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Mounted Glan-Thompson Polarizers


  • Wide Field of View: 40° Typical
  • Highest Grade Optical Calcite
  • Ø1/2" or Ø1" Outer Diameter Mount
  • Uncoated and AR-Coated Versions Available

GTH10M-B

GTH5M-A

Application Idea

GTH10M, SM1L20
Lens Tube, and
RSP1 Rotation
Mount Assembly

Related Items

Item #GTH5M(-A)(-B)GTH10M(-A)(-B)
Extinction Ratioa 100,000:1
Material High-Optical-Grade Calcite
Wavefront
Distortion
≤λ/4 Over Clear Aperture
Surface Qualityb 20-10 Scratch-Dig
Wavelength Range 350 nm to 2.3 µm
Aperture 5 mm x 5 mm 10 mm x 10 mm
Substrate Calcitec
Dimensions
A 21.6 mm 36.6 mm
B 12.7 mm 25.4 mm
  • The extinction ratio (ER) is the ratio of the maximum transmission of a linear polarized signal when the polarizer's axis is aligned with the signal to the minimum transmission when the polarizer is rotated by 90°.
  • For input and output faces. The side ports have 80-50 scratch-dig surface quality.
  • Click Link for Detailed Specifications on the Substrate
Warning: Calcite is a temperature-sensitive crystal and will crack if it is exposed to thermal shock. Allow the shipping packaging to reach complete thermal equilibrium before opening (6 - 8 hours).
GT Mounted Drawing

Features

  • Wide Field of View: 40° Typical
  • High Extinction Ratio: 100,000:1
  • 350 nm to 2.3 μm Operation for Uncoated Prisms
  • AR-Coated Versions for 350 - 700 nm or 650 - 1050 nm Range
  • Highest Grade Optical Calcite
  • Cemented Prisms
  • Damage Threshold: 1 W/cm2

Thorlabs' Mounted Glan-Thompson calcite polarizers offer the widest field of view of the calcite polarizers while maintaining a high extinction ratio. The mounts consist of a black aluminum housing; unmounted versions are also available. The mounted GTH5M polarizer has a 1/2" outer diameter and can be conveniently held inside our SM05L10 lens tube. This allows the user to easily mount this polarizer to a rotation stage, such as the PRM05 Precision Rotation Mount for Ø1/2" optics. A similar option is available for the 1" outer diameter GTH10M mounted polarizer, using the SM1L20 lens tube and PRM1 precision rotation mount. Please see the Mounting tab for more details.

Both uncoated and AR coated polarizers are available. The uncoated polarizers are designed for use in the 350 nm to 2.3 μm range, while coated versions offer Ravg < 1% per surface in the 350 - 700 nm or 650 -1050 nm wavelength range. Please see the Graphs tab for coating reflectivity data.

Glan-Thompson polarizers consist of two cemented prisms made from the highest optical grade of calcite. Unpolarized light enters the polarizer and is split at the interface between the two crystals. The ordinary rays are reflected at each interface, causing them to be scattered and partially absorbed by the polarizer housing. The extraordinary rays pass straight through the polarizer, providing a polarized output.

Note: As with all Glan-Thompson polarizers, the maximum optical intensity is limited by the cemented prism interface. For high-power applications, Thorlabs offers Glan-Laser polarizers, which can handle energy densities up to 20 J/cm2.

Glan Thompson Field of View Drawing

The transmission graph below shows the typical transmission of the GTH10 series of calcite Glan-Thompson polarizers, including any internal losses. The transmission is valid for linearly polarized light aligned with the mark on the housing of the polarizer. Calcite is a natural material, and thus transmission can vary significantly, particularly in the UV and IR. Consequently, the performance data shown below may vary from lot to lot and is not guaranteed.

Calcite AR Coating Reflectance
Click to Enlarge

An Excel file with Calcite AR coating data is also available.

Glan-Thompson Calcite Polarizer
Polarization-Dependent Refraction - Glan-Thompson Calcite Polarizer

Our calcite polarizers are all based on high-grade, birefringent calcite crystals. Due to the birefringent nature of calcite, waves polarized in the direction of the optical axis propagate with a different index of refraction than waves polarized orthogonally to the optical axis. In our mounted Glan-Thompson polarizers, this birefringence causes the selective reflection and absorption of one polarization state of an incident beam and the transmission of the other orthogonal polarization state. When unpolarized light is incident on the optic, extraordinary rays pass straight through the polarizer while ordinary rays are reflected at an angle that depends on the light's wavelength and the length of the polarizer. The reflected ordinary rays are then scattered and partially absorbed by the optic's housing, resulting in a highly polarized output.

A calcite polarizer can be designed as either a polarization splitter/combiner or as a polarizer element that removes the angled, orthogonally polarized component of a beam. Our calcite polarizers are typically built out of two prisms, as shown in the drawing to the right. Since calcite is a soft crystal that is easily damaged, almost all of our calcite polarizers are offered in metal housings. With convenient threadings and adapters, these housings can easily be mounted into our opto-mechanical products.

