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Infrared Polarizers

Infrared Polarizers
Infrared Polarizers
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Product Code : 261
Product Description

Polarizers are useful for enhancing sensitivity in grazing angle measurements using specular reflectance accessories and for molecular orientation studies. Polarizers attenuate radiation from polarized lasers, polarize radiation from unpolarized lasers and can be used in pairs to both polarize and attenuate. ICL wire grid polarizers are available for wavelength ranges from 3µm to 15µm.
These wire grid polarizers are created by etching sub-micron spaced grooves (2400 grooves per mm) using holographic methods. Each polarizer is mounted in a protective 5mm thick anodized aluminum ring that protects both faces of the polarizer. The outside diameter (OD) of the 25mm polarizer is 25mm with a clear aperture of 18mm. The OD of the 50mm polarizer is 50mm with a clear aperture of 34mm.

NATIONAL's 25mm wire grid IR Polarizers are available with 360° rotation stage holders that are mounted on 2" x 3" backplates. These rotating mounts render the polarizer suitable for use in any FTIR or IR spectrophotometer simply by sliding the mount containing the polarizer into the instrument's standard 2" x 3" slide mount fixture. The polarizer, which is itself permanently mounted in a black anodized aluminum ring, is easily inserted into and removed from the rotating holder without touching the face of the polarizer. When ordered with a mount, polarizers can be installed in the mount prior to shipping on customer's request.

Material
CaF2
BaF2
ZnSe
KRS-5
Wavelength
3µm
8µm
3µm
10µm
3µm
10µm
3µm
15µm
Typical Extinction Ratio
100:1
250:1
100:1
300:1
100:1
300:1
100:1
200:1
Wire Grid Spacing
2400 Grooves/mm
2400 Grooves/mm
2400 Grooves/mm
2400 Grooves/mm
Parallelism
<= 3 arcmin
<= 3 arcmin
<= 3 arcmin
<= 3 arcmin
Substrate Thickness
2mm nominal
2mm nominal
2mm nominal
2mm nominal
Ring Thickness
5.0mm +/- 0.1mm
5.0mm +/- 0.1mm
5.0mm +/- 0.1mm
5.0mm +/- 0.1mm
Dimensonal Tolerance
+/- 0.5mm
+/- 0.5mm
+/- 0.5mm
+/- 0.5mm
Damage Threshold
10W/cm² CW
10KW/cm² Pulsed
10W/cm² CW
10KW/cm² Pulsed
10W/cm² CW
10KW/cm² Pulsed
10W/cm² CW
10KW/cm² Pulsed

Part No.
Description
4329-5165
25mm KRS-5
Wire Grid Polarizer
4329-8429
50mm KRS-5
Wire Grid Polarizer
4329-5169
25mm CaF2
Wire Grid Polarizer
4329-8432
50mm CaF2
Wire Grid Polarizer
4329-5170
25mm BaF2
Wire Grid Polarizer
4329-8430
50mm BaF2
Wire Grid Polarizer
4329-5171
25mm ZnSe
Wire Grid Polarizer
4329-8431
50mm ZnSe
Wire Grid Polarizer
4329-5172
360° Rotation stage with 2" x 3" backplate for mounting 25mm IR polarizer in any IR or FTIR spectrophotometer

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