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Round Wedge Prisms


  • Used Primarily in Laser Beam Steering Applications
  • Available with Three Broadband AR Coatings
  • Material: N-BK7, Grade A
  • Surface Flatness: λ/10

PS814

PS810

PS812

Application Idea

PS814 Prism Mounted in a PRM1 Rotation Mount Using an SM1W189 Shim and SM1RR Retaining Ring

SM1W189

Mounting Shim for PS814

Related Items


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Application Idea: Beam Steering

Wedge prisms are designed to be used individually or in a pair for beam steering applications. This is done by individually controlling the rotation of each prism. See the Application Idea tab for more details.

Mounting Shim
Click to Enlarge
View Product List
Item #QtyDescription
SM1L30C1SM1 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
SM1W11221Wedge Prism Mounting Shim, 11° 22' Wedge Angle
PS8121Ø1" Round Wedge Prism, 6° Beam Deviation, Uncoated
SM1W1122 Mounting Shim Being Used with an SM1RR Retaining Ring to Mount a PS812 Prism in an SM1 Lens Tube

Thorlabs' Wedge Prisms are ideal for laser beam steering applications. Also known as Risley prisms, these optics deflect a beam normal to the prism's perpendicular surface through an angular deviation ranging from 2° to 10°. Please refer to the Wedged Prism Specs tab for the angular deviation of each wedge prism. Thorlabs' wedge prisms can be purchased uncoated or coated with one of three standard broadband AR coatings.

Wedge prisms can be used individually or in combination with another wedge prism for beam steering. For more details and to see a sample application, click on the Application Idea tab above.

Mounting
Mounting Shims are offered below to provide a flat, uninterrupted mounting surface between a wedge prism and one of our retaining rings. These shims have a wedge on one side to ensure that the optic is properly mounted within an SM1 lens tube or rotation mount when secured with a retaining ring. 

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.
Optic Cleaning Tutorial
General Specifications
Material N-BK7a
Dimensional Tolerance ±0.15 mm
Diameter 25.4 mm +0.0/-0.3 mm
Clear Aperture >80% of Diameter
Angular Tolerance ±30 arcsec
Surface Quality of Polished Surfaces 40-20 Scratch-Dig
Surface Flatness λ/10 at 633 nm
Design Wavelength 633 nm
Thin Edge of Wedge 3.00 mm
AR Coating -A 350 - 700 nm
-B 650 - 1050 nm
-C 1050 - 1700 nm
  • Click Link for Detailed Specifications on the Substrate Glass
Wedge Prism
Item # Angular
Deviation
Thickness (T) (mm) Wedge Angle Powera (Diopter) Compatible Mounting Shim
PS810 4.72 3° 53' 3.5 SM1W353
PS811 6.43 7° 41' 7.0 SM1W741
PS812 8.11 11° 22' 10.5 SM1W1122
PS814 10° 11.33 18° 9' 17.4 SM1W189
  • The power is a measure of the amount of beam deviation. One Diopter is equal to 1 cm of beam deviation when measured at a 1 m distance from the prism.
B AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 650 - 1050 nm wavelength range for optimum performance.
A AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance.
C AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 1050 - 1700 nm wavelength range for optimum performance.
N-BK7 Window Transmission
Click to Enlarge

Click Here for Raw Data

Thorlabs' Standard Broadband Antireflection Coatings

Button to Download an Excel Spread Sheet to Demonstrate a Risley Prism Scanner
Button to Download a pdf to learn about Risley Prism Scanners

Application Ideas


Introduction and Setup
Wedge prisms are designed to be used, either individually or in a pair, for beam steering applications. This is done by individually controlling the rotation of each prism using our PRM1Z8 motorized rotation stages. The tables below correspond to either the imperial or metric product list for the configuration pictured to the right. Clicking on the item number will bring up a pop-up window with more information about that component.

An Application Note was prepared to describe this process in further detail, and will be referenced periodically here. For a full download of the Application Note, click the button at the upper right of this tab. To the upper right is also a download for an Excel spreadsheet which can be used to model a Risley Prism Scanner.