Field of View

Calcite polarizers feature a field of view (FOV) that varies with both wavelength and entrance orientation. The FOV of these prisms must be considered during alignment and collimation procedures.

The side that absorbs the ordinary ray has an FOV that decreases as the wavelength increases (FOV 1). The opposite side has an FOV that increases as the wavelength increases (FOV 2). The FOV of Glan-Thompson polarizers is typically greater than the FOV of Glan-Taylor polarizers.

Field of View
Calcite Polarizer Field of View (FOV)

Transmission

Thorlabs uses only the highest quality natural calcite in our polarizing prisms. Typical transmission curves for these polarizers may be found on the Graphs tab. Because calcite is a naturally occuring material, variations in the crystal affect the transmission curve and the damage threshold rating. Variations in the calcite transmission curve are typically limited to wavelengths > 2 μm, making calcite an excellent material to use in the visible and NIR.

Thorlabs' Calcite Polarizers
Glan-Laser Polarizers Glan-Taylor Polarizers Wollaston Polarizer
Mounted Glan-Thompson Polarizers
Unmounted Glan-Thompson Polarizers
Double Glan-Taylor Polarizer Beam Displacers
lens tube mounted to PRM1
Figure 2
inserting lens tube in PRM1
Figure 1
secure polarizer's position by using spanner wrench
Figure 4
inserting polarizer in lens tube
Figure 3

Mounting the GTH10M

The GTH10M polarizer can be mounted to a PRM1 rotation mount by using a SM1L20 lens tube:

  1. Remove the retaining rings that comes with the PRM1 rotation mount and the lens tube.
  2. Screw the threaded end of the lens tube into the rotation mount as shown in Figure 1.
  3. Once the lens tube is threaded (Figure 2), insert the mounted polarizer into the other end of the lens tube (see Figure 3)
  4. Secure the polarizer into place using the retaining ring included with the lens tube.
  5. A SPW602 spanner wrench can be used to tighten the retaining ring (Figure 4).

Note: The SM1P1 Ø1" to SM1 adapter can be used in place of the SM1L20 lens tube when space is not available for the extra length of the lens tube.

Mounting the GTH5M

The GTH5M can be mounted using the directions above for the GTH10M, except substituting Ø1/2" components for the Ø1" components used for the GTH10M. The chart below lists the equivalent item numbers appropriate for mounting the GTH5M.

DescriptionGTH10M Item # From AboveEquivalent GTH5M Item #
Rotation Mount PRM1 PRM05
Lens Tube SM1L20 SM05L10a
Spanner Wrench SPW602 SPW603
  • The SM05P05 Ø1/2" to SM05 adapter can be used in place of the SM05L10 lens tube when space is not available for the extra length of the lens tube.

Polarizer Selection Guide

Thorlabs offers a diverse range of polarizers, including wire grid, film, calcite, alpha-BBO, rutile, and beamsplitting polarizers. Collectively, our line of wire grid polarizers offers coverage from the visible range to the beginning of the Far-IR range. Our nanoparticle linear film polarizers provide high thresholds for laser damage, up to 25 W/cm2, as well as extinction ratios as high as 100,000:1. Alternatively, our other film polarizers offer an affordable solution for polarizing light from the visible to the Near-IR. Next, our beamsplitting polarizers allow for use of the reflected beam, as well as the more completely polarized transmitted beam. Finally, our Alpha-BBO (UV), calcite (visible to Near-IR), and rutile (Near-IR to Mid-IR) polarizers each offer an exceptional extinction ratio of 100,000:1 within their respective wavelength ranges.

To explore the available types, wavelength ranges, extinction ratios, transmission, and available sizes for each polarizer category, click More [+] in the appropriate row below.

