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Mounted Penta Prism


  • 90° Deviation of Beam or Image without Changing Polarization Handedness
  • N-BK7 Prism with Aluminum-Coated Reflective Faces
  • 30 mm Cage Cube Mount with SM1-Threaded Ports

CCM1-PS932

Penta Prisms Deviate the Incident Light by 90° without Inverting or Reversing the Image

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Penta-Prism Cage Compatibility
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Mounted Penta Prisms are Compatible with Thorlabs' 30 mm Cage System
Penta-Prism Cage Compatibility
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The CCM1-PS932(/M) features two SM1-threaded ports and has two closed sides to minimize light leakage.
Optic Cleaning Tutorial

Features

  • Deviate Beams without Reversal or Inversion of the Beam Profile
  • 90º Beam Deviation is Insensitive to Beam/Prism Alignment
  • N-BK7 Prism with Aluminum-Coated Reflective Faces
  • Post Mountable and 30 mm Cage System Compatible
  • Compatible with SM1-Threaded (1.035"-40) Components

Penta prisms deviate incident light by 90° without inverting or reversing the image (i.e., without changing the polarization handedness). Additionally, the 90° image deviation is independent of the orientation of the prism with respect to the incident beam or image, making penta prisms an effective alternative to turning mirrors. The only limitation on alignment is the >Ø12 mm clear aperture of the housing.

Thorlabs' Mounted Penta Prism is fabricated from N-BK7 with two aluminized reflective faces protected by an Inconel and black paint overcoat. It features a clear aperture of >Ø12 mm and is mounted inside a standard 30 mm cage system cage cube. The prism is epoxied within a cage cube mount and cannot be removed. Note that the beam exits the cage cube mount at 90° ± 20 arcmin. 

The housing provides an 8-32 (M4) tap for post mounting, SM1-threaded (1.035"-40) input and output ports, and eight 4-40-tapped holes for cage rods on the entrance and exit faces. The CCM1-PS932(/M) features two SM1-threaded ports and has two closed sides to minimize light leakage. The penta prism cage cube can also be connected to other cage cubes using cage rods and ERSCA adapters. For a complete selection of our cube-mounted optics please see the Mounted Optics Guide tab.

We also offer 10, 20, 40, and 60 mm unmounted penta prisms. Empty 30 mm cage cubes are available for mounting our 20 mm unmounted penta prism.

Specifications
Prism Material N-BK7a
Unmounted Prism PS932
Reflective Coating Aluminum with Inconel
and Black Paint Overcoat
Clear Aperture >Ø12 mmb
Surface Flatness <λ/10 at 633 nm
Surface Quality 40-20 Scratch-Dig
Angular Tolerances ±1 arcmin
Reflected Beam Anglec 90° ± 20 arcmin
Prism Dimensions A = B = C = 20 mm
L= L= 28.3 mm
Dimensional Tolerance ±0.1 mm
  • Click Link for Detailed Specifications on the Substrate Glass
  • The clear aperture of the mounted prism is limited by the housing.
  • The deviation of a beam exiting the prism is ±1 arcmin, whereas the deviation of the beam exiting the prism when mounted in the housing is ±20 arcmin.
Transmission of Uncoated N-BK7
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Click Here to Download Raw Data

Prism Dimension Schematic

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.

30 mm Cage-Cube-Mounted Optics Selection Guide

The table below provides links to all of our 30 mm Cage-Cube-Mounted optics. For our selection of 16 mm Cage-Cube-Mounted Optics, please see our 16 mm Cage Systems guide.

Non-Polarizing Beamsplitters Polarizing Beamsplitters High Power Polarizing Beamsplitters
Non-Polarizing Beamsplitter Cube Polarizing Beamsplitter Cube High-Power Polarizing Beamsplitter Cube
Pellicle Beamsplitter Laser Line Polarizing Beamsplitters Circular Polarizer
Pellicle Beamsplitters Laser Line Polarizing Beamsplitter Cube Circular / Variable Polarizers
Penta Prisms Turning Mirrors Variable Beamsplitters/Attenuators
Penta Prisms Turning Mirrors Variable Beamsplitters / Attenuators

30 mm Cage Cube Empty Optic Mounts Selection Guide

Dichroic Mirror Holder Empty Compact Cage Cube
Rectangular Dichroic Mirrors and Filters Empty Compact 30 mm Cage Cube

Posted Comments:
user  (posted 2017-06-14 19:25:59.073)
I understand the prism is epoxied to the mount, but can the two parts of the mount still be separated? I would like the prism (with one half of the mount) to be removable from my optical setup.
tfrisch  (posted 2017-06-26 04:09:50.0)
Hello, thank you for contacting Thorlabs. The cage on top of the base can be removed by removing the 4 screws along the bottom of the cage. This would mean the setup would have to be attached to the cage and the base could drop out if you do not post mount the base. Please reach out to TechSupport@Thorlabs.com if you would like to discuss further.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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