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28 May 2009 Numerical study and optimization of third harmonics generation in two-sectioned periodically poled LiTaO3
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Abstract
The feasibility of the cascaded second and third harmonic generation in two-sectioned periodically poled lithium tantalate crystal is analyzed. Simulation using computational non-linear optical model rigorously coupled with the thermal model suggests that 20-30 % efficiency can be achieved for 3 W power 2.2 ns pulsed 1.064 μm laser operating at frequency 6.8x103 Hz if the crystal is composed with optimized section lengths for: (i) 8.0 μm periodic first-order SHG structure and (ii) 6.6 μm periodic third-order THG structure. Significant inhibition of THG efficiency can be due to the heat release of SH and TH along the crystal, associated thermal dephasing and lenzing which can be effectively inhibited by decreasing the crystal cross-section dimensions to the practical minimum of 200x200 μm.
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Oleg A. Louchev and Satoshi Wada "Numerical study and optimization of third harmonics generation in two-sectioned periodically poled LiTaO3", Proc. SPIE 7354, Nonlinear Optics and Applications III, 73540Y (28 May 2009); https://doi.org/10.1117/12.820585
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