Apparatus to transform a single frequency, linearly polarized laser beam into a high efficiency beam with two, orthogonally polarized frequencies
US4687958A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1985 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Mar 12, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electro-optical apparatus transforms a single stabilized frequency, linearly polarized laser input beam (18) from a light source (10) into an output beam (28) having two collinear orthogonally polarized output beam components (24,26) differing in frequency from each other by the frequency of a frequency stabilized electrical signal (32) provided from an electronic oscillator (30). The input of the oscillator (30) is provided to a power amplifier (34) which is used to drive a piezoelectric transducer (40) affixed to an acousto-optical Bragg cell (44) through which the input beam (18) passes and is transformed into the output beam (28) composed of the two beam components (24,26). The electrical output (36) of the power amplifier (34) is adjusted so that each of the output beam components (24,26) have approximately the same intensity which is each approximately half of the input beam (18) to provide a nominal efficiency of about 100%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.