Device for compensating for thermal instabilities of laser diodes
US5043991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1989 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Dec 28, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/1231
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention proposes a dielectric waveguide formed on a substrate of ultra-low thermal expansion glass which is assembled with a commercially available diode laser to create a temperature stabilized laser. The waveguide comprises multiple dielectric films which have equal and opposite temperature induced changes in refractive index with respect to each other into which is formed a Bragg grating, the grooves of which are sufficiently shallow to allow penetration of light into the waveguide of 1 mm to 1 cm. This provides a signal which is both narrowband and frequency stable so that the optical signal can be guaranteed to remain in a given narrow frequency band. The dielectric layers are deposited using ion assisted deposition (IAD) to provide uniform, high density films with reduced index-temperature coefficients and increased density, resulting in a waveguide with near-zero temperature variations in refractive index. After fabrication, the waveguide is assembled to the diode laser, creating a temperature stabilized laser which operates within 1 .ANG. of the target wavelength over the temperature range from 20.degree. C. to 70.degree. C. In one embodiment a temperature sta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.