Additional information
| Dimension | 1.0" dia x 3.0mm t, 1.5" dia x 4.0mm t, 2.0" dia x 5.0mm t, 2.0" dia x 0.375" t, 3.0" dia x 0.25" t |
|---|---|
| Material | Silicon |
| Retardation | 0 degree, 90 degree |
| Wavelength | 10.6 µm |
Phase Retarding Mirror – Si Substrates
- Changes state of polarization or maintains polarization ellipticity
- Improves beam focus
Phase retarding mirrors have an all-dielectric coating on a Silicon substrate. The coating has a distinct control over the relative phase between the incident and outgoing waves. They are intended for use with Carbon Dioxide lasers operating at 10.6 um. Retardation of 45° changes a linearly polarized input to a circularly polarized output. This will provide improved beam focusing capability. If a given state of polarization must be maintained throughout an optical chain, then 0° retardation mirrors should be selected. These will not change the state of polarization of the incoming beam on reflection. To rotate the plane of linear polarization by 90° choose the 90° phase retardation mirrors. These mirrors are intended for use at 45° angle of incidence.
| Material: | Silicon |
| Design Wavelength: | 10.6 µm @ 45deg AOI |
| Surface Flatness: | < λ / 20 @ 10.6 µm |
| Surface Quality: | Side 1: < 40 / 20 Side 2: Fine Ground |
| Wedge: | < 3 arc min |
| Diameter Tolerance: | < + 0 / – 0.008″ |
| Thickness Tolerance: | <± 0.010″ |
| Clear Aperture: | > 85% of diameter |
| Bevel: | 0.3 mm (typical) x 45° |
| Reflectance: | R> 98.5% |
| Retardation: | 0: 0° ± 3° λ / 4: 90° ± 2° |
| Absorption: | < 0.4% |
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Phase Retarding Mirror – Si Substrates
