Laser wavelength controlling apparatus
US5373515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1991 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Jun 21, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/225
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser wavelength controlling apparatus adapted for controlling the wavelength of a narrow-band oscillation laser beam at a high accuracy for long period of time even if environmental conditions such as the atmospheric temperature and pressure changes to some degree. This wavelength controlling apparatus includes a wavelength selective element (2) for narrowing the band width of the oscillating laser beam; a wavelength selection controller 9 and a wavelength selective element driver for changing the wavelength to be selected by the wavelength selective element (2); a reference light source (7) for generating a reference light for measuring the wavelength of the oscillating laser beam; a wavelength detector (8) for leading said oscillating laser beam and said reference light into a spectroscope and detecting the absolute wavelength of said oscillating laser beam on the basis of the detected value of the reference light; and a wavelength detecting driver (8a) for controlling the wavelength to be selected by said wavelength selective element in cooperation with said wavelength controller (9) so as to correspond the absolute wavelength detected by the wavelength detector with the pres…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.