The Parametric IR Lasers with High Radiation Efficiency Over the Entirerange of Frequency Tuning

Abstract

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

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“…The choice of a three-mirror scheme was made based on the need to compensate for the inhomogeneity of the cross section of the OPO output radiation beam, as well as to reduce the effect of optical inhomogeneity of the pump radiation on the nonlinear crystal, which can be achieved by parametric generation of light in the traveling wave mode with image rotation after each bypass. To ensure the maximum efficiency of conversion of pump radiation from a pulsed YAG:Nd3+ laser with a pump wavelength λ= 1.064 μm into parametric radiation in the near and mid-IR ranges, two types of nonlinear crystals were used: lithium niobate (LiNbO3) [2] for tuning in the range of 1.41 -4.24 µm and silver thiagallate crystal (AGS) for tuning in the range of 3.32-8.51 µm. The optical scheme of the OPO resonator is shown in Fig.…”