Techniques of radiation phase matching within optical crystals
US5644422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1996 |
| Grant date | Jul 1, 1997 |
| Priority date | — |
| Expiry date | Jan 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3546
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A non-linear crystal is used as an optical radiation frequency converter. Its efficiency is optimized though control of one or more operating conditions that include the temperature of the crystal, its angular relationship with incident radiation and an electric field bias in which the crystal operates. The relative phase between radiation incident upon the crystal and that generated by it is adjusted by a servo loop which controls one or more of these operating conditions. The servo loop responds to a cyclic variation in the output radiation which occurs when the crystal is not operating at an optimal efficiency. A quasi-phase matched (QPM) crystal is preferred. Several specific crystal structures are described. The technique has an application in a frequency doubler, among others.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.