Patent ID: 6038239
Filing Date: 2000-03-14
Classification: H01S

Abstract:
A tunable laser light source, comprising a laser medium including a resonator terminal mirror, an imaging system (KO, O), an angular-dispersing element (GI), and a reflector (R) designed so as to be partially transmitting wherein,the reflector (R) situated at the site of the focus of the laser radiation defined by said imaging system (KO, O) and designed so as to be partially transmitting is arranged in such a fashion that together with at least a part (O) of the imaging system, it forms a largely direction-independent retroreflector according to the cat's eye principle, and at the same time, a space filter (SP) or an image thereof, slit-shaped in dispersion direction of the angular-dispersing element (GI), is situated at least approximately in the plane of reflector (R), the slit width extending in dispersion direction, so that only spectrally filtered radiation may pass the space filter (SP), thereby reaching the reflector (R), and the separation of back-coupled and decoupled, usable radiation is effected there, with high stability against maladjustment of the components perpendicularly to the dispersion direction of the angular-dispersing element (GI) and against inclination of the reflector (R).