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Off-Axis Parabolic Mirrors, Protected Gold Coating (0.8 - 20 µm)


  • Protected Gold Coating for 800 nm - 20 µm
  • Focus or Collimate Light without Spherical or Chromatic Aberrations
  • SM-Threaded, Unthreaded, and Post-Mountable Adapters Provide
    Flexible Mounting Options

MPD399-M01

Ø3", RFL = 9"

MPD149-M01

Ø1", RFL = 4"

MPD019-M01

Ø1/2", RFL = 1"

SM2MP

SM2-Threaded
Mounting Adapter

Ø2" Off-Axis Parabola in
a KS3 Mirror Mount with an
MP508P1 Mounting Adapter

Related Items


Please Wait
Fabrication of Off-Axis Parabolic Mirrors at Thorlabs
Click to Enlarge

After initial fabrication, all of our off-axis parabolic mirrors are finished on our single-point diamond turning machine. Visit our Custom Mirrors tab for more information.
Optical Coatings and Substrates
Optic Cleaning Tutorial
Engraved Back of OAP
Click to Enlarge

Engraving on Back of OAP Mirror

Features

  • >96% Average Reflectance Over a Broadband Range from 800 nm to
    20 µm
  • Collimates a Divergent Source or Focuses a Collimated Beam without Spherical or Chromatic Aberrations
  • Effective Focal Lengths from 15 mm (0.59") to 9" (228.6 mm)
  • Surface Roughness: <100 Å (RMS)
  • Clear Aperture: >90% of Diameter
  • Three Kinds of Mounting Adapters for Ø1/2", Ø1", and Ø2" Mirrors:
    • Externally SM-Threaded
    • Unthreaded for Use in Mirror Mounts
    • With 8-32 (M4) Taps for Post Mounting
  • One Mounting Adapter for Ø3" Mirrors with External SM2 Threading and 8-32 Taps for Post Mounting
  • Right-Angle Kinematic Mount for 30 mm Cage Systems and Ø1" OAP Mirrors

Thorlabs' Off-Axis Parabolic (OAP) Mirrors are mirrors whose reflective surfaces are segments of a parent paraboloid. They achromatically focus a collimated beam or collimate a divergent source, and their off-axis design separates the focal point from the rest of the beam path.

Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.

The angle between the focused beam and the collimated beam (off-axis angle) is 90°. As shown to the left, the propagation axis of the collimated beam should be normal to the base of the substrate to achieve a proper focus. The diamond-turned parabolic surface has a protected gold coating which provides >96% average reflectance from 800 nm - 20 µm. The protective overcoat results in polarization changes that can be difficult to quantify and sometimes induces absorption in the mid-to-far IR. See the Graphs tab to view the reflectance associated with various gold mirror coatings.

The OAP mirrors sold here are fabricated using aluminum substrates. The bottom of each mirror has three tapped mounting holes in a triangle pattern and an alignment hole for use with a mounting adapter (see the Mounting Adapters tab for more details). The non-optical surfaces are black-anodized and laser-engraved with the item number for easy identification.

Off-Axis Parabolic Mirrors Selection Guidea
Mirror Coating
(See Graphs Tab
for Reflectance)
Wavelength
Range
90 Degrees Off-Axis
90° Off-Axis
15, 40, 45, 60 Degrees Off-Axis
15°, 30°, 45°, 60° Off-Axis
90 Degrees, Hole Parallel to Focused Beam
90°, Hole Parallel to
Focused Beam
90 Degrees, Hole Parallel to Collimated Beam
90°, Hole Parallel to
Collimated Beam
UV-Enhanced Aluminum 250 nm - 450 nm Customb
Protected Aluminum 450 nm - 20 µm
Protected Silver 450 nm - 20 µm Customb
Protected Gold 800 nm - 20 µm
Unprotected Gold 800 nm - 20 µm Customb
  • To view the product presentation for each of our stocked off-axis parabolic mirrors, click the blue check icon (Check Mark).
  • We can manufacture off-axis parabolic mirrors with a variety of coatings, features, and off-axis angles. To request a quote for a custom mirror, please contact Tech Support.

 

Item # Diametera Thicknessa Reflected Focal Lengtha Parent Focal Lengtha Reflected Wavefront Error (RMS) Bottom Mounting Holes
MPD00M9-M01 0.5" (12.7 mm) 20.0 mm (0.79") 15.0 mm (0.59") 7.5 mm (0.30") <λ/4 at 633 nm 4-40 Taps in Radial Pattern
(3 Places)
MPD019-M01 0.5" (12.7 mm) 0.74" (18.8 mm) 1" (25.4 mm) 0.5" (12.7 mm)
MPD01M9-M01 0.5" (12.7 mm) 20.0 mm (0.79") 33.0 mm (1.3") 16.5 mm (0.65")
MPD029-M01 0.5" (12.7 mm) 0.74" (18.8 mm) 2" (50.8 mm) 1" (25.4 mm)
MPD039-M01 0.5" (12.7 mm) 0.74" (18.8 mm) 3" (76.2 mm) 1.5" (38.1 mm)
MPD119-M01 1" (25.4 mm) 1.25" (31.7 mm) 1" (25.4 mm) 0.5" (12.7 mm) <λ/2 at 633 nm
MPD129-M01 1" (25.4 mm) 1.25" (31.7 mm) 2" (50.8 mm) 1" (25.4 mm) <λ/4 at 633 nm
MPD139-M01 1" (25.4 mm) 1.25" (31.7 mm) 3" (76.2 mm) 1.5" (38.1 mm)
MPD149-M01 1" (25.4 mm) 1.25" (31.7 mm) 4" (101.6 mm) 2" (50.8 mm)
MPD159-M01 1" (25.4 mm) 1.25" (31.7 mm) 5" (127.0 mm) 2.5" (63.5 mm)
MPD169-M01 1" (25.4 mm) 1.25" (31.7 mm) 6" (152.4 mm) 3" (76.2 mm)
MPD189-M01 1" (25.4 mm) 1.25" (31.7 mm) 8" (203.2 mm) 4" (101.6 mm)
MPD229-M01 2" (50.8 mm) 2.47" (62.7 mm) 2" (50.8 mm) 1" (25.4 mm) <λ/2 at 633 nm 8-32 Taps in Radial Pattern
(3 Places)
MPD239-M01 2" (50.8 mm) 2.47" (62.8 mm) 3" (76.2 mm) 1.5" (38.1 mm)
MPD249-M01 2" (50.8 mm) 2.47" (62.8 mm) 4" (101.6 mm) 2" (50.8 mm) <λ/4 at 633 nm
MPD259-M01 2" (50.8 mm) 2.47" (62.8 mm) 5" (127.0 mm) 2.5" (63.5 mm)
MPD269-M01 2" (50.8 mm) 2.47" (62.8 mm) 6" (152.4 mm) 3" (76.2 mm)
MPD369-M01 3" (76.2 mm) 3.47" (88.2 mm) 6" (152.4 mm) 3" (76.2 mm) <λ/2 at 633 nm
MPD399-M01 3" (76.2 mm) 3.47" (88.2 mm) 9" (228.6 mm) 4.50" (114.3 mm)
  • The drawing to the right defines these quantities.
Common Specifications
Metallic Coating Protected Gold
Reflectance (Average) >96% from 800 nm to 20 µm
Off-Axis Angle 90°
Clear Aperture >90% of Diametera
Surface Roughness (RMS)  <100 Å
Surface Quality  40-20 Scratch-Dig
Parent Focal Length Tolerance ±1%
Reflected Focal Length Tolerance ±1%
Substrate Aluminum
Manufacturing Process Diamond Turned
  • The drawing to the right defines this quantity.

