Theoretical analysis of SHG conversion efficiency of nonlinear optical crystal with Gaussian beam irradiation

Kazufumi Nomura; Etsuji Ohmura; Isamu Miyamoto

doi:10.1117/12.486593

19 February 2003 Theoretical analysis of SHG conversion efficiency of nonlinear optical crystal with Gaussian beam irradiation

Kazufumi Nomura, Etsuji Ohmura, Isamu Miyamoto

Author Affiliations +

Proceedings Volume 4830, Third International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.486593
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan

Abstract

For the first step of our study, temperature dependence of SHG conversion efficiency has been analyzed theoretically on the supposition of uniform intensity beam. The results are presented in the paper appeared in the same proceedings. In this paper, the analysis was carried out two-dimensionally with an axisymmetrical model based on the previous one-dimensional model, applying the paraxial approximation. Two-dimensional temperature distribution induced by laser absorption and variation of the conversion efficiency of KDP crystals were analyzed quantitatively during repetition irradiation of pulse laser. Main results are summarized as follows: (1) Depending on SHG and its inverse conversion, temperature of the crystal with Gaussian beam irradiation fluctuates remarkably in the axial direction in the central part of crystal. (2) During repetition irradiation of Gaussian beam, heat conduction in the radial direction prevents temperature from rising in the central part of crystal. (3) The conversion efficiency for a Gaussian beam stays relatively high for a long period, compared with that for uniform beam.

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Kazufumi Nomura, Etsuji Ohmura, and Isamu Miyamoto "Theoretical analysis of SHG conversion efficiency of nonlinear optical crystal with Gaussian beam irradiation", Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); https://doi.org/10.1117/12.486593

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