Computational and experimental studies of the lasing characteristics of IR optical parametric oscillator (OPO) on the nonlinear crystal LiNbO3 were performed. Implemented outside the cavity ring scheme OPO with replaceable output mirrors allows the conversion of the pump frequency in parametric generation to 30 % over the tuning range from 1.41 to 4.24 microns

A continuously or/and discontinuously tunable LiNbO 3 Optical Parametric Oscillator (OPO) with the spectral range of 1.42 -4.24 um and shifting of 0…12 nm is created and investigated. The OPO resonator ring circuit provides for the radiation energy output value of up to 50 mJ. Radiation bandwidth narrowing of up to 0.7 cm -1 by introducing of the Fabry-Perot etalon into the OPO resonator has been obtained.