A periodically poled lithium niobate optical parametric oscillator pumped by a Tm:YAG laser at 2.0124-μm wavelength has been demonstrated. A pump pulse energy of 5.1 mJ generated 0.65 mJ of signal and idler pulse energy at a 50-Hz repetition frequency with a 27.8-μm domain-period-length grating. The lithium niobate crystal at a temperature of 180 °C yielded 3.61- and 4.55-μm signal and idler wavelengths, respectively. Wavelength tuning over a wide range was achieved with domain-period lengths from 25.5 to 28.2 μm and crystal temperature tuning from 50 to 180 °C. Signal wavelengths of 3.26–3.76 μm and idler wavelengths of 4.33–5.34 μm were generated.
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