NEW CAVITY CONFIGURATIONS OF ND-MGO-LINBO3 SELF-FREQUENCY-DOUBLED LASERS

Two types of self-frequency-doubled Nd:MgO:LiNbO3, laser are demonstra ted. Their oscillation polarization directions were controlled for sec ond harmonic generation with new cavity configurations which are small er than the conventional cavity configuration containing a Brewster wi ndow. The first laser uses an etalon effect to select the oscillation polarization direction. It emits 0.27 mW of green light (0.546 mu m) f rom a single side of the cavity in quasi CW mode when the crystal abso rbs 33 mW of pump light (0.813 mu m) from a laser diode. The second la ser has a monolithic cavity and the polarization selection is achieved with angle-walk-off caused by birefringence. It emits about 0.2 mW of green light in quasi CW mode when about 100 mW of pump light is incid ent. In addition to these experiments, the effectiveness of these pola rization selection methods is numerically confirmed.