The shaded region in the graph denotes the range over which we guarantee the specified reflectance. Please note that the reflectance outside of this band is typical and can vary from lot to lot, especially in out-of-band regions where the reflectance is fluctuating or sloped.

Protected Gold at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Gold

Off-Axis Parabolic Mirror Metallic Coatings Unpolarized Light 45 Degree AOI

Excel Spreadsheet with Raw Data for Our Metallic Coatings
Mounting Adapter Installation
Click to Enlarge

Mounting Adapter Installation

Mounting Adapters
The bottom of each off-axis parabolic (OAP) mirror contains three tapped mounting holes in a triangle pattern and an alignment hole. These holes are used to attach our Mounting Adapters, which contain three corresponding counterbore holes or captive screws and an alignment pin (see the image to the right). Together, these features allow our OAP mirrors to be securely mounted. The tapped holes are also useful in OEM applications.

We offer three types of mounting plates for Ø1/2", Ø1", and Ø2" OAP mirrors. The first type is designed to be mounted in any Ø1", Ø2", or Ø3" mirror mount, depending upon the diameter of the OAP mirror. The second type, designed for post mounting, contains an 8-32 (M4) tapped hole on all four sides for direct mechanical compatibility with Ø1/2" Posts. The third type is externally SM threaded for direct compatibility with any of our internally SM-threaded components, such as our rotation mounts.

Our Ø1/2", Ø1", and Ø2" OAP mirrors can also be adapted to our SM threads by placing them into our SM Thread to Double Bore Adapters. This adapter allows rotation of the OAP mirror with respect to the adapter prior to securing its position, whereas when using the SM-threaded adapters offered on this page, the final location of the OAP mirror is dictated either by the threads themselves (when fully threaded into a mount) or by using the provided retaining ring to secure it in place.

For Ø3" OAP mirrors, we offer the SM2MP3 mounting adapter, which contains four 8-32 (M4) tapped holes for post mounting and has external SM2 threading for mounting on our SM2-threaded component, such as our K6X2 6-axis kinematic mount.

Alternatively, all of our OAP mirrors may be directly mounted in our Precision Kinematic Mirror Mounts using their outer diameter.

Selecting a Mirror Based on Desired Output Beam Diameter

When using an off-axis parabolic mirror to collimate a point source, selection of the appropriate mirror is often done based on the desired output beam diameter. Beam diameter can be calculated very easily using the divergence half-angle of the incident light (Θ) and the reflected focal length of the OAP mirror. To calculate the beam diameter in the small angle approximation, use the following equation:

Beam Diameter = 2 x sin(Θ) x Reflected Focal Length

If you are collimating from a fiber, the equation can be rewritten as:

Beam Diameter = 2 x NA (Fiber) x Reflected Focal Length

The table below lists the output beam diameter as a function of the reflected focal length of the mirror and the divergence half-angle of the incident light. Not listed here is the diameter of the OAP mirror. The clear aperture of the OAP mirror you select should be larger than the desired beam output diameter.

Reflected Focal Length Beam Diameter
  2.5° Source Divergence 5° Source Divergence 7.5° Source Divergence 10° Source Divergence
0.59" (15.0 mm) 1.3 mm 2.6 mm 3.9 mm 5.2 mm
1" (25.4 mm) 2.2 mm 4.4 mm 6.6 mm 8.8 mm
1.3" (33.0 mm) 2.9 mm 5.8 mm 8.6 mm 11.5 mm
2" (50.8 mm) 4.4 mm 8.9 mm 13.3 mm 17.6 mm
3" (76.2 mm) 6.6 mm 13.3 mm 19.9 mm 26.5 mm
4" (101.6 mm) 8.9 mm 17.7 mm 26.5 mm 35.4 mm
5" (127.0 mm) 11.1 mm 22.1 mm 33.2 mm 44.1 mm
6" (152.4 mm) 13.3 mm 26.6 mm 39.8 mm 52.9 mma
8" (203.2 mm) 17.7 mm 35.4 mm 53.0 mma 70.6 mma
9" (228.6 mm) 19.9 mm 39.8 mm 59.7 mma 79.4 mma,b
  • Please note that this diameter exceeds the clear aperture of our Ø2" parabolic mirrors.
  • Please note that this diameter exceeds the clear aperture of our Ø3" parabolic mirrors.

Custom Off-Axis Parabolic (OAP) and Aspheric Mirrors

Key Capabilities

  • Nanotech® 450UPL Ultra Precision 3-Axis CNC Diamond Turning Lathe for Individual Custom Mirrors
  • Custom Sizes, Focal Lengths, Substrates, Coatings, and Clearance Holes
  • Off- and On-Axis Parabolic, Conical, and Toroidal Mirrors
  • Biconic Surfaces and Irregular Aspheric Optics

Thorlabs' advanced single-point diamond turning capabilities allow us to produce custom OAP and aspheric mirrors in small quantities. We can produce long focal length and large diameter optics, as well as optics with custom shapes.
Toroidal Mirror
Click to Enlarge

We offer OAP mirrors with custom sizes, focal lengths, substrates, coatings, and clearance holes.

