Single mode laser emission
US4573156A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1983 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Sep 16, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is an optical device producing single mode laser emission. The device includes a semiconductor laser which would normally emit a number of closely spaced longitudinal modes and a filter which receives light from the laser active layer and reflects light back to the active layer. The filter includes at least one thin, optically absorbing layer, a dielectric layer, and a reflecting layer. The thickness and refractive indices of the layers are such that the filter reflectivity has a number of narrow maxima, but only one which lies within the gain bandwidth of the laser. The width of the peak and the background amplitude between peaks is such that only a single longitudinal mode of the laser is allowed to oscillate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.