Convex brewster-cut crystal for nonlinear frequency conversion
US6384973B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2001 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Apr 17, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3509
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A specially cut uncoated birefringent crystal having three Brewster-cut faces with adjacent coated Brewster-cut coupling prisms for optical frequency conversion. Two IR input frequencies are used to obtain a third visible light frequency by sum-frequency generation. The uncoated birefringent crystal permits high power input beams. The two Z-polarized IR beams enter the lower portion of the Brewster cut IR input end of the crystal and pass out the Brewster cut lower portion of the output end, generating a Y-polarized visible light beam. The visible wavelength beam is reflected at the Brewster cut Z-polarized surface at the output end and again reflected at the upper output end surface cut perpendicular to the Brewster cut. The visible beam travels back toward the IR input end near the top surface of the crystal and exits through an upper Brewster cut surface cut for Y-polarized light. Input and output prisms with appropriate optical coatings are used to facilitate the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.