Thin Film Polarizers

Polarization optics is important for both intra and extra cavity use. By having high contrast thin film polarizers in their design, laser engineers can save weight and volume within their devices without influencing the output. Compared with polarizing prism, polarizer has larger incident angle and can be made with larger apertures. Compared with polarizers made from birefringent crystals, the advantage of thin film polarizers is that they can be made in very large sizes, therefore can work in a laser device with high power or energy.


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Product Details

Thin Film Polarizers are made from composed materials which include a polarizing film, an inner protective film, a pressure-sensitive adhesive layer, and an outer protective film. Polarizer is used to change un-polarized beam into linear polarized beam. When the light passes through the polarizer, one of the orthogonal polarization components is strongly absorbed by the polarizer and the other component is weakly absorbed, thus natural light is converted into linearly polarized light.Thin Film Polarizers


WISOPTIC Specifications - Thin Film Polarizers


Material

BK7, UVFS

Diameter Tolerance

+0.0/-0.15 mm

Thickness Tolerance

± 0.1 mm

Clear Aperture

> 90% of central area

Surface Quality [S/D]

< 20/10 [S/D]

Transmitted Wavefront Distortion

λ/10 @ 632.8 nm

Parallelism

≤ 30”

Extinction Ratio (Tp/Ts)

> 200:1

  Coating

  High LDT coating upon request

  Laser Damage Threshold

10 J/cm² @ 1064 nm, 10 ns, 10 Hz

 

Comparison of Different Materials of Polarizers



YVO4

Calcite

α-BBO

Quartz

Transparency Band

500-4000 nm

350-2300 nm

220-3000 nm

200-2300 nm

Crystal Type (uniaxial)

Positive
no=na=nb, ne=nc

Negative
no=na=nb, ne=nc

Negative
no=na=nb, ne=nc

Positive
no=na=nb, ne=nc

Mohs Hardness

5

3

4.5

7

Thermal Expansion Coefficient

aa=4.43x10-6/K
ac=11.37x10-6/K

aa=24.39x10-6/K
ac=5.68x10-6/K

aa=4x10-6/K
ac=36x10-6/K

aa=6.2x10-6/K
ac=10.7x10-6/K

 

Thin Film Polarizers Optical Path Chart


Thin Film Polarizers


Thin Film Polarizers



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