Optical parametrical oscillator within 2.4-4.3 μm pumped by compact nanosecond Nd:YAG laser.
Optical parametrical oscillator, based on periodical polarized structure MgO:PPLN, is developed. Compact nanosecond Nd:YAG laser at 1.053 μm has been used as a pumping source. Pulse duration is 5-7 nanoseconds at maximum pulse energy of 300 μJ (1000-5000 Hz). The OPO threshold is 22 μJ at 3 μm and 48 μJ at 4.3 m. An optical-to-optical conversion efficiency varies within of 4-12.5% from incident pump power to the idler output.