Patent ID: 6418251
Filing Date: 2002-07-09
Classification: G02B,H01S

Abstract:
A method for selecting and stabilizing frequency of light emitted by a semiconductor laser diode, comprising:providing a system of optical components arranged in the direction of light propagation, said system comprising a semiconductor laser diode that radiates a light of a given wavelength band, an input optical fiber, a laser cavity formed by a part of said optical components of said system between a first reflecting mirror essentially with 100% reflection of light and a second reflecting mirror that passes only a selected portion of said light of a predetermined frequency and contains a frequency selection means for selecting a light of a predetermined frequency in said given wavelength band, a first coupling means for coupling said semiconductor laser diode to said input optical fiber, an output optical fiber, a second optical coupling for coupling said input optical fiber with said output optical fiber; generating said light of said given wavelength band by said semiconductor laser diode; passing said light of said given wavelength band through said frequency selection means; selecting light of a predetermined frequency in said given wavelength band and narrowing said given wavelength band; propagating the light of narrowed wavelength band further to said second mirror; passing only the light of said narrowed wavelength band through said second mirror to said output optical fiber; reflecting the remaining portion of said light of a predetermined frequency back to said first mirror via said frequency selection means to said first mirror; reflecting said remaining portion of said light, that was received from said second reflecting mirror after passing through said frequency selection means, from said first reflecting mirror; and continuing generating said light of said given wavelength band by said semiconductor laser diode, while repeating, for the light reflected from said second mirror, at least once all said steps starting from said step of passing said light through said frequency selection means.