Abstract
This paper reports a continuous-wave (CW) mid-infrared intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate (PPLN) pumped by a diode-end-pumped CW Nd:YVO4 laser. Considering the thermal lens effects, it adopted an optical ballast lens and the near-concentric cavity for better operation. At the PPLN's grating period of 28.5μm and the temperature of 140°C, the maximum idler output power of 155mW at 3.86μm has been achieved when the 808nm pump power is 8.5W, leading to an optical-to-optical conversion efficiency of 1.82%.
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