Spatial filter with gain
US4803686A · kind A · utility
8Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Aug 3, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/10076
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus and a related method for generating a uniphase reference beam from a weak and aberrated input probe beam in an optical system. A portion of the input probe beam is split off and injected into the cavity of a laser, such as a semiconductor diode laser, where four-wave mixing takes place and an amplified input wave or its phase conjugate is output. Because the laser cavity is selected to provide single-mode operation, the laser provides not only amplification but an output that includes a uniphase wave, which may be interfered with the original aberrated input probe beam for purposes of obtaining wavefront information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.