Patent ID: 8498316
Filing Date: 2013-07-30
Classification: H01S

Abstract:
1. A laser device for intra-cavity frequency conversion, in particular, for a second harmonic generation, the device comprising: a laser cavity, formed by a first laser cavity end reflector and a second laser cavity end reflector wherein said laser cavity end reflectors are highly reflective for a radiation about a laser fundamental frequency and as such provide for a predetermined level of circulating inside the cavity fundamental frequency power to effect a corresponding efficiency of non-linear frequency conversion; an active medium provided within the said laser cavity; at least one non-linear crystal, in particular, for the second harmonic generation provided within the same laser cavity; tuning means adapted for tuning at least one of laser cavity end reflectors; characterized in that at least one of the laser cavity end reflectors comprises an interferometric layout providing spectrally selective reflection for the radiation about the laser fundamental frequency with a value of reflectivity nearly to 100% within a spectral range close to a free spectrum range of the laser cavity and with a sufficiently lower reflectivity outside the above spectral range such that the laser cavity restricts a spectrum of the laser radiation to a single longitudinal mode.