Patent ID: 6400739
Filing Date: 2002-06-04
Classification: H01S,H04B

Abstract:
A wavelength-stabilized laser configuration, comprising:a semiconductor laser outputting a laser beam having a laser power, a laser beam path, and a laser light; a regulating device, including: a first optical detector receiving a first partial beam derived from said laser beam and outputting a first optical detector output signal; an optical filter; a second optical detector disposed downstream of said optical filter and receiving a second partial beam derived from said laser beam and filtered by said optical filter, said second optical detector outputting a second optical detector output signal; a signal processing device receiving the first optical detector output signal and the second optical detector output signal and determining from the first optical detector output signal and the second optical detector output signal an actual value signal being representative of an instantaneous laser wavelength &lgr; being independent of the laser power; a comparison device connected to said signal processing device for comparing the actual value signal with a predetermined desired value signal specifying a desired wavelength &lgr;0; and a drive device connected to said comparison device, said drive device generating a control signal setting an operating parameter of said semiconductor laser, said operating parameter influencing a wavelength to be stabilized such that the actual value signal substantially corresponds to the predetermined desired value signal; and an optical isolator disposed in said laser beam path and having a first polarizer, a device for rotating a plane of polarization of said laser light and connected downstream of said first polarizer, and a second polarizer connected downstream of said device for rotating the plane of polarization of the laser light, at least one of said first polarizer and said second polarizer being used as a beam splitter for coupling out one of said first partial beam and said second partial beam.