In addition to our stock off-axis parabolic (OAP) mirrors, Thorlabs is also capable of manufacturing a variety of custom aspheric mirrors. Our unique single-point diamond turning (SPDT) capabilities allow us to produce these customs in low quantities at prices that are comparable with our stock offerings. As shown in the video to the right, we engage the slow-slide-servo process of our SPDT machine to polish individual off-axis mirrors by synchronizing the rotational position of the spindle with the linear position of the translation axes.

Toroidal Mirror
Click to Enlarge

Toroidal mirrors have two different radii of curvature and are used to image off-axis points without introducing astigmatism.
Conical Mirror
Click to Enlarge

Conical mirrors provide 360° of illumination.

This unique manufacturing capability allows us to provide OAP mirrors with custom reflected focal lengths and diameters, including long-focal-length and large-diameter optics that cannot be produced by conventional two-axis machining. In addition, we can produce OAP mirrors with a variety of custom substrates (including copper), custom coatings, and custom hole sizes and shapes. The use of copper substrates and other advanced techniques also allow us to offer OAP mirrors with enhanced finishes that exhibit less surface roughness than our our stock products, resulting in improved wavefront quality.

Our SPDT competency also enables us to produce mirrors with other custom biconic surfaces and aspheric shapes, including on-axis parabolic, conical, and toroidal mirrors. These custom mirror shapes can be used in a wide variety of optical instruments and specialized imaging systems. For example, toroidal mirrors, which are used to image off-axis points without introducing astigmatism, are commonly used in compact Czerny-Turner monochromators. Conical mirrors, on the other hand, are ideal for non-imaging applications that require 360° of uniform illumination.

We are generally able to produce custom OAP mirrors and aspheric mirrors with short lead times. For modifications to an existing part, delivery in 4-6 weeks is standard. For custom shapes and long focal length optics, a 6-8 week lead time is typical. To receive more information or a quote for a custom optic, please contact Tech Support.

Our engineers are available to help manufacture optics for your application.

Customs are available in low quantities at prices that are comparable with our stock catalog products.
Please contact techsupport@thorlabs.com with your custom optic requests.

Insights into Off-Axis Parabolic Mirrors

Scroll down to read about the unique properties of off-axis parabolic (OAP) mirrors and how to take advantage of them:

  • Focus Collimated Light / Collimate Light from a Point Source
  • Benefits of Pairing OAP Mirrors
  • Mounting and Aligning an OAP Mirror

Click here for more insights into lab practices and equipment.

 

Focus Collimated Light / Collimate Light from a Point Source

Parabolic and off-axis parabolic (OAP) mirrors will only provide the expected well-collimated beam or diffraction-limited focal spot when the correct beam type is incident along the proper axis. This due to the parabolic shape of these mirrors' reflective surfaces, which are not symmetric around their focal points.

Parabolic vs. Off-Axis Parabolic Mirrors
The reflective surface of an OAP mirror is a section of the parent parabola that is not centered on the parent's optical axis (Figure 1). A conventional parabolic mirror is illustrated in Figure 2.

The optical axis of an OAP mirror is parallel to, but displaced from the optical axis of the parent parabola. The focal point of the OAP mirror coincides with that of the parent parabola.

The focal axis of the OAP mirror passes through the focal point and the center of the OAP mirror. The focal and optical axes of an OAP mirror are not parallel. In contrast, these axes coincide for parabolic mirrors whose reflective surfaces are centered on optical axis of the parent parabola.

Focus Collimated Light
If a parabolic or OAP mirror is being used to focus a beam of collimated light to a diffraction-limited point, the light must be directed along the mirror's optical axis (Figures 1 and 2).

Collimated light that is not directed parallel to the optical axis will not focus to a unique point (Figure 3).

Thorlabs recommends against directing collimated light along the focal axis of OAP mirrors, or along any direction that is not parallel to the optical axis, since the light will not focus to a diffraction-limited spot.

Collimate Light from a Point Source
To obtain highly collimated light from a point source, the point source should be located at the mirror's focal point.

Light from a point source will be poorly collimated if the point source is placed along the OAP mirror's optical axis, or anywhere else that is not the focal point.

An OAP mirror can also be used to collimate a spherical wave, if its origin coincides with the focal point of the mirror.

Parabolic mirror does not focus light to diffraction-limited spot when collimated beam not parallel to optical axis
Click to Enlarge

Figure 3: When the collimated beam is not directed along the mirror's optical axis, the mirror does not provide a diffraction-limited spot. Instead, the focal region is spread out.
Parabolic mirrors focus to diffraction-limited spot collimated light parallel to optical axis
Click to Enlarge

Figure 2: When the collimated beam is parallel to the optical axis of a parabolic or OAP mirror, the light focuses to a diffraction-limited spot.
Focal and optical axes of off-axis parabolic (OAP) mirrors
Click to Enlarge

Figure 1: The focal and optical axes of an OAP mirror do not coincide and are not parallel.

Date of Last Edit: Dec. 4, 2019

 

Benefits of Pairing OAP Mirrors

off-axis parabolic mirrors in-line with optical fiber
Click to Enlarge

Figure 5: A pair of OAP mirrors can be used to couple light out of one fiber and into another. This provides access to the beam when it is necessary to insert bulk optics into the optical path. Due to the small dimension of the fiber core, light emitted from the fiber end face is similar to a point source.
Two off-axis parabolic mirrors used to relay a beam.
Click to Enlarge

Figure 4: A pair of OAP mirrors can be used in imaging applications, and/or to relay a beam across a distance.

Relay an Image
A single OAP mirror is not recommended for finite conjugate imaging applications, when neither light beam is collimated, but a pair of OAP mirrors can successfully be used for this purpose. An example setup is illustrated in Figure 4.

