Third harmonic generation of high-energy large-aperture one microlaser and its spatial beam property investigation

Baoqiang Zhu; Tingyu Zhan; Zhen Gu; Tao Wang; Liejia Qian

doi:10.1117/12.424648

1 May 2001 Third harmonic generation of high-energy large-aperture one microlaser and its spatial beam property investigation

Baoqiang Zhu, Tingyu Zhan, Zhen Gu, Tao Wang, Liejia Qian

Author Affiliations +

Proceedings Volume 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials; (2001) https://doi.org/10.1117/12.424648
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

In this paper we report on the design and performance of the large KDP crystal plates that were constructed to convert 1.054 micrometer laser beam to its third harmonic. The KDP crystals were AR-coated by sol-gel films. Type II/type II phase-matching configurations for cascade frequency doubling and tripling have been implemented at 250 mm aperture. High conversion efficiencies approaching to 70% were achieved. Focusing properties of harmonic beam are also investigated in the paper. Based on the transfer of electric-field amplitude and phase ripple in frequency tripling, simple formulas are derived for the harmonic laser beam-quality factor, M_3(omega )², with an arbitrary fundamental beam incident to ideal nonlinear crystals. Harmonic beam-quality is generally degraded, while the beam divergence is similar to that of the fundamental after a nonlinear frequency-conversion process. For practical crystals with periodic surface ripples due to their machining, a multi-order diffractive model is presented to study the focusing properties of harmonic beam. Predictions of the theories are shown to be in excellent agreement with full numerical simulations of tripling.

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Baoqiang Zhu, Tingyu Zhan, Zhen Gu, Tao Wang, and Liejia Qian "Third harmonic generation of high-energy large-aperture one microlaser and its spatial beam property investigation", Proc. SPIE 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials, (1 May 2001); https://doi.org/10.1117/12.424648

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