Patent ID: 6785305
Filing Date: 2004-08-31
Classification: G01J,H01S

Abstract:
Tunable semiconductor laser light source in which a laser chip (LD) with a first resonator cavity end mirror, an optical system that is positioned such that it faces the emission facet of the laser chip (LD), and a second resonator cavity end mirror designed as a reflector (SP) are comprised as a resonator cavity arrangement, where said optical system possesses such longitudinal chromatic aberration, that a diffraction-limited or nearly diffraction-limited imaging of the emission facet of the laser chip (LD) together with the bundle of rays therein, onto the reflector (SP) and back into the emission facet of the laser chip (LD), is performed only for a spectral range, that is always narrow in comparison with the laser gain curve, and therefore guarantees that, dependent upon the position of the laser chip (LD), or upon the positioning of the reflector (SP), or generally upon the position of certain parts (O 22) of the resonator cavity arrangement in relation to the remaining parts (LD+O 21) of the resonator cavity arrangement, along its optical axis, the laser light source in each case runs in only a narrow wavelength range, which encompasses in the ideal case only one mode of the resonator cavity arrangement while at the same time, a high level of tolerance to adjustment deviation in the construction is ensured by the cat's eye assembly which is formed from a part (O 12, O 22) of the optical system, including the reflector (SP).