Single frequency, monolithic Nd:YVO4/YVO4/KTP diode pumped solid state laser optimization by parasitic oscillations elimination

In this paper the single frequency, monolithic Nd:YVO4/YVO4/KTP green (532nm) laser is presented. The single mode operation was obtained using birefringent filter formed by a YVO4 beam displacer and a KTP crystal. The laser performances were improved by elimination of parasitic oscillations propagating along the beam displacer extraordinary ray. The single frequency operation temperature range was extended to 11.5°C and the output power increased to 160mW at 532nm compared to 85mW before optimization. The optical to optical efficiency (808–532nm) was 16.8%. The linewidth and the long term passive frequency stability under the free running conditions were Δν