Wire Grid Polarizers
Film Polarizers
Beamsplitting Polarizers
alpha-BBO Polarizers
Polarizer Type Wavelength Range Extinction Ratio Transmissiona Available Sizes
alpha-BBO Glan-Laser Polarizers 210 nm - 450 nm 100,000:1 5 mmb and 10 mmb
(Clear Aperture, Square)
220 nm - 370 nm
405 nm
Calcite Polarizers
Polarizer Type Wavelength Range Extinction Ratio Transmissiona,g Available Sizes
Glan-Laser Calcite Polarizers 350 nmf - 2.3 µm (Uncoated) 100,000:1 5 mmb, 10 mmi, and 15 mmb
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
1050 nm - 1700 nm (C Coated)
1064 nm (V Coated)h
Glan-Taylor Calcite Polarizers 350 nmf - 2.3 µm (Uncoated) 5 mmb, 10 mmb, and 15 mmb
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
1050 nm - 1700 nm (C Coated)
Glan-Thompson Calcite Polarizers
(Unmounted or Mounted)
350 nmf - 2.3 µm (Uncoated) 5 mmi and 10 mmi
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
Double Glan-Taylor Calcite Polarizers 350 nmf - 2.3 µm (Uncoated) 9 mmb
(Clear Aperture, Square)
Calcite Beam Displacers 350 nmf - 2.3 µm (Uncoated) 10 mmb
(Clear Aperture, Square)
Wollaston Prism Polarizers 350 nmf - 2.3 µm (Uncoated) 10 mmi
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
Rutile Polarizers
Polarizer Type Wavelength Range Extinction Ratio Transmissiona Available Sizes
Rutile TiO2 Polarizers 2.2 µm - 4 µm 100,000:1 9.1 mm x 9.5 mm x 9.5 mmb and
10.7 mm x 15.9 mm x 15.9 mmb
  • Click on the graph icons in this column to view a transmission curve for the corresponding polarizer. Each curve represents one substrate sample or coating run and is not guaranteed.
  • Mounted in a protective box, unthreaded ring, or cylinder that indicates the polarization axis.
  • Available unmounted or in an SM05-threaded (0.535"-40) mount that indicates the polarization axis.
  • Available unmounted or in an SM1-threaded (1.035"-40) mount that indicates the polarization axis.
  • Available unmounted or mounted in cubes for cage system compatibility.
  • Calcite's transmittance of light near 350 nm is typically around 75% (see Transmission column).
  • The transmission curves for calcite are valid for linearly polarized light with a polarization axis aligned with the mark on the polarizer's housing.
  • The 1064 nm V coating corresponds to a -C26 suffix in the item number.
  • Available unmounted or mounted in a protective box or unthreaded cylinder that indicates the polarization axis.
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
GTH10M Support Documentation GTH10M:Mounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture
GTH10M-A Support Documentation GTH10M-A:Mounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, 350 - 700 nm AR Coating
GTH10M-B Support Documentation GTH10M-B:Mounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, 650 - 1050 nm AR Coating
Part NumberProduct Description
GTH5M Support Documentation GTH5M:Mounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture
GTH5M-A Support Documentation GTH5M-A:Mounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, 350 - 700 nm AR Coating
GTH5M-B Support Documentation GTH5M-B:Mounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, 650 - 1050 nm AR Coating

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Posted Comments:
Poster:jchristopheris
Posted Date:2014-02-16 13:35:36.653
I'm using the GTH10M as a clean up polarizer on a linearly polarized laser source (Argon Ion at 514.5nm). If I measure the power of the laser after passing through the GTH10M as a function of angle there are two maxima separated by ~180 degrees as expected. However, the maxima are not the same size, which surprised me. Is there a specification for how large this effect is and how I would account for it using Jone's matrices?
Poster:jlow
Posted Date:2014-02-25 05:27:51.0
Response from Jeremy at Thorlabs: This could possibly be caused by a slight misalignment or variation within our manufacturing tolerances. I will contact you to find out more about how much the difference is and how you have this setup to determine the cause.
Poster:tcohen
Posted Date:2012-11-22 12:19:00.0
Response from Tim at Thorlabs: A simple mounting solution would be to hold it inside an SM05L10 lens tube. This can be rotated in, for example, the PRM05 in a way analogous to the solution for the GTH10M detailed on the “Mounting” tab.
Poster:julienarmijo
Posted Date:2012-11-16 10:42:07.343
Hello. I would like to know what mounting solution is best recommended for the GTH5M. Shold we use a lens tube like you recommend to do for the GTH10M ?
Poster:bdada
Posted Date:2011-12-14 11:40:00.0
Response from Buki at Thorlabs: Thank you for using our Feedback tool. The extinction ratio is 100,000:1. This information is included in a data table in the "Overview" tab of the product page: http://www.thorlabs.de/NewGroupPage9.cfm?ObjectGroup_ID=5707&pn=GTH10M-B#5710 Please contact TechSupport@thorlabs.com if you have any questions.
Poster:luis-jose.salazar
Posted Date:2011-12-13 17:41:58.0
A important parameter to know is the extinction ratio. What is the value for the GTH10MB polarizer??? Thanks...
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Mounted Glan-Thompson Polarizers, Uncoated

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GTH5M Support Documentation
GTH5MMounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture
$430.00
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GTH10M Support Documentation
GTH10MMounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture
$555.00
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Mounted Glan-Thompson Polarizers, 350 - 700 nm AR Coating

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GTH5M-A Support Documentation
GTH5M-AMounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, 350 - 700 nm AR Coating
$466.00
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GTH10M-A Support Documentation
GTH10M-AMounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, 350 - 700 nm AR Coating
$590.00
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Mounted Glan-Thompson Polarizers, 650 - 1050 nm AR Coating

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GTH5M-B Support Documentation
GTH5M-BMounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, 650 - 1050 nm AR Coating
$466.00
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GTH10M-B Support Documentation
GTH10M-BMounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, 650 - 1050 nm AR Coating
$590.00
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