概述
Birefringent filters are designed based on the interference principle of polarized light from birefringent crystals. Generally, quartz crystals are used, and the optical axis of the crystal is parallel to the surface of the crystal.
General parameters
| Material | Quartz crystals | Dimensional tolerances(mm) | +0/-0.2 |
| Thickness tolerance(mm) | ±0.005 | Surface | 20/10 |
| Through-light aperture | >90% | Through wavefront distortion | <λ/8@632.8nm |
| Parallelism | <5〞 | Thickness(mm) | 0.5、1、2、4、8 |
| Coating | None |
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