Abstract
We report on an efficient diode pumped compact source of pulsed tunable infrared radiation based on a high repetition rate single frequency passively Q-switched Nd:YAG laser and an optical parametric oscillator (OPO) of quasi-phase matched LiNbO 3. When pumped by 5.4 W of 810 nm cw diode laser radiation the Nd:YAG laser (which is passively Q-switched by a Cr 4+:GSGG saturable absorber) oscillates on a single-longitudinal mode and emits in a diffraction limited beam light pulses with duration of 2 ns, pulse energy of 100 μJ, repetition rate of 1.1 kHz and average power of 110 mW. This radiation excites an OPO of quasi-phase matched LiNbO 3. The OPO generates signal and idler radiation which is tunable in the range of 1.46–1.61 μm and 3.13–3.92 μm, respectively. Tuning is achieved by using 8 different poling periods ( Λ=28.5–29.9 μm) and by changing the crystal's temperature in the range of 80–160°C. The measured signal pulse energy is E S =22 μJ, the average signal output power P S =24 mW, the measured idler power P I =2.5 mW and the pump depletion 33%.
Published Version
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