BLUE-LIGHT GENERATION BY RESONATOR-ENHANCED FREQUENCY-DOUBLING OF AN EXTENDED-CAVITY DIODE-LASER

Frequency doubling of diode laser radiation was achieved by operating an AR-coated diode laser in an extended laser cavity which contained a monolithic potassium niobate frequency doubling resonator as an intra cavity element. Extended cavity operation ensured that the diode laser would oscillate only at frequencies that were resonant with the intra cavity resonator. A diffraction grating was used to ensure single mode oscillation at the wavelength needed for noncritically phase-matched second harmonic generation. At 100 mA of injection current to the GaAL As diode laser, 14 mW of 429 nm light were produced.