Patent ID: 8416831

Claim:
Laser light source for producing narrow-band laser radiation having great coherence, with a laser diode ( 1 ) that forms an internal resonator ( 4 ), and with an external resonator ( 7 ) coupled with the internal resonator ( 4 ), wherein the laser diode ( 1 ) runs in an operating mode in which multi-mode laser radiation is produced, which radiation comprises multiple spectrally adjacent resonance modes ( 9 ) of the external resonator ( 7 ), whereby these resonance modes are selected by means of adaptation of the spectral characteristics of the external ( 7 ) and the internal resonator ( 4 ); the laser diode ( 1 ) runs in an operating mode having essentially a resonance mode ( 10 ) of the internal resonator ( 4 ); the internal ( 4 ) and the external ( 7 ) resonator are coordinated with one another in such a manner that the resonance mode ( 10 ) of the internal resonator ( 4 ) is filled out by at least two resonance modes ( 9 ) of the external resonator ( 7 ); and the resonance modes ( 9 ) of the external resonator ( 7 ) are spectrally widened and have a spectral width of at least 0.5 GHz.