The dual OAP configuration facilitates the process of adjusting the distance between mirrors. The leg of collimated light is also convenient for inserting filters and other optical elements into the beam. Another benefit is that distance between the two mirrors can be adjusted to move the focal point across the source and/or target planes without disturbing the alignment of the system.

Provide Access to the Beam in a Fiber Network
A pair of OAP mirrors can be used to create a free-space leg in an optical fiber system, which is one way to provide access to the light beam. The illustration in Figure 5 shows an example of this configuration, which can be useful when filters or other bulk optics need to be inserted into the beam path. The length of the free-space leg can be adjusted without disturbing alignment.

When setting up this system, the fibers' end faces must be aligned so that their cores coincide with the source and target focal points, respectively. The collimated beam paths of both mirrors should be co-linear and completely overlapping.

This configuration is the basis for fiber optic filter / attenuator mounts.

Date of Last Edit: Dec. 4, 2019

 

Mounting and Aligning an OAP Mirror

Shear Plate to Align OAP Mirror
Click to Enlarge

Figure 7: When using an OAP mirror to collimate a point source, a shear plate interferometer placed in the output beam can facilitate the alignment process.
Mounting an OAP Mirror
Click to Enlarge

Figure 6: The shape of the OAP mirror's reflective profile matches a section of the parent parabola that is not centered on the focal point. Due to this, the OAP's reflective surface is not rotationally symmetric. When mounting the mirror, care should be taken to ensure the mirror does not rotate around its optical axis.

OAP mirrors are not rotationally symmetric. This is due to their reflective surfaces being taken from sections of the parent parabola curve located away from the focal point (Figure 6).

Due the asymmetry of the reflector, when an OAP mirror rotates, the position of its focal point also rotates. Since this could negatively impact the performance of an optical system, the mirror should be fixed so that the reflective surface cannot rotate around its optical axis.

The optical performance of the mirror is also sensitive to alignment drift with respect to the other five degrees of freedom. One way to protect against alignment drift is to use a fixed, rather than a kinematic, mount.

Using a shear plate interferometer can be helpful when aligning an OAP mirror to an input point source. The shear plate interferometer should intercept the output beam (Figure 7), to assess its collimation quality. Alignment is optimized when the quality of the collimated beam is optimized. 

Date of Last Edit: Dec. 4, 2019


Posted Comments:
Taean  (posted 2018-12-25 20:16:05.487)
Hello, is there any reason to make MP254P2 and MP254P1 in different size and shape?
llamb  (posted 2018-12-27 08:42:25.0)
Hello, thank you for your feedback. The MP254P1 features the Ø2" outer diameter for mounting easily into other standard Ø2" optic mounts or housings. The outer diameter on the MP254P2 is slightly larger (Ø2.1") such that there is a fixed standard distance from the center of the optic to the flat edge of the adapter, in this case a 1" distance. Keeping this standard fixed distance for post-mounting purposes makes the MP254P2 adapter too large to be mounted in a Ø2" optic mount.
benoit.lecomte  (posted 2017-10-17 09:29:10.917)
Hello, I would like to know if there are reservations to the use of aluminum parabolic mirrors with or protected in the vacuum at 80 ° K? Thank you for the answer. Best regards, Benoît Lecomte
nbayconich  (posted 2017-10-17 03:36:58.0)
Thank you for contacting Thorlabs. We have not done vacuum and temperature testing for these OAP mirrors that would cover your working conditions. Certainly the anodization would outgas, but we can offer unanodized version upon request. While I also have reservations about the thermal exapansion of the aluminum substrate and optical coatings, I am not sure if this would adversely affect performance. We can offer a sample for your testing. I will contact you directly with more information.
boulder.j.j  (posted 2016-11-04 10:49:06.047)
Dear Sir/Madam, We are using now MPD229-M01 and MPD229H-M01, and would like to do simulation using Zemax. Can Thorlabs supply the Zemax files for these two mirrors? Thanks for your help. Sincerely, Jian Jiang
tfrisch  (posted 2016-11-04 11:41:30.0)
Hello, thank you for contacting Thorlabs. I will track down these files for you. I have reached out to you directly.
wurden  (posted 2016-06-08 11:38:22.05)
Hello, For your Off-Axis Mirrors (MPD399-M03 in particular), I Need to know the type of aluminum used for the metal Substrate? What alloy? Is it for example 6061 aluminum, or something else. My vacuum People want to know. Thankyou, Glen Wurden
besembeson  (posted 2016-06-08 11:00:58.0)
Response from Bweh at Thorlabs USA: Yes the substrate is 6061 aluminum.
llopez  (posted 2015-12-11 02:23:35.0)
Good day, I would like to ask how can I mount the paraboliod mirror (MPD249-M01) to a xyz translation stage (PT3). Thank you very much.
jlow  (posted 2015-12-14 11:16:05.0)
Response from Jeremy at Thorlabs: We offer mounts such as the MP508P1 and MP508P2, and SM2MP that you can used to mount the Ø2" OAP on the stage. I will contact you directly to discuss about which particular one to get for your application.
stockbr  (posted 2014-10-02 11:28:00.87)
I strongly recommend changing the way you label these mirrors when they are shipped to the customer. The specifications listed on the box are the part number, diameter, angle, and PARENT focal length. The most useful specification on these mirrors is the REFLECTED focal length. Seeing the PFL listed is very confusing to the end user. It would also be helpful to list the focal length on the part itself. It is not convenient to look up the part number to identify the focal length. I acknowledge that you can get the RFL from the PFL and the angle, but there is no reason to list the PFL in the first place when the RFL is the number that is useful to the customer. My mirrors are a few years old, so if you have already updated this then please disregard my comment.
jlow  (posted 2014-10-02 02:27:18.0)
Response from Jeremy at Thorlabs: Thank you very much for your feedback on the part numbering system. We will look into the best way to update the part numbers to be more intuitive and change them accordingly.
oliva  (posted 2013-02-12 09:00:52.63)
For astronomical applications, we have so far used off-axis parabolae from the long list available from the Edmund's catalog. Main problem/limitation is the coating: Edmund only sells protected-Al and protected-Au; while we need protected-Ag. We are very excited to see that you offer the same type of parabolae silver-coated. Pity that you presently have only a limited choice of angles and focal lengths. I hope you'll soon extend the list. In case, please contact me, I will be happy to give you the list of the 5 types of parabolae that we most urgently need. Although we are small customers (..just need a few items per type...) I nonetheless hope you will consider this possibility to extend your business. Thank you very much for your kind attention Best regards Ernesto Oliva
tcohen  (posted 2012-07-03 15:37:00.0)
Response from Tim at Thorlabs to Charles: The procedure for this would be to lacquer or photoresist the mirrored surface. After the coating dries, apply masking tape to the coated (painted) surface and trim the excess. Drill through the back side with a sharp bit. Remove the tape, deburr by hand, blow off the surface to remove any particles, rinse using a squeeze bottle of acetone to remove the photoresist or lacquer and do not wipe until you are sure that there are no aluminum particles. The final step is to drag wipe the surface by moistening a piece of tissue paper with acetone, laying it on the polished surface and dragging it across the part using only the weight of the wet paper.
N1107743J  (posted 2012-07-03 03:27:11.0)
Hi I was actually interested in odonnela's post about drilling a hole at the focal point. Can you please let me know if there is a possibility to do so and if so what the procedure would be. Thank you in advance, Charles
tcohen  (posted 2012-05-22 11:28:00.0)
Response from Tim at Thorlabs to Bridget: Thank you for contacting us! The housing itself would not be a problem, but the manufacturing difficulties in regards to working with the coating would most likely make this cost-prohibitive for small quantities. If you are open to different ideas, it is possible that your end goal can be achieved using different methods. I will contact you to discuss your application further.
odonnela  (posted 2012-05-17 16:32:16.0)
I had a question about the off-axis parabolic mirrors. We have an application where we would want infrared light to reflect off of the parabolic mirror and have ultraviolet light pass through a hole in the center of the mirror so that the two beams are co-propagating into our vacuum chamber. Would it be possible to have a hole drilled (probably just a few millimeters) through the center of one of the gold parabolic mirrors? I'm not sure what the black mount encompasses or if this would be possible, but I would appreciate some help in the matter. Thank you. Bridget
tcohen  (posted 2012-04-16 15:04:00.0)
Response from Tim at Thorlabs: Thank you for your feedback. The –P2 adapters have larger outer diameters that will not fit in a standard mirror mount. These are equipped with 8-32 (M4) tapped holes for post mounting. If you are interested in compatibility with our standard mirror mounts, please consider looking at the –P1 adapters which serve this purpose.
piksarv  (posted 2012-04-13 21:06:44.0)
Concerning the mounting adapters, it remains unclear to me, if it is possible to use also the P2 ending adapters for mounting the mirros to standard kinematic mirror mounts?
tcohen  (posted 2012-02-23 10:11:00.0)
Response from Tim at Thorlabs: Thank you for your interest in our silver coated off-axis parabolic mirrors. We are happy to announce that we do have new versions planned. Specifically, the product you mentioned is an active project in the design and testing phase.
michael.smith  (posted 2012-02-23 09:40:37.0)
I was happy to see you have now added silver coating to your off-axis parabolic mirror options. Is there any chance that the RFL = 50.8 mm mirror will be offered in a 2 inch format?
bdada  (posted 2012-02-08 20:21:00.0)
Response from Buki at Thorlabs to the last poster: Thank you for your interest in off axis parabolic mirrors. We will add your request to our product development forum and consider it as we continue to expand our selection of parabolic mirrors. Please contact TechSupport@thorlabs.com if you have any questions.
user  (posted 2012-01-31 01:22:54.0)
Hi, will you be offering 76.2mm OAP in the future? thanks
npalka  (posted 2011-06-13 22:06:47.0)
Dear Thorlabs, Can I use your off-axis mirrors and mirrors PF10-03-M01 in THz range (0.1-3THz)? Best regards, Norbert Palka