Item #QtyDescription
Imperial Product List
PS814-A2Wedge Prism with 10° Wedge Angle
SM1W1892Wedge Prism Mounting Shim
PRM1Z82Motorized Rotation Mount
KDC1012K-Cube Brushed DC Servo Motor Controllera
KPS101215 V, 2.4 A Power Supply Unit for One K-Cube or T-Cube
LDM6351635 nm Laser Diode Module
KM200V1Kinematic V-Groove Mount
TR33Ø1/2" Post, 3" Long
PH33Ø1/2" Post Holder, 3" Long
BA21Post Holder Base
BA11Post Holder Base
MB81Aluminum Breadboard
Item #QtyDescription
Metric Product List
PS814-A2Wedge Prism with 10° Wedge Angle
SM1W1892Wedge Prism Mounting Shim
PRM1/MZ82Motorized Rotation Mount
KDC1012K-Cube Brushed DC Servo Motor Controllera
KPS101215 V, 2.4 A Power Supply Unit for One K-Cube or T-Cube
LDM6351635 nm Laser Diode Module
KM200V/M1Kinematic V-Groove Mount
TR75/M3Ø12.7 mm Post, 75 mm Long
PH75/M3Ø12.7 mm Post Holder, 75 mm Long
BA2/M1Mounting Base
BA1/M1Mounting Base
MB2020/M1Aluminum Breadboard
  • The photo to the right shows a previous generation TDC001 T-Cube.


Tracing a Circle with One Prism
For this application, only one prism was mounted in a rotation mount. The incoming beam was deviated off axis by the wedge prism. Once the rotation mount was activated, the wedge prism was spun about the optical axis, which caused the deviated beam to trace out a small circle, as shown in the long-exposure photogrpah to the right. The radius of this circle can be calculated as:

This is equation 9 in the Applciation Note linked above. In this equation r' is this circle's radius, S is the distance from the last surface of the prism to the scanning surface, T is the center thickness of the prism, Φo is the beam angle relative to the original optical axis after exiting the second surface of the prism, Φi is the angle created from the beam's incidence on the first surface of the prism according to Snell's Law, and Φp is the resulting angle the beam takes inside the prism relative to the first surface's normal according to Snell's Law. 


Tracing a Circle with Two Prisms
For this application, the rotation mounts are set so that the wedges of both prisms are aligned to the home position, where both prisms' thickest sections are vertical. Since each prism will deviate the beam by the deviation angle, the total beam deviation for two prisms with the wedges aligned will be approximately twice the size. If both prisms are rotated at the same rate and in the same direction, the beam will trace out a circle which is approximately twice the size of the circle traced out by a single prism. The long-exposure photograph to the right was taken with the prism assembly at the same distance from the screen as the one-prism circle above. Notice that the circle in the two-prism case is about twice the diameter of the one formed with one prism. The radius of this circle can be calculated as: 

This is equation 18 in the Applciation Note linked above. In this parametric equation, rmax is the radius of this circle (any subsequent shape created by this setup is enclosed by this radius), T is the middle thickness of the fist prism, T' is the effective thickness of prism 2 after the deviated beam travels through it, Φi is the angle created from the beam's incidence on the first surface of the fist prism according to Snell's Law, Φp is the resulting angle the beam takes inside the prism relative to the first surface's normal according to Snell's Law, z is the distance from the second surface of the second prism to the scanning surface, S is the distance between the prisms, and Φo is the beam angle relative to the original optical axis after exiting the second surface of the first prism.


Tracing a Spiral with Two Prisms
It can be shown that a large variety of shapes can be traced while rotating the two prisms at constant speeds. These shapes are dictated by the equation:

This is equation 21 in the Applciation Note linked above; please reference that Applciation Note or the accompanying spreadsheet for the definitions of these variables. As an example, the long-exposure photograph to the right shows two wedge prisms being used to trace out a spiral. This was realized by first setting the beam to be undeviated, and then having the prisms rotate in the same direction, with one prism set to rotate 0.5 deg/s faster than the other. This, and many other shapes, can be created on the "Third Approx." sheet of the downloadable Excel sheet above. To create this spiral, try inputting 25 deg/s to ω1 (rotation speed of prism 1), 24.5 deg/s to ω2 (rotation speed of prism 2), and 80 seconds to t (run time), with a Δθ (home position offest) of 180 degrees.


