Heterostructure lasers with combination active strip and passive waveguide strip
US4371966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1980 |
| Grant date | Feb 1, 1983 |
| Priority date | — |
| Expiry date | Nov 6, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/2275
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Heterostructure injection lasers include a combination optically coupled active and passive waveguide means forming an optically confining channel or strip between end facets. A passive or transparent waveguide means in the vicinity of the laser facets optically confines the radiation thereto in both dimensions transverse to the direction of propagation. The passive means is coupled to an active region of the laser which also optically confines the propagating radiation to the active region in both dimensions transverse to the direction of propagation. The active strip does not extend to the end facets of the laser. The combination active and passive means provides for high power, low divergence output beam, fundamental transverse mode control, lower operational current thresholds and the substantial elimination of laser astigmatism found in strip buried heterostructure lasers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.