Ø1/2" 90° Off-Axis Parabolic Mirrors, Protected Gold Coating

Item # Diametera RFLa PFLa Thicknessa RWE Mounting Featuresb
MPD00M9-M01 0.5"
(12.7 mm)
15.0 mm (0.59") 7.5 mm (0.30") 20.0 mm (0.79") <λ/4 at
633 nm
Three 4-40 Taps
on Bottom
MPD019-M01 1" (25.4 mm) 0.5" (12.7 mm) 0.74" (18.8 mm)
MPD01M9-M01 33.0 mm (1.30") 16.5 mm (0.65") 20.0 mm (0.79")
MPD029-M01 2" (50.8 mm) 1" (25.4 mm) 0.74" (18.8 mm)
MPD039-M01 3" (76.2 mm) 1.5" (38.1 mm)
  • The diagram in the Overview tab defines these quantities.
  • See below for the corresponding mounting adapters.

RFL = Reflective Focal Length
PFL = Parent Focal Length

RWE = Reflected Wavefront Error

OAP Mirror with MP127P1 Adapter Mounted in Mirror Mount
Click to Enlarge

Ø1/2" Gold OAP Mirror in a KS1 Mirror Mount Using an MP127P1 Adapter
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MPD00M9-M01 Support Documentation
MPD00M9-M01Ø1/2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 15 mm
$149.33
Today
MPD019-M01 Support Documentation
MPD019-M01Ø1/2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 1"
$149.33
Today
MPD01M9-M01 Support Documentation
MPD01M9-M01Ø1/2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 33 mm
$149.33
5-8 Days
MPD029-M01 Support Documentation
MPD029-M01Ø1/2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 2"
$149.33
Today
MPD039-M01 Support Documentation
MPD039-M01Customer Inspired! Ø1/2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 3"
$149.33
Today

Ø1" 90° Off-Axis Parabolic Mirrors, Protected Gold Coating

Item # Diametera RFLa PFLa Thicknessa RWE Mounting Featuresb
MPD119-M01 1"
(25.4 mm)
1" (25.4 mm) 0.5" (12.7 mm) 1.25" (31.7 mm)  <λ/2 at 633 nm Three 4-40 Taps
on Bottom
MPD129-M01 2" (50.8 mm) 1" (25.4 mm) <λ/4 at 633 nm
MPD139-M01 3" (76.2 mm) 1.5" (38.1 mm)
MPD149-M01 4" (101.6 mm) 2" (50.8 mm)
MPD159-M01 5" (127.0 mm) 2.5" (63.5 mm)
MPD169-M01 6" (152.4 mm) 3" (76.2 mm)
MPD189-M01 8" (203.2 mm) 4" (101.6 mm)
  • The diagram in the Overview tab defines these quantities.
  • See below for the corresponding mounting adapters.