Posted Comments:
user  (posted 2017-11-02 15:47:22.733)
It would be very helpful with orientation if the thinnest part of prism was marked on the edge of the optic.
nbayconich  (posted 2017-11-15 04:34:57.0)
Thank you for contacting Thorlabs. We can provide these prisms with markings upon request. For more information about quoting customized optics please provide us your e-mail address or contact us at techsupport@thorlabs.com
a.kuhn  (posted 2017-07-03 10:50:56.3)
Hello, can you supply the wedge prism in fused silica rather than BK7? Regards Andreas
nbayconich  (posted 2017-07-27 08:17:48.0)
Thank you for contacting Thorlabs. I will reach out to you directly about our custom capabilities.
sergepl  (posted 2016-09-06 02:02:11.15)
In PS810 PDF drawing specified wrong thickness 4.2mm instead of 4.72mm.
tfrisch  (posted 2016-09-08 08:49:37.0)
Hello, thank you for pointing out the inconsistency between our drawing and spec. We are working on updating to the correct information in all sources.
Avenellj  (posted 2015-12-16 12:27:21.757)
Can I get a prism wedge in 0.54 degrees
besembeson  (posted 2015-12-16 03:49:41.0)
Response from Bweh at Thorlabs USA: Thanks for contacting Thorlabs. I will follow-up regarding quoting this special for you.
cesar.eduardo.garza.lozano  (posted 2014-05-19 15:20:55.5)
PS810 product do not show any information about the refractive index acordnig to wavelenght. what isthe refractive index of PS810 if i would use a 808nm laser? thanks in advance Cesar Garza
myanakas  (posted 2014-05-19 12:47:50.0)
Response from Mike at Thorlabs: Thank you for your feedback. We are currently working to have this information available on our wedge prism page. The index of refraction of N-BK7, which is the glass used for our wedge prisms, at 808 nm is about 1.51. If you need more information, a full presentation of all of our optical substrates, including N-BK7, can be found here: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6973. I have also contacted you directly.
strangek  (posted 2013-07-23 16:17:39.213)
What is the transmitted wavefront distortion of these prisms? Thanks
cdaly  (posted 2013-07-24 16:34:00.0)
Response from Chris at Thorlabs: Thank you for your feedback. We do not have a tested value for the transmitted wave front error, but with a surface flatness value of lamda/10. The worst case should not be any higher than lamda/5, not accounting for tilt due to the wedge.
bdada  (posted 2011-11-04 11:04:00.0)
Response from Buki at Thorlabs: Thank you for participating in our Feedback Forum. You can fill the area of the circle by rotating the 2 prisms. One prism gives you the ability to rotate and generate a hollow cone angle, while two prims will double your angular deviation and allow you to hit any point within that solid cone angle. In this case, the proper rotation of the 2 prisms would allow you to trace the path of an archimedes' spiral. We will update the image on our website to make this clearer.
yannick.sudrie  (posted 2011-11-02 00:19:13.0)
Dear sir, there is something i do not understand about your Wedge Prism overwiew. I can read :"As both Wedges are rotated, the area of a circle is filled." I am trying to find a way to plot an archimedes' spiral with a laser and i am not sure i am be able to do this with your two wedges prism; would you clarifi this point please does it mean : - it's possible to plot a spot every where inside the area of a circle on the cone base ? ex : if 4xtheta = circle diameter = 1 and i wana plot a spot at coordinated (0;0) the center or (0;0.5)on the edge ... i will be able to put the plot where i want inside the circle area build by the cone if i am 'playing' with two prisms' angles from 0 to 2pi. OR - I can only put a plot on 4xtheta = circle diameter = 1 on the circle edge line only ? thanks for your help. sudrie
Thorlabs  (posted 2010-11-05 22:27:09.0)
Response from Javier at Thorlabs to eee: Thank you very much for your feedback. We currently do not offer mounting rings specifically designed for the wedge prisms. However, in order to mount one of these prisms onto the PRM1, you can use (4) ER cage rods and the ARV1 cage clamp. Links below: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=180 http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=1330&pn=ARV1
eee  (posted 2010-11-05 09:08:00.0)
What about mounting ? It would be nice if each of these wedged prisms would have a complementary wedged metallic ring included, e.g. for mounting in PRM1.

Selection Guide for Prisms

Thorlabs offers a wide variety of prisms, which can be used to reflect, invert, rotate, disperse, steer, and collimate light. For prisms and substrates not listed below, please contact Tech Support.

Beam Steering Prisms

Prism Material Deviation Invert Reverse or Rotate Illustration Applications
Right Angle Prisms N-BK7, UV Fused Silica, Calcium Fluoride, or Zinc Selenide 90° 90° No  1

90° reflector used in optical systems such as telescopes and periscopes.

180° 180° No  1

180° reflector, independent of entrance beam angle.

Acts as a non-reversing mirror and can be used in binocular configurations.

Unmounted Retroreflectors
and
Mounted Retroreflectors

N-BK7 180° 180° No  Retroreflector

180° reflector, independent of entrance beam angle.

