Nd:YAG Laser Pumped Optical Parametric Oscillator (OPO):
Nd:YAG Laser (Spectron Laser Systems Co.- Model SL450) is 10 Hz repetition rate with pulse energy of 120 mJ at 355 nm. The tuning range of OPO (GWU-Lasertechnik GmbH) is from 410 nm to 2500 nm and pulse duration is approximately 2 ns. The scanning is computer controlled.