RFL = Reflective Focal Length
PFL = Parent Focal Length

RWE = Reflected Wavefront Error

Parabolic Mirror Mounted in a POLARIS-K1 Mirror Mount
Click to Enlarge
Ø1" Gold OAP Mirror Directly Mounted in a POLARIS-K1 Kinematic Mirror Mount
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MPD119-M01 Support Documentation
MPD119-M01Customer Inspired! Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 1"
$209.93
Today
MPD129-M01 Support Documentation
MPD129-M01Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 2"
$209.93
Today
MPD139-M01 Support Documentation
MPD139-M01Customer Inspired! Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 3"
$209.93
Today
MPD149-M01 Support Documentation
MPD149-M01Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 4"
$209.93
Today
MPD159-M01 Support Documentation
MPD159-M01Customer Inspired! Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 5"
$209.93
Today
MPD169-M01 Support Documentation
MPD169-M01Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 6"
$209.93
Today
MPD189-M01 Support Documentation
MPD189-M01Customer Inspired! Ø1" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 8"
$209.93
Today

Ø2" 90° Off-Axis Parabolic Mirrors, Protected Gold Coating

Item # Diametera RFLa PFLa Thicknessa RWE Mounting Featuresb
MPD229-M01 2"
(50.8 mm)
2" (50.8 mm) 1" (25.4 mm) 2.47" (62.7 mm) <λ/2 at 633 nm Three 8-32 Taps
on Bottom
MPD239-M01 3" (76.2 mm) 1.5" (38.1 mm) 2.47" (62.8 mm)
MPD249-M01 4" (101.6 mm) 2" (50.8 mm) <λ/4 at 633 nm
MPD259-M01 5" (127.0 mm) 2.5" (63.5 mm)
MPD269-M01 6" (152.4 mm) 3" (76.2 mm)
  • The diagram in the Overview tab defines these quantities.
  • See below for the corresponding mounting adapters.

RFL = Reflective Focal Length
PFL = Parent Focal Length

RWE = Reflected Wavefront Error

OAP Mirror Mounted in a Cage System Using SM2MP Adapter
Click to Enlarge

Ø2" OAP Mirror Threaded into a KC2-T Cage Mount Using an
SM2MP Adapter
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MPD229-M01 Support Documentation
MPD229-M01Ø2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 2"
$353.86
Today
MPD239-M01 Support Documentation
MPD239-M01Customer Inspired! Ø2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 3"
$353.86
Today
MPD249-M01 Support Documentation
MPD249-M01Ø2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 4"
$353.86
Today
MPD259-M01 Support Documentation
MPD259-M01Customer Inspired! Ø2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 5"
$353.86
Today
MPD269-M01 Support Documentation
MPD269-M01Ø2" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 6"
$353.86
Today

Ø3" 90° Off-Axis Parabolic Mirrors, Protected Gold Coating

Item # Diametera RFLa PFLa Thicknessa RWE Mounting Featuresb
MPD369-M01 3"
(76.2 mm)
6" (152.4 mm) 3" (76.2 mm) 3.47" (88.2 mm) <λ/2 at 633 nm Three 8-32 Taps
on Bottom
MPD399-M01 9" (228.6 mm) 4.5" (114.3 mm)
  • The diagram in the Overview tab defines these quantities.
  • See below for the corresponding mounting adapters.

RFL = Reflective Focal Length
PFL = Parent Focal Length

RWE = Reflected Wavefront Error

OAP Mirror in Kinematic Mount
Click to Enlarge

MPD399-M01 Directly Mounted in a KS3 Mirror Mount
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MPD369-M01 Support Documentation
MPD369-M01Ø3" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 6"
$635.20
Today
MPD399-M01 Support Documentation
MPD399-M01Ø3" 90° Off-Axis Parabolic Mirror, Prot. Gold, RFL = 9"
$745.58
5-8 Days

Ø1/2" Off-Axis Parabolic Mirror Mounting Adapters

OAP Mirror Mounted on a Post Using MP127P2 Adapter
Click to Enlarge

Ø1/2" OAP Mirror Mounted on a Ø1/2" Post Using an MP127P2 Adapter
MP127P1 OAP Mirror Adapter Mounted in Kinematic Mirror Mount
Click to Enlarge

Ø1/2" OAP Mirror in a KS1 Mirror Mount Using an MP127P1 Adapter
OAP Mirror  Mounted in Kinematic Mirror Mount Using SM1MP Adapter
Click to Enlarge

Ø1/2" OAP Mirror Threaded into a KC05-T Cage Mount Using an SM05MP Adapter
  • Contain Three #4 Counterbores and an Alignment Pin for Mounting to Ø1/2" OAP Mirrors
  • SM05MP: Diameter is Externally SM05 Threaded
  • MP127P1: Designed to Fit into Ø1" Mirror Mounts
  • MP127P2(/M): Post Mountable in Four Orientations

Our Mounting Adapters for Ø1/2" Off-Axis Parabolic Mirrors provide mounting alternatives to our smooth bore kinematic mirror mounts. Each contains three #4 counterbores that are positioned to align with the 4-40 tapped holes on our Ø1/2" OAP mirrors. Three 4-40 cap screws and the required 3/32" hex key are provided with each adapter.

SM05MP
The SM05MP OAP Mirror Adapter is externally SM05 threaded (0.535"-40), which allows a Ø1/2" OAP mirror to be directly mounted to an internally SM05-threaded component. The adapter is designed to allow easy adaptability to a 16 mm cage system as well as SM05-threaded mirror, translation, and rotation mounts. The included SM05RR retaining ring secures the adapter in place when it is threaded into a mount. An SPW603 Spanner Wrench can be used to tighten the retaining ring against the OAP mirror housing.

MP127P1
The unthreaded MP127P1 OAP Mirror Adapter is sized to fit inside a Ø1" mirror mount, such as the KS1 Mirror Mount shown above.

