Output characteristics of a singly-resonant optical parametric oscillator: Dependence on the variation of the signal and idler output coupling

Abstract

Output characteristics of a double-pass singly-resonant optical parametric oscillator (SRO) resonant for both signal and idler waves are investigated as a function of reflectivity of the output coupler based on periodically poled Mg-doped stoichiometric LiTaO 3 (PPMgSLT) with a period of 32.7 µm. A configuration of plane-parallel two-mirror cavity is employed and the crystal surfaces are not coated. The SRO was pumped by a Nd:YAG laser which provides 85 ns-long-pulses with a repetition rate of 10 kHz. In our experiment, the wavelengths of signal and idler are 1.98 and 2.3 µm and the maximum available pump power is ∼ 21 W. Maximum average powers (conversion efficiency) of the total, the signal and the idler are 12.2 W (59%), 7 W (34%) and 5.6 W (27%), respectively.Keywords: Singly-resonant optical parametric oscillator; periodically poled Mg-doped stoichiometric LiTaO 3 ; high average power of infrared radiation.

Modeling and design of singly-resonant optical parametric oscillator with an intracavity idler absorber for enhanced conversion efficiency for the signal

“…The dynamics of OPOs is also a®ected by the re°ectivity of the output coupler. 21 For single crystal con¯guration, constant signal-wave approximation is valid when the re°ectivity of the output mirror is high. 22 We have analyzed the twin-crystal con¯guration, now with an idler absorber in between the two crystals.…”