Greater than 2 W of average power was generated in the infrared region
by a AgGaS2 optical parametric oscillator(OPO). A Q-switched mode-loc
ked laser was used to pump the OPO synchronously. Tunability from 1.4
to 1.9 mu m and a maximum output power of 750 mW at 1.44 mu m were ach
ieved with a standing-wave cavity. Redesigning the cavity into a ring
configuration allowed the depleted pump, signal, and idler beams to be
extracted efficiently through separate mirrors. This design generated
signal and idler beams of high spatial quality at respective power le
vels of 1.5 and 620 mW at a pulse repetition rate of 2 kHz.