Method of altering reflectivity of optical elements
US4893900A · kind A · utility
1Cited by
1References
19Claims
0Family size
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Key dates
| Filing date | Sep 20, 1988 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Sep 20, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/0315
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for restricting the mode of operation of long wavelength waveguide laser (FIG. 1) by introducing an approximate step function into the reflectivity of circular optical elements (19) used in such lasers. The preferred method is to grind off a portion of the optical coating (20) of the optical element (19) leaving a circular unground region (26) of high reflectivity having a diameter (D) of approximately 60% of the laser bore width (b) bounded by a ground region (28) of lower reflectivity. The method permits simple, inexpensive field modification of existing lasers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.