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Glan Type Polarizers

Material

a-BBO, YVO4, Calcite

Wavelength range

200 – 4000 nm

Clear aperture

Ø8 – 20 mm

Length

15 – 50 mm

Extinction ratio

<5×10-6*

Surface quality, S-D

20-10

Transmitted wavefront distortion, P-V

<λ/2-λ/4 @ 632.8 nm

Coatings

Single layer MgF2

LIDT

>100-500 MW/cm²

*depending on material

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Glan-type polarizers are mounted polarizing prisms used for applications that require broad spectral ranges, high extinction ratios and/or high polarization purities.

A typical use for such polarizers is for “cleaning” the polarization of a light source, or for the attenuation of a polarized light source. Glan-type polarizers have a few advantages over thin film polarizers (TFPs): firstly, the extinction ratio of Glan-type polarizers is higher than that of TFPs by 2 to 4 orders of magnitude, allowing them to have better polarization purity; secondly, they have a broadband spectral operation range, whereas TFPs are designed for narrow laser-line operation. Standard Glan-type polarizers are mounted into barrel type mounts, which are convenient for most applications.

Altechna offers three types of Glan-type polarizers, you can choose according to your application:

  • Glan-Taylor
  • Glan-laser
  • Glan-Thompson

A Glan-Taylor polarizer is a medium-power polarizer designed to transmit only extraordinary polarization beam whereas an ordinary polarization beam is deflected to the housing. The side faces are painted black to absorb rejected beams. The polarizer is designed in a way that makes a shorter length available, meaning it is the best choice for medium-power ultrashort laser-pulse applications that require the lowest possible amount of pulse stretching.

Glan-Thompson polarizers are low-power polarizers that are ideal for visible or NIR applications that require the highest-possible transmission values. Because of the cement used, they have higher transmission than Glan-Taylor polarizers but a limited useful UV spectral range and lower LIDT values. A transmitted beam of extraordinary polarization is used. The side faces are painted black to absorb rejected beams.

 

Glan-laser Polarizers are like Glan-Taylor ones, but are designed for higher-power applications. The polarizer has two escape windows to allow the rejected beams to escape. The entrance and exit faces are polished using a deep grinding and polishing technique to minimize scattering from the surface.

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