MP127P2(/M)
The MP127P2(/M) OAP Mirror Adapter contains four 8-32 (M4) taps for post mounting that orient the OAP mirror at right angles. The distance from the center of the optic to the edge of the mount in the MP127P2 is 1/2" (12.5 mm), allowing for standardized optical axis heights when used with a fixed height post, such as our Ø1" Posts. Please note that the MP127P2(/M) is not compatible with Ø1" mirror mounts, and is instead designed for post mounting.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
MP127P2 Support Documentation
MP127P28-32-Threaded Adapter for Ø1/2" Off-Axis Parabolic Mirrors
$24.35
Lead Time
+1 Qty Docs Part Number - Universal Price Available
SM05MP Support Documentation
SM05MPExternally SM05-Threaded Adapter for Ø1/2" Off-Axis Parabolic Mirrors
$25.43
Today
MP127P1 Support Documentation
MP127P11" Outer Diameter Adapter for Ø1/2" Off-Axis Parabolic Mirrors
$22.07
5-8 Days
+1 Qty Docs Part Number - Metric Price Available
MP127P2/M Support Documentation
MP127P2/MM4-Threaded Adapter for Ø1/2" Off-Axis Parabolic Mirrors
$24.35
Today

Ø1" Off-Axis Parabolic Mirror Mount and Mounting Adapters

MP254P2 OAP Mirror Adapter Mounted on Post
Click to Enlarge

Ø1" OAP Mirror Mounted on a Ø1/2" Post Using an
MP254P2 Adapter
Off-Axis Parabolic Mirror Mounted in Mirror Mount Using MP254P1
Click to Enlarge

Ø1" OAP Mirror in a KS2 Mirror Mount Using an
MP254P1 Adapter
SM1MP Adapter Used to Mount an OAP Mirror in a Cage System
Click to Enlarge

Ø1" OAP Mirror Threaded into a CP02 Cage Plate Using an
SM1MP Adapter
  • Contain Three #4 Counterbores and an Alignment Pin for Mounting to Ø1" OAP Mirrors
  • SM1MP: Diameter is Externally SM1 Threaded
  • MP254P1: Designed to Fit into Ø2" Mirror Mounts
  • MP254P2(/M): Post Mountable in Four Orientations
  • KCB1P(/M): Right-Angle Kinematic Mount

Our Kinematic Right-Angle Mount and Mounting Adapters for Ø1" Off-Axis Parabolic Mirrors provide mounting alternatives to our smooth bore kinematic mirror mounts. Each offers three #4 counterbores that are positioned to align with the 4-40 tapped holes on our Ø1" OAP mirrors.

SM1MP
The SM1MP OAP Mirror Adapter is externally SM1 threaded (1.035"-40) which allows a Ø1" OAP mirror to be directly mounted to an internally SM1-threaded component. The adapter is designed to allow easy adaptability to a 30 mm cage system as well as SM1-threaded mirror, translation, and rotation mounts. The included SM1RR retaining ring secures the adapter in place when it is threaded into a mount. An SPW606 and a SPW909 or SPW801 Spanner Wrench can be used to thread the retaining ring and adapter, respectively. Three 4-40 cap screws and the required 0.05" hex key are provided with each adapter.

MP254P1
The unthreaded MP254P1 OAP Mirror Adapter is sized to fit inside a Ø2" mirror mount, such as the KS2 Mirror Mount shown above. Three 4-40 cap screws and the required 3/32" hex key are provided with each adapter.

MP254P2(/M)
The MP254P2(/M) OAP Mirror Adapter contains four 8-32 (M4) taps for post mounting that orient the OAP mirror at right angles. The distance from the center of the optic to the edge of the mount in the MP254P2 is 1" (25.4 mm), allowing for standardized optical axis heights when used with a fixed height post, such as our Ø1" Posts. Please note that the MP254P2(/M) is not compatible with Ø2" mirror mounts, and is instead designed for post mounting. Three 4-40 cap screws and the required 3/32" hex key are provided with each adapter.


Click to Enlarge

KCB1P Mount is Compatible with 30 mm Cage Systems and SM1 Lens Tubes

Click to Enlarge

KCB1P Mounting Plate and Housing Body Shown with Ø1" Off-Axis Parabolic Mirror

KCB1P(/M)
The KCB1P(/M) Right-Angle Kinematic Mount provides ±4° of pitch and yaw adjustment for a Ø1" off-axis parabolic (OAP) mirror mounted on a plate that positions the surface of the mirror at a 45° angle. The ports are SM1 threaded (1.035"-40) for compatibility with our SM1 Lens Tubes and each face has four Ø6 mm smooth bore holes for compatibility with the ER rods for our 30 mm Cage System. The top and bottom of the mount also offer 1/4"-20 (M6) mounting holes for compatibility with Ø1/2" and Ø1" Posts.

The rear-loading, removable mounting plate features our ball and V-groove design that allows it to be precisely kinematically positioned on the body of the mount. The rear-loading design ensures that the optic remains accessible even after the mount is fitted with cage rods or lens tubes.

For more information on KCB1P(/M) Mount, see the full web presentation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KCB1P Support Documentation
KCB1PCustomer Inspired! Right-Angle Kinematic OAP Mirror Mount, 30 mm Cage System and SM1 Compatible, 1/4"-20 Mounting Holes
$231.75
Today
MP254P2 Support Documentation
MP254P28-32-Threaded Adapter for Ø1" Off-Axis Parabolic Mirrors
$30.03
Today
+1 Qty Docs Part Number - Universal Price Available
SM1MP Support Documentation
SM1MPExternally SM1-Threaded Adapter for Ø1" Off-Axis Parabolic Mirrors
$30.03
Today
MP254P1 Support Documentation
MP254P12" Outer Diameter Adapter for Ø1" Off-Axis Parabolic Mirrors
$27.59
Today
+1 Qty Docs Part Number - Metric Price Available
KCB1P/M Support Documentation
KCB1P/MCustomer Inspired! Right-Angle Kinematic OAP Mirror Mount, 30 mm Cage System and SM1 Compatible, M6 Mounting Holes
$231.75
Today
MP254P2/M Support Documentation
MP254P2/MM4-Threaded Adapter for Ø1" Off-Axis Parabolic Mirrors
$30.03
Today

