10 April 1995 Frequency upconversion experiments in an optical parametric oscillator
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In separate experiments, we performed phase-matched sum-frequency generation (SFG) and phase-matched second-harmonic generation (SHG) of the optical waves inside an optical parametric oscillator (OPO). The OPO is synchronously pumped and is based on AgGaS2. The pump wavelength is at 1.064 micrometers , and the signal and the idler wavelengths are tunable around 1.319 micrometers and 5.505 micrometers , respectively. Intracavity SFG between the 1.064-micrometers and the oscillating 1.319-micrometers waves produces yellow radiation near 0.589 micrometers ; while, intracavity SHG of the 1.319- micrometers wave generates red radiation near 0.660 micrometers . Several KTP crystals are tried in the SFG experiment. A 8.5-mm long KTP crystal, cut at (theta) equals 79 degree(s) and (phi) equals 0 degree(s), yields a 10.5% energy conversion from the infrared pump to the yellow radiation. A 6.5-mm long KTP crystal, cut at (theta) equals 63 degree(s) and (phi) equals 0 degree(s), generates 12.5% conversion efficiency, and a 13-mm long crystal of the same cut converts 8% of the infrared pump into the visible. In the SHG experiment, a LiIO3 crystal is used, and the energy conversion to the red radiation is 9.5%. Maximum pump depletion is about 40% in both SFG and SHG experiments. Higher pump conversion is expected at higher pumping levels, and with a less lossy AgGaS2 crystal, a larger fraction of the depleted energy should be upconverted into useful visible light.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric C. Cheung, Eric C. Cheung, Karl W. Koch, Karl W. Koch, Gerald T. Moore, Gerald T. Moore, } "Frequency upconversion experiments in an optical parametric oscillator", Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995); doi: 10.1117/12.206480; https://doi.org/10.1117/12.206480

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