Mid-IR waveplates
Description
Zero Order CdGa2S4 waveplates for mid-IR applications (2,8-9,0 microns)
Zero order half waveplates and quarter waveplates from cadmium thiogallate (CdGa2S4) with clear aperture from 10mm up to 18mm for the range 2,8 - 9,0microns are now available from Altechna.
Dielectric AR coatings for the mid-IR range are also available in order to enhance the performance of the waveplates. Characteristic plates thickness is 0,5 - 0,9 mm. Generally, the waveplates are mounted into the metal mount for easier handling and adjustment.
Standard Specifications
| Material |
Cadmium thiogallate (CdGa2S4) |
| Birefringence (no-ne) |
~ 0,005 at IR |
| Transparency range |
0,47 - 9,5 microns |
| Surface Flatness |
< Lambda/8 |
| Wedge angle between faces |
1,5-2,0 arcmin |
| Clear aperture |
10mm |
| Characteristic thickness |
0,5 - 0,9 mm |
| Diameter of the metal holder |
25,4 mm |
| Damage threshold |
~ 0,6 - 0,8 J/cm2 at 20ns pulses |
| Thermal conductivity |
~ 3W/(mxK) |
| Refractive index |
no ~ 2,3 |
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