Patent ID: 6377592
Filing Date: 2002-04-23
Classification: H01S

Abstract:
A method for wavelength stabilization of a laser, comprising the steps of:feeding a first power portion of a total optical power emitted by said laser to an optical interference filter which is wavelength-selective and which is set at a predetermined wavelength, said interference filter filters out a filtered-out power portion containing essentially only said predetermined wavelength from said first power portion fed to said optical filter, deriving an additional power portion from said total optical power emitted by said laser such that a ratio between said filtered-out power portion and said additional power portion is independent of said total optical power, measuring said filtered-out power and said additional power portion to provide a measured filtered-out power and a measured additional power portion respectively measured, forming said ratio between said measured filtered-out power portion and said measured additional power portion, comparing said ratio as an actual value to an adjustable desired value of said ratio, and given deviation of the actual value from said desired value, adjusting an operating parameter of said laser on which on the predetermined wavelength depends so that the actual value essentially matches said desired value to stabilize laser at said predetermined wavelength.