Beam alignment and beam delivery. Substitute for mirror in applications where orientation is difficult to control.

Unmounted Penta Prisms
and
Mounted Penta Prisms
N-BK7 90° No No  1

90° reflector, without inversion or reversal of the beam profile.

Can be used for alignment and optical tooling.

Roof Prisms N-BK7 90° 90° 180o Rotation  1

90° reflector, inverted and rotated (deflected left to right and top to bottom).

Can be used for alignment and optical tooling.

Unmounted Dove Prisms
and
Mounted Dove Prisms
N-BK7 No 180° 2x Prism Rotation  1

Dove prisms may invert, reverse, or rotate an image based on which face the light is incident on.

Prism in a beam rotator orientation.

180° 180° No  1

Prism acts as a non-reversing mirror.

Same properties as a retroreflector or right angle (180° orientation) prism in an optical setup.

Wedge Prisms N-BK7 Models Available from 2° to 10° No No  1

Beam steering applications.

By rotating one wedged prism, light can be steered to trace the circle defined by 2 times the specified deviation angle.

No No  Wedge Prism Pair

Variable beam steering applications.

When both wedges are rotated, the beam can be moved anywhere within the circle defined by 4 times the specified deviation angle.

Coupling Prisms Rutile (TiO2) or GGG Variablea No No  Coupling Prism

High index of refraction substrate used to couple light into films.

Rutile used for nfilm > 1.8

GGG used for nfilm < 1.8

  • Depends on Angle of Incidence and Index of Refraction


Dispersive Prisms

Prism Material Deviation Invert Reverse or Rotate Illustration Applications
Equilateral Prisms F2, N-SF11, Calcium Fluoride,
or Zinc Selenide
Variablea No No  

Dispersion prisms are a substitute for diffraction gratings.

Use to separate white light into visible spectrum.

Dispersion Compensating Prism Pairs Fused Silica, Calcium Fluoride, SF10, or N-SF14 Variable Vertical Offset No No  Dispersion-Compensating Prism Pair

Compensate for pulse broadening effects in ultrafast laser systems.

Can be used as an optical filter, for wavelength tuning, or dispersion compensation.

 

Pellin Broca Prisms N-BK7,
UV Fused Silica,
or Calcium Fluoride
90° 90° No  1

Ideal for wavelength separation of a beam of light, output at 90°.

Used to separate harmonics of a laser or compensate for group velocity dispersion.

  • Depends on Angle of Incidence and Index of Refraction

Beam Manipulating Prisms

Prism Material Deviation Invert Reverse or Rotate Illustration Applications
Anamorphic Prism Pairs N-KZFS8 or
N-SF11
Variable Vertical Offset No No  1

Variable magnification along one axis.

Collimating elliptical beams (e.g., laser diodes)

Converts an elliptical beam into a circular beam by magnifying or contracting the input beam in one axis.

Axicons UV Fused Silica Variablea No No  1

Creates a conical, non-diverging beam with a Bessel intensity profile from a collimated source.

  • Depends on Prism Physical Angle

Polarization Altering Prisms

Prism Material Deviation Invert Reverse or Rotate Illustration Applications
Glan-Taylor, Glan-Laser, and α-BBO Glan-Laser Polarizers Glan-Taylor:
Calcite

Glan-Laser:
α-BBO or Calcite
p-pol. - 0°

s-pol. - 112°a
No No  Glan-Taylor Polarizer

Double prism configuration and birefringent calcite produce extremely pure linearly polarized light.

Total Internal Reflection of s-pol. at the gap between the prism while p-pol. is transmitted.

Rutile Polarizers Rutile (TiO2) s-pol. - 0°

p-pol. absorbed by housing
No No  Rutile Polarizer Diagram

Double prism configuration and birefringent rutile (TiO2) produce extremely pure linearly polarized light.

Total Internal Reflection of p-pol. at the gap between the prisms while s-pol. is transmitted.

 

Double Glan-Taylor Polarizers Calcite p-pol. - 0°

s-pol. absorbed by housing
No No  Glan-Taylor Polarizer

Triple prism configuration and birefringent calcite produce maximum polarized field over a large half angle.

Total Internal Reflection of s-pol. at the gap between the prism while p-pol. is transmitted.

Glan Thompson Polarizers Calcite p-pol. - 0°

s-pol. absorbed by housing
No No  Glan-Thompson Polarizer

Double prism configuration and birefringent calcite produce a polarizer with the widest field of view while maintaining a high extinction ratio.

