Air-Spaced Polarizers

Air-Spaced Polarizers

These products exhibit higher transmission and better damage threshold than calcite polarizers, and do not produce the unwanted beam displacement associated with Brewster-type polarizers.

Type 1
Type 2 Type 3​

Polarization transmittance, TP

> 98.0%
> 97.5%
> 97.0%​
Contrast ratio, TP / TS
> 500:1
> 500:1
​> 500:1
Damage threshold @ 1064 nm, 20 nspulse
500 MW / cm2
500 MW / cm2
​300 MW / cm2
Transmitted wavefront distortion @ 633 nm
< 1 / 8ë​
< 1 / 8ë
< 1 / 4ë​
Transmitted beam deviation
< 2 arc minutes 
< 3 arc minutes
< 3 arc minutes​
Reflected beam deviation < 4 arc minutes​ < 4 arc minutes
< 4 arc minutes​
Acceptance angle
+0.5° to -0.5°​ +0.5° to -0.5°
+0.5° to -0.5°​
Surface quality, scratch-dig
​20 - 10 40 - 15
60 - 20​
Surface reflectivity
< 0.15%
​< 0.25% < 0.25%​
​Operating temperature range -40 °C to +70 °C​ -40 °C to +70 °C
-40 °C to +70 °C​
Standard wavelength
1064 nm
​1064 nm 1064 nm​