2 May 1997 Numerical modeling of thermal effects in nonlinear crystals for high-average-power second harmonic generation
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The influence of thermally induced phase-mismatch in nonlinear crystals for frequency doubling caused by absorption of laser power is described. A numerical model is developed, which considers the spatial temperature distribution in the crystal and the corresponding wave-vector mismatch. For the temperature profile an approximate analytical expression is derived from the the heat-transfer equation in cylindrical symmetry. The conversion efficiency is calculated by solving the basic differential equations for frequency doubling with a spatial dependent wave-vector mismatch. Because the absorption coefficients are rather different at the fundamental and second harmonic wavelength, the heat-density in the crystal depends on the conversion efficiency and vice versa. Therefore an iteration method has to be used to calculate self-consistent solutions. Experimentally a Q- switched oscillator-amplifier-system with an average power of 200 W at 1064 nm is frequency doubled to an output of 103 W at 532 nm using a KTP crystal. The numerical calculations are in good agreement with the experimental results.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stefan Seidel, Stefan Seidel, Guido Mann, Guido Mann, "Numerical modeling of thermal effects in nonlinear crystals for high-average-power second harmonic generation", Proc. SPIE 2989, Modeling and Simulation of Higher-Power Laser Systems IV, (2 May 1997); doi: 10.1117/12.273671; https://doi.org/10.1117/12.273671


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