Influence of temporal pulse shape on second harmonic generation

Etsuji Ohmura; Kazufumi Nomura; Isamu Miyamoto

doi:10.1117/12.540933

18 November 2003 Influence of temporal pulse shape on second harmonic generation

Etsuji Ohmura, Kazufumi Nomura, Isamu Miyamoto

Proceedings Volume 5063, Fourth International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.540933
Event: Fourth International Symposium on Laser Precision Microfabrication, 2003, Munich, Germany

Abstract

Frequency conversion technique using nonlinear optical crystals is indispensible to solid-state laser applications. It is well known that the conversion efficiency is very sensitive to temperature change of crystal, which is caused by laser absorption. We have been analyzing problems of second harmonic generation (SHG) by coupling the electric field to the temperature field. In this study, temporal pulse-shape dependence of SHG was investigated theoretically, and Gaussian pulse and rectangular pulse were compared. Main conclusions obtained are as follows: (1) Both conversion efficiencies with Gaussian and rectangular pulses fluctuate with irradiation time, however the former fluctuation is slower and more gentle. (2) Pulse of output second harmonic fluctuates most remarkably at the center, where power density of incident fundamental is highest, in the Gaussian pulse. (3) As a result, pre-pulse and post-pulse are generated at both sides of the main pulse. (4) Such distortion of output pulse shape becomes more remarkable as power density increases.

Citation Download Citation

Etsuji Ohmura, Kazufumi Nomura, and Isamu Miyamoto "Influence of temporal pulse shape on second harmonic generation", Proc. SPIE 5063, Fourth International Symposium on Laser Precision Microfabrication, (18 November 2003); https://doi.org/10.1117/12.540933

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