Rugate filter on grating coupled surface emitting laser array
US5109386A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1990 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Sep 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/187
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A glass film is deposited over the second order grating of a grating coupled surface emitting laser. The glass film has a continuously varying refractive index with thickness, usually in the form of or similar to a sine wave. The rugate filter is assembled to overlie the second order grating of the laser so that a peak wavelength .lambda..sub.p is reflected back into the second order grating which couples the light into the laser. Be reflecting light at the peak wavelength back into the laser, the laser is caused to emit at the desired wavelength. Since the rugate filter selectively reflects light within a narrow band of the desired wavelength, the laser emits light within the same narrow band. The use of a surface emitting laser facilitates summing of the output light of several adjacent lasers within a monolithic array to provide high power output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.