Home Create an Account  |   Log In

View All »Matching Part Numbers


Your Shopping Cart is Empty
           

Mounted Glan-Thompson Polarizers


Related Items








Mounted Glan-Thompson Polarizers

Item #GTH5M(-A)(-B)GTH10M(-A)(-B)
Extinction Ratioa100,000:1
MaterialHigh-Optical-Grade Calcite
Wavefront
Distortion
≤λ/4 Over Clear Aperture
Surface Qualityb20-10 Scratch-Dig
Wavelength Range350 nm to 2.3 µm
Aperture5 mm x 5 mm10 mm x 10 mm
Dimensions
A21.6 mm36.6 mm
B12.7 mm25.4 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.
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, then is split at the intersection of the two crystals allowing S-polarized (e-ray) light to continue and P-polarized light (o-ray) to be absorbed by the housing. Due to the large field of view, these polarizers can be used for highly converging or diverging beams.

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 power densities up to 500 W/cm2 (CW).

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. 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 structure of calcite, a differential delay is created between two orthogonally polarized waves traveling in the crystal. As shown in the image to the right, this birefringent structure creates a polarization-dependent refraction that effectively steers the polarization planes in two angles. While the ordinary plane will travel straight through the crystal, the extraordinary plane will exit the crystal at an angle proportional to the wavelength as well as the length of the crystal.

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 Polarizer Field of View (FOV)

Thorlabs' Calcite Polarizers
Glan-Laser PolarizersGlan-Taylor PolarizersWollaston Polarizer
Mounted Glan-Thompson Polarizers
Unmounted Glan-Thompson Polarizers
Double Glan-Taylor PolarizerBeam 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 MountPRM1PRM05
Lens TubeSM1L20SM05L10a
Spanner WrenchSPW602SPW603
  • 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.
Loading Tag Cloud Loading...

Please Give Us Your Feedback
 
Email   Feedback On
(Optional)
Contact Me:
Your email address will NOT be displayed.
 
 
Please type the following key into the field to submit this form:
Click Here if you can not read the security code.
This code is to prevent automated spamming of our site
Thank you for your understanding.
  
 
Would this product be useful to you?       Little Use   1 2 3 4Very Useful

Enter Comments Below:
 
Characters remaining 8000    
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...
Click on any phrase below to search our site using our new Search Engine:
10mmx10mm   AR coated polarizer   calcite   calcite polarizer   calcite polarizer glan thomson glan thompson   glan   glan thompson   glan Thompson 10mm aperture   ir optics   ir polarizer   linear polarizers   nir linear polarizers   nir polarizer   polarization   polarizer   polarizor   uv polarizer   vis polarizer   visible optics  
Mounted Glan-Thompson Polarizers, Uncoated
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 Support Documentation
GTH5M Mounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture
$417.90
Today
GTH10M Support Documentation
GTH10M Mounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture
$538.65
Today
Mounted Glan-Thompson Polarizers, 350 - 700 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-A Support Documentation
GTH5M-A Mounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, 350 - 700 nm AR Coating
$452.03
Today
GTH10M-A Support Documentation
GTH10M-A Mounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, 350 - 700 nm AR Coating
$572.78
Today
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-B Mounted Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, 650 - 1050 nm AR Coating
$452.03
Today
GTH10M-B Support Documentation
GTH10M-B Mounted Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, 650 - 1050 nm AR Coating
$572.78
Today
Log In   |   My Account  |   Contact Us  |   Privacy Policy  |   Home  |   Site Index
Regional Websites: West Coast US | Europe | Asia | China | Japan
Copyright 1999-2014 Thorlabs, Inc.
Sales: 1-973-579-7227
Technical Support: 1-973-300-3000