Ø2" Off-Axis Parabolic Mirror Mounting Adapters

Off-Axis Parabolic Mounted on Post using MP508P2 Adapter
Click to Enlarge

Ø2" OAP Mirror with Hole Parallel to Focused Beam Mounted on a Ø1/2" Post
Using an MP508P2 Adapter
OAP Mirror with MP254P1 Adapter Mounted in Kinematic Mirror Mount
Click to Enlarge

Ø2" OAP Mirror in KS3 Mirror Mount Using an
MP508P1 Adapter
OAP Mirror Mounted in Cage System using SM2MP Adapter
Click to Enlarge

Ø2" OAP Mirror Threaded into a KC2-T Cage Mount Using an
SM2MP Adapter
  • Contain Three #8 Counterbores and an Alignment Pin for Mounting to Ø2" OAP Mirrors
  • SM2MP: Diameter is Externally SM2 Threaded
  • MP508P1: Designed to Fit into Ø3" Mirror Mounts
  • MP508P2(/M): Post Mountable in Four Orientations

Our Mounting Adapters for Ø2" Off-Axis Parabolic Mirrors provide mounting alternatives to our smooth bore kinematic mirror mounts. Each contains three #8 counterbores that are positioned to align with the 8-32 tapped holes on our Ø2" OAP Mirrors. Please note that these adapters will block the through holes on OAP Mirrors with holes parallel to the collimated beam. Our smooth bore mounting adapters can be used to mount these parts.

SM2MP
The SM2MP OAP Mirror Adapter is externally SM2 threaded (2.035"-40), which allows a Ø2" OAP mirror to be directly mounted to an internally SM2-threaded component. The adapter is designed to allow easy adaptability to a 60 mm cage system as well as SM2-threaded mirror, translation, and rotation mounts. The included SM2RR retaining ring secures the adapter in place when it is threaded into a mount. An SPW604 and SPW801 Spanner Wrench can be used to thread the retaining ring and adapter, respectively. Three low profile 8-32 cap screws and the required 5/64" hex key are provided with each adapter.

MP508P1
The unthreaded MP508P1 OAP Mirror Adapter is sized to fit inside a Ø3" mirror mount, such as the KS3 Mirror Mount shown above. Three standard 8-32 cap screws and the required 9/64" hex key are provided with each adapter.

MP508P2(/M)
The MP508P2(/M) OAP Mirror Adapter contains four 8-32 (M4) taps, for post mounting, that orient the OAP mirror at right angles. The distance from the center of the optic to the edge of the mount in the MP508P2 is 1.5" (38.1 mm), allowing for standardized optical axis heights when used with a fixed height post, such as our Ø1" Posts. Please note that the MP508P2(/M) is not compatible with Ø3" mirror mounts, and is instead designed for post mounting. Three standard 8-32 cap screws and the required 9/64" hex key are provided with each adapter.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
MP508P2 Support Documentation
MP508P28-32-Threaded Adapter for Ø2" Off-Axis Parabolic Mirrors
$35.44
Today
+1 Qty Docs Part Number - Universal Price Available
SM2MP Support Documentation
SM2MPExternally SM2-Threaded Adapter for Ø2" Off-Axis Parabolic Mirrors
$37.61
Today
MP508P1 Support Documentation
MP508P13" Outer Diameter Adapter for Ø2" Off-Axis Parabolic Mirrors
$33.28
Today
+1 Qty Docs Part Number - Metric Price Available
MP508P2/M Support Documentation
MP508P2/MM4-Threaded Adapter for Ø2" Off-Axis Parabolic Mirrors
$35.44
Today

Ø3" Off-Axis Parabolic Mirror Mounting Adapter

SM1A7 alignment target mounted in SM2MP3 OAP Mirror Adapter
Click to Enlarge

Rear View of the SM2MP3 Adapter with an SM1A7 Alignment Target Mounted in the SM1-Threaded Bore
OAP Mirror mounted on a post using SM2MP Adapter
Click to Enlarge

MPD369V-M01 Ø3" OAP Mirror Mounted on a Ø1" Post Using an SM2MP3 Adapter
Off-axis parabolic Mirror Mounted on 6-axis mount using SM2MP Adapter
Click to Enlarge

Ø3" OAP Mirror Threaded into a K6X2 6-Axis Locking Kinematic Mount Using an SM2MP3 Adapter
  • Contains Three 8-32 Captive Screws and an Alignment Dowel for Mounting to Ø3" OAP Mirrors
  • External SM2 Threading for Mounting in Ø2" Mirror Mounts
  • Post Mountable in Four Orientations
  • Center Hole for Through Beams Parallel to Collimated Beams
  • Internal SM1-Threaded Bore for Mounting Alignments Targets

The SM2MP3 Mounting Adapter for Ø3" Off-Axis Parabolic Mirrors offers a mounting alternative to our smooth bore kinematic mirror mounts. External SM2 threading (2.035"-40) provides a mechanically stable option for mounting Ø3" OAP mirrors into an internally SM2-threaded component. Two holes spaced 1.5" apart on the back can be used to secure the adapter with an SPW801 adjustable spanner wrench. The SM2MP3 adapter also contains four 8-32 taps, for post mounting, that orient the OAP mirror at right angles. Thorlabs offers a selection of screw thread adapters, including the AP8E4M 8-32 to M4 thread adapter, which can be used to mount the SM2MP3 adapter onto M4-threaded posts.

This adapter contains three 8-32 captive screws that are positioned to align with the 8-32 tapped holes on our Ø3" OAP mirrors. Captive screws can be secured with a 5/64" (2 mm) hex key (not included). The SM2MP3 adapter also features a radial alignment slot for use with the included dowel pin to assist when mounting to a mirror. A Ø0.16" (Ø4 mm) through hole at the center of the SM2MP3 adapter provides passage for a through beam parallel to the collimated beam. The back side features an internal SM1-threaded (1.035"-40) bore for mounting externally SM1-threaded alignment tools, such as the SM1A7 alignment disk pictured above to the far right.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
SM2MP3 Support Documentation
SM2MP3Externally SM2-Threaded Adapter for Ø3" Off-Axis Parabolic Mirrors
$71.00
Today
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