High-power second-harmonic generation of the output from an AlGaAs diode oscillator-amplifier system in critically phase-matched LBO and BBO

Summary form only given. Frequency-doubled near-infrared diode lasers are compact sources of visible laser light. For efficient frequency doubling the power of the laser radiation is usually enhanced by an external resonator. The doubling crystal is then placed at the location of a resonator internal focus. This doubling scheme requires diode laser radiation with near-diffraction-limited divergence and the laser frequency must be locked to a resonance of the enhancement cavity. The aim of our investigations was the generation of short-wave blue radiation by frequency doubling the output of a 804 nm AlGaAs oscillator-amplifier laser diode system in critically type-I phase-matched LiB/sub 3/O/sub 5/ or BaB/sub 2/O/sub 4/ crystals.