System and method for low noise optical retroreflection with gain
US4934779A · kind A · utility
6Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Apr 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0338
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A low noise system and method for both amplifying and retroreflecting an information-bearing probe beam employs a two-wave mixer in conjunction with a pseudoconjugating element. The probe beam is amplified by two-wave mixing in a photorefractive medium, while the pseudoconjugator is arranged to retroreflect the amplified probe beam back through the photorefractive medium such that optical distortions imposed upon the beam during the amplifying pass are compensated, yielding an output with a high signal-to-noise ratio. Various types of pseudoconjugating elements may be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.