Total Internal Reflection of s-pol. at the gap between the prism while p-pol. is transmitted.

Wollaston Prisms and
Wollaston Polarizers
Quartz, Magnesium Fluoride, α-BBO, Calcite, Yttrium Orthovanadate Symmetric
p-pol. and
s-pol. deviation angle
No No  Wollaston Prism

Double prism configuration and birefringent calcite produce the widest deviation angle of beam displacing polarizers.

s-pol. and p-pol. deviate symmetrically from the prism. Wollaston prisms are used in spectrometers and polarization analyzers.

Rochon Prisms Magnesium Fluoride
or
Yttrium Orthovanadate
Ordinary Ray: 0°

Extraordinary Ray: deviation angle
No No

Double prism configuration and birefringent MgF2 or YVO4 produce a small deviation angle with a high extinction ratio.

Extraordinary ray deviates from the input beam's optical axis, while ordinary ray does not deviate.

Beam Displacing Prisms Calcite 2.7 or 4.0 mm Beam Displacement No No  Beam Displacing Prism

Single prism configuration and birefringent calcite separate an input beam into two orthogonally polarized output beams.

s-pol. and p-pol. are displaced by 2.7 or 4.0 mm. Beam displacing prisms can be used as polarizing beamsplitters where 90o separation is not possible.

Fresnel Rhomb Retarders N-BK7 Linear to circular polarization

Vertical Offset
No No  Fresnel Rhomb Quarter Wave

λ/4 Fresnel Rhomb Retarder turns a linear input into circularly polarized output.

Uniform λ/4 retardance over a wider wavelength range compared to birefringent wave plates.

Rotates linearly polarized light 90° No No  Fresnel Rhomb Half Wave

λ/2 Fresnel Rhomb Retarder rotates linearly polarized light 90°.

Uniform λ/2 retardance over a wider wavelength range compared to birefringent wave plates.

  • s-polarized light is not pure and contains some p-polarized reflections.

Beamsplitter Prisms

Prism Material Deviation Invert Reverse or Rotate Illustration Applications
Beamsplitter Cubes N-BK7 50:50 splitting ratio, 0° and 90°

s- and p- pol. within 10% of each other
No No  Non-polarizing Beamsplitter

Double prism configuration and dielectric coating provide 50:50 beamsplitting nearly independent of polarization.

Non-polarizing beamsplitter over the specified wavelength range.

Polarizing Beamsplitter Cubes N-BK7, UV Fused Silica, or N-SF1 p-pol. - 0°

s-pol. - 90°
No No  Polarizing Beamsplitter Cube

Double prism configuration and dielectric coating transmit p-pol. light and reflect s-pol. light.

For highest polarization use the transmitted beam.

Round Wedge Prisms, 2° Beam Deviation

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PS810 Support Documentation
PS810Ø1" Round Wedge Prism, 2° Beam Deviation, Uncoated
$34.43
Today
PS810-A Support Documentation
PS810-AØ1" Round Wedge Prism, 2° Beam Deviation, AR Coating: 350 - 700 nm
$44.12
Today
PS810-B Support Documentation
PS810-BØ1" Round Wedge Prism, 2° Beam Deviation, AR Coating: 650 - 1050 nm
$44.12
Today
PS810-C Support Documentation
PS810-CØ1" Round Wedge Prism, 2° Beam Deviation, AR Coating: 1050 - 1700 nm
$47.43
Today

Round Wedge Prisms, 4° Beam Deviation

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PS811 Support Documentation
PS811Ø1" Round Wedge Prism, 4° Beam Deviation, Uncoated
$34.43
Today
PS811-A Support Documentation
PS811-AØ1" Round Wedge Prism, 4° Beam Deviation, AR Coating: 350 - 700 nm
$44.12
Today
PS811-B Support Documentation
PS811-BØ1" Round Wedge Prism, 4° Beam Deviation, AR Coating: 650 - 1050 nm
$44.12
Today
PS811-C Support Documentation
PS811-CØ1" Round Wedge Prism, 4° Beam Deviation, AR Coating: 1050 - 1700 nm
$47.43
Today

