Semiconductor laser wavelength stabilizer
US4833681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1986 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Dec 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/1303
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Light relative to non-modulated output light emitted from a semiconductor laser is applied to an absorption cell. Frequency modulating signals are converted into amplitude modulation signals of the output light through a modulating means by utilizing absorptive properties of the absorption cell. Transmissive light outputs of the absorption cell are synchronously rectified by a lock in amplifier, and an electric current supplied to the semiconductor laser is controlled so that the output signals of the lock in amplifier are arranged to be a predetermined value. The wavelength of the output light is locked to the absorption line of the standard substance in the absorption cell. Advantageously, the invention stabilizes the instantaneous value of the oscillation frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.