The Foster polarizer is made of two calcite prisms cemented together. The output beams separate at an angle of 45°.
Although both beams are available for use, only the undisplaced beam is of the exceptionally high polarization purity generally associated with crystal polarizers. The 45° reflected beam has a much lower degree of polarization.
As with all of our optics, we will gladly provide these items custom designed to your particular requirements. As an alternative, we offer a selection of standard items as specified below.
Standard products:
| Order No. | L/A | Extinction Ratio | Angular Field (°) | CA phi a (mm) | O.D. phi d (mm) | L ± 0.1 (mm) |
|---|---|---|---|---|---|---|
| 50.230.00110 | 2.4 | <5x10-5 | >15 | 6.0 | 50.8 | 33.0 |
| 50.230.00111 | 2.4 | <5x10-5 | >15 | 8.0 | 50.8 | 33.0 |
| 50.230.00112 | 2.4 | <5x10-5 | >15 | 10.0 | 50.8 | 33.0 |
| 50.230.00113 | 2.4 | <5x10-5 | >15 | 12.7 | 50.8 | 33.0 |
| 50.230.00114 | 2.4 | <5x10-5 | >15 | 15.0 | 50.8 | 38.0 |
We take quality control very seriously: we rely on accurate, widely recognized measurement systems for testing our optics. The following table indicates the accuracy of measurement for the most relevant parameters.
Surface figure: λ/20
Angle: 0,5 arcsec
Radius: 0,01%
Focal length: 0,03%-0,3%
Centration: +/-0,2µm or +/-2 arcsec
Wavelength: +/-0,3nm (190-1100nm)
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