Round Wedge Prisms, 6° Beam Deviation

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PS812 Support Documentation
PS812Ø1" Round Wedge Prism, 6° Beam Deviation, Uncoated
$34.43
Today
PS812-A Support Documentation
PS812-AØ1" Round Wedge Prism, 6° Beam Deviation, AR Coating: 350 - 700 nm
$44.12
Today
PS812-B Support Documentation
PS812-BØ1" Round Wedge Prism, 6° Beam Deviation, AR Coating: 650 - 1050 nm
$44.12
Today
PS812-C Support Documentation
PS812-CØ1" Round Wedge Prism, 6° Beam Deviation, AR Coating: 1050 - 1700 nm
$47.43
Today

Round Wedge Prisms, 10° Beam Deviation

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PS814 Support Documentation
PS814Ø1" Round Wedge Prism, 10° Beam Deviation, Uncoated
$34.43
3-5 Days
PS814-A Support Documentation
PS814-AØ1" Round Wedge Prism, 10° Beam Deviation, AR Coating: 350 - 700 nm
$44.12
Today
PS814-B Support Documentation
PS814-BØ1" Round Wedge Prism, 10° Beam Deviation, AR Coating: 650 - 1050 nm
$44.12
3-5 Days
PS814-C Support Documentation
PS814-CØ1" Round Wedge Prism, 10° Beam Deviation, AR Coating: 1050 - 1700 nm
$47.43
Today

Ø1" Wedge Prism Mounting Shims

Mounting Shim
Click for Details

Four Wedge Angles are Available that Match our Wedged Prisms
Mounting Shim
Click to Enlarge

Each Shim Includes Engraved Witness Lines and Spanner Wrench Slots
  • Mount Ø1" Wedge Prisms in SM1-Threaded Lens Tubes or Rotation Mounts
  • Four Wedge Angles Available to Match Our Wedge Prisms:
    • 3° 53' for PS810 Wedge Prisms
    • 7° 41' for PS811 Wedge Prisms
    • 11° 22' for PS812 Wedge Prisms
    • 18° 9' for PS814 Wedge Prisms
  • Mount Planar Optics at an Angle Within an SM1 Lens Tube
  • Spanner Wrench Slots for Easy Positioning
Mounting Shim
Click to Enlarge
The left image shows one shim being used to mount a wedge prism, while the right image shows two shims being used to mount a filter at an angle to reduce back reflections. An SM1L30C slotted lens tube is used to help confirm the proper fit.

Thorlabs' Wedge Prism Mounting Shims are designed to provide a flat, uninterrupted mounting surface between a Ø1" wedge prism and one of our retaining rings. Normally a retaining ring will only contact a small portion of the wedged optic, potentially causing incorrect seating or unexpected shifts. These shims have a wedge on one side to ensure that the wedged optic is properly mounted within an SM1 lens tube or rotation mount when secured with a retaining ring. The shim does not impinge upon the clear aperture of our wedge prisms, as shown in the drawings to the right. Four shims are available, each with a wedge angle that matches one of our wedge prisms: 3° 53', 7° 41', 11° 22', or 18° 9'.

Each mounting shim has two slots for compatibility with our SPW602 and SPW606 Spanner Wrenches. When aligning these rings within an SM1 lens tube or mount, we recommend holding the mount or lens tube vertically while using a spanner wrench to roughly align the shim's wedge against the optic. When roughly aligned, tighten the retaining ring down until it binds and then slightly loosen it. Alternate between tightening and loosening the retaining ring until the shim and optic are well aligned with one another. Then secure the optic and shim with the retaining ring.

In addition, these shims can be used in pairs to mount Ø1" planar optics, such as filters or windows, at a predefined angle within an SM1 lens tube to reduce back reflections. Simply place the filter between two shims with the same wedge angle and follow the mounting instructions recommended above. When mounting planar optics with this method the optic thickness is critical. The maximum optic thickness is 6 mm when using two SM1W353 mounting shims, or 1 mm when using two SM1W741 or SM1W1122 mounting shims. Due to its large wedge angle, we do not recommend mounting planar filters with the SM1W189. Regardless of the optic thickness, the optic diameter is not large enough, which creates a gap that can allow unfiltered light through.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1W353 Support Documentation
SM1W353Wedge Prism Mounting Shim, 3° 53' Wedge Angle
$16.63
Today
SM1W741 Support Documentation
SM1W741Wedge Prism Mounting Shim, 7° 41' Wedge Angle
$16.63
Today
SM1W1122 Support Documentation
SM1W1122Wedge Prism Mounting Shim, 11° 22' Wedge Angle
$16.73
Today
SM1W189 Support Documentation
SM1W189Wedge Prism Mounting Shim, 18° 9' Wedge Angle
$16.83
Today
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