Infrared germanium film polarizer
Abstract
Abstract An infrared germanium film polarizer based on interference in thin germanium films of different thicknesses inclined to an optic axis at the Brewster angle. The germanium films are evaporated onto a low index of refraction transparent substrate, namely sodium chloride. Four plates of sodium chloride are in the form of an X to make the path of each ray symmetrical, so the transmitted beam will be undeviated. A well collimated beam of infrared radiation passing through the polarizer will experience interference effects because of the germanium films on the sodium chloride plates. The p polarized light transmitted is diminished only by the reflection losses at the Ge-NaCl interfaces. The s polarized light undergoes interference in the thin Ge films.
Inventors
- 👤 E Ashley
- 👤 D Decker
- 👤 J Bennett
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |