Pulsed laser second harmonic generation and thermal dephasing in periodically poled crystals

Oleg A. Louchev; Nan Ei Yu; Sunao Kurimura; Kenji Kitamura

doi:10.1117/12.638211

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16 January 2006 Pulsed laser second harmonic generation and thermal dephasing in periodically poled crystals

Oleg A. Louchev, Nan Ei Yu, Sunao Kurimura, Kenji Kitamura

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Proceedings Volume 6038, Photonics: Design, Technology, and Packaging II; 60380S (2006) https://doi.org/10.1117/12.638211
Event: Microelectronics, MEMS, and Nanotechnology, 2005, Brisbane, Australia

Abstract

Computational study of nanosecond pulse laser radiation in periodically poled LiNbO₃ and LiTaO₃ crystals reveals the complex spacio-temporal evolution of the 1.064 μm fundamental harmonic (FH) and second harmonic (SH) energy fields with associated temperature fields, leading to the thermal dephasing and inhibition of second harmonic generation (SHG). The investigated range of the laser input power is W₀=0.5-50 W (with the pulse energy Q₀=0.01-1 mJ/pulse and repetition rate of 50 kHz). For input laser powers W₀>10 W the FH and SH energy fields are found to strongly couple with non-uniform temperature field leading to significant thermal dephasing and SHG efficiency loss. Heat generation and temperature distributions also exhibit very significant non-uniformities along and across the laser beam, maximizing at the rear or inside the crystal, depending on the input power. Performed study shows the feasibility of the effective thermal control with temperature gradient along the crystal allowing one to maintain (i) the irradiated zone within the temperature tolerance range and (ii) high SHG efficiency under high input laser powers.

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Oleg A. Louchev, Nan Ei Yu, Sunao Kurimura, and Kenji Kitamura "Pulsed laser second harmonic generation and thermal dephasing in periodically poled crystals", Proc. SPIE 6038, Photonics: Design, Technology, and Packaging II, 60380S (16 January 2006); https://doi.org/10.1117/12.638211

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