INTRACAVITY FREQUENCY-DOUBLED DIODE-PUMPED ND-LASC3(BO3)(4) LASERS

An intracavity frequency-doubled 10%Nd: LaSc3(BO3)(4) (Nd:LSB) laser w as investigated in different resonator configurations and in different operation modes under continuous wave (cw) and quasi-cw laser-diode p umping. With a Cr4+:YAG passive modulator and a KTP crystal the second -harmonic output power at 531 nm amounted to 190 mW in Q-switched TEM( 00) mode at 750 mW of pump power. In a sandwich resonator, when all th e optical elements were in direct contact with each other? 0.8 W of gr een output power was obtained in cw mode under 2.7 W of pump power wit h a slope efficiency of 44%. In the same setup under fiber-coupled dio de-laser array pumping (5.6 W of incident power), 1.2 W of green outpu t power was achieved in cw mode and 1.4 W in quasi-cw mode.