-06 17:08:00.0)
Response from Buki at Thorlabs: Thank you for your feedback. We will contact you directly to discuss your application.
pain  (posted 2011-10-06 10:50:33.0)
Would it be possible for Thorlabs to offer collimators using a mirror with a smaller focal length to obtain a 2mm beam diameter using the same fiber ?
jjurado  (posted 2011-06-16 15:22:00.0)
Response from Javier at Thorlabs to freedayback: Thank you for contacting us. The formula we provide for the output beam diameter is simply a rough approximation, which assumes the output of the fiber to be a point source and is helpful for getting an idea of the required focal length and clear aperture of the collimating lens. As the core of the fiber increases, this approximation becomes less accurate, since the core can no longer be considered a point source. This is also why we recommend limiting the numerical aperture when using multimode fibers. Nonetheless, there are more robust formulas available that you could use. I will contact you directly for further support.
freedayback  (posted 2011-06-16 08:01:05.0)
its said that "output diameter=2*NA(fiber)*EFL? would the fibers core diameter affect the output diameter?
bdada  (posted 2011-04-26 17:52:00.0)
Response from Buki at Thorlabs: Thank you for your feedback. I am sorry to hear you've had problems using our reflective collimator. We have contacted you to get more information about your fiber and laser source so we can give you a better estimate of the coupling efficiency.
mike.staniforth  (posted 2011-04-26 12:21:55.0)
Hi I purchased one of these collimators for use in the mid IR. Laser beam of 1/e2 of ~5mm I have struggle to acheive any decent collimation onto my fibre (for which a lens set acheived 4 to 5 times the power collected). Do you know what might be going wrong - can I return?
Greg  (posted 2011-01-13 10:54:22.0)
A response from Greg at Thorlabs:You can estimate divergence with the following formula: divergence = arctan (Core Diameter in mm / EFL in mm)
user  (posted 2011-01-12 21:31:30.0)
Is there a simple way to estimate beam divergence from a multimode fiber for these collimators?
tor  (posted 2010-12-07 14:11:33.0)
Response from Tor at Thorlabs to day: Thank you for your interest in our reflective collimators. We will be soon releasing the RC04-series, which will include a 0.36 NA and will be available with APC receptacles. Subscribing to our new product RSS feed will allow you to track the release of these collimators: http://www.thorlabs.com/feeds.cfm
day  (posted 2010-12-06 10:33:20.0)
Hi, did you create an FC/APC version in the end? I would also be interested in such a version. Also, is it possible to get this collimator with a higher NA (~0.25)?
klee  (posted 2009-11-24 16:36:50.0)
A response from Ken at Thorlabs to mdefensor: The RC08FC is for FC/PC only. However, we are preparing to launch a APC version and could possibly make a special in 3 -4 weeks time.
mdefensor  (posted 2009-11-20 23:57:20.0)
Hi I would like to ask if it is possible to use an FC/APC fiber connector for this collimator. We are planning to use it as a collector for a fiber coupled imaging spectrometer. We would like to use an APC connector on the collection side to minimize back reflections which causes unwanted interference patterns in our obtained spectra.

FC/PC-Connectorized Protected Silver Reflective Collimators

  • Wide Key FC/PC Connector
  • Externally Threaded Aperture: Ø1/2" Lens Tube Compatible (Item Numbers Starting with RC02, RC04, and RC08), or Ø1" Lens Tube Compatible (Item Numbers Starting with RC12)
Compatible Stock Patch Cables
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FC/PC to FC/PC
FC/PC to FC/APC or SMA
AR-Coated FC/PC to FC/PC or FC/APC
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RC04FC-P01 Support Documentation
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RC08FC-P01 Support Documentation
RC08FC-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø8.5 mm Beam, FC/PC
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RC12FC-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø12 mm Beam, FC/PC
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FC/APC-Connectorized Protected Silver Reflective Collimators

  • Wide Key FC/APC Connector
  • Externally Threaded Aperture: Ø1/2" Lens Tube Compatible (Item Numbers Starting with RC02, RC04, and RC08), or Ø1" Lens Tube Compatible (Item Numbers Starting with RC12)
Compatible Stock Patch Cables
Single ModePolarization Maintaining
FC/APC to FC/APC
FC/APC to FC/PC
AR-Coated FC/APC to FC/PC
FC/APC to FC/APC
FC/APC to FC/PC
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RC02APC-P01 Support Documentation
RC02APC-P01Customer Inspired! Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø2 mm Beam, FC/APC
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RC04APC-P01 Support Documentation
RC04APC-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø4 mm Beam, FC/APC
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RC08APC-P01 Support Documentation
RC08APC-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø8.5 mm Beam, FC/APC
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RC12APC-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, EFL: 50.8 mm, FC/APC
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SMA-Connectorized Protected Silver Reflective Collimators

  • SMA Connectors Ideal for Multimode Fiber
  • Externally Threaded Aperture: Ø1/2" Lens Tube Compatible (Item Numbers Starting with RC02, RC04, and RC08), or Ø1" Lens Tube Compatible (Item Numbers Starting with RC12)
Compatible Stock Patch Cables
Single ModeMultimode
SMA to FC/PCSMA to SMA
High-Power SMA to SMA
SMA to FC/PC
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RC02SMA-P01 Support Documentation
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RC04SMA-P01 Support Documentation
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RC08SMA-P01 Support Documentation
RC08SMA-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø8.5 mm Beam, SMA
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RC12SMA-P01 Support Documentation
RC12SMA-P01Protected Silver Reflective Collimator, 450 nm - 20 µm, Ø12 mm Beam, SMA
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