Zinc Selenide (ZnSe) Windows: A parallel plane plate, usually used as a protective window for electronic sensors or detectors of the external environment.
| Dia. Tolerance | '+0.0/-0.1mm |
| Thickness Tolerance | ±0.1mm |
| Transmited Wavefront | 1λ@633nm |
| Parallelism | 1' |
| Surface Quality | 20/10-40/20 |
| Bevel | 0.2X45° |
| Coating | None |
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