Correction of walk-off-induced wavefront distortion for continuous-wave laser

doi:10.1088/1674-1056/25/9/094211

Abstract We theoretically and experimentally investigate the wave front distortion in critically phase-matched continuous-wave (CW) second harmonic generation (SHG). Due to the walk-off effect in the nonlinear crystal, the generated second harmonic is extremely elliptical and quite non-Gaussian, which causes a very low matching and coupling efficiency in experiment. Cylindrical lenses and walk-off compensating crystals are adopted to correct distorted wave fronts, and obtain a good TEM₀₀ mode efficiently. Theoretically, we simulate the correction effect of 266-nm laser generated with SHG. The experiment results accord well with the theoretical simulation and an above 80% TEM₀₀ component is obtained for 266-nm continuous-wave laser with a 4.8°-walk-off angle in beta barium borate (BBO) crystal.

Keywords: optical nonlinearity walk-off effect wavefront distortion

Received: 02 February 2016
Accepted manuscript online:

PACS:	42.60.By	(Design of specific laser systems)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.72.Bj	(Visible and ultraviolet sources)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 91436103) and Research Programme of National University of Defense Technology, China (Grant No. JC15-02-03).

Corresponding Authors: Hongxin Zou
E-mail: hxzou@nudt.edu.cn

Cite this article:

Hongxin Zou(邹宏新), Guozhu Chen(陈国柱), Yue Wu(伍越), Yong Shen(沈咏), Qu Liu(刘曲) Correction of walk-off-induced wavefront distortion for continuous-wave laser 2016 Chin. Phys. B 25 094211

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Correction of walk-off-induced wavefront distortion for continuous-wave laser

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