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

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

中国物理B ›› 2016, Vol. 25 ›› Issue (9): 94211-094211.doi: 10.1088/1674-1056/25/9/094211

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

Hongxin Zou(邹宏新), Guozhu Chen(陈国柱), Yue Wu(伍越), Yong Shen(沈咏), Qu Liu(刘曲)

Department of Physics, The National University of Defense Technology, Changsha 410073, China

收稿日期:2016-02-02 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: Hongxin Zou E-mail:hxzou@nudt.edu.cn
基金资助:
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).

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

Hongxin Zou(邹宏新), Guozhu Chen(陈国柱), Yue Wu(伍越), Yong Shen(沈咏), Qu Liu(刘曲)

Department of Physics, The National University of Defense Technology, Changsha 410073, China

Received:2016-02-02 Online:2016-09-05 Published:2016-09-05
Contact: Hongxin Zou E-mail:hxzou@nudt.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: optical nonlinearity, walk-off effect, wavefront distortion

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.

Key words: optical nonlinearity, walk-off effect, wavefront distortion

中图分类号: (Design of specific laser systems)

42.60.By

42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.72.Bj (Visible and ultraviolet sources)

邹宏新, 陈国柱, 伍越, 沈咏, 刘曲. Correction of walk-off-induced wavefront distortion for continuous-wave laser[J]. 中国物理B, 2016, 25(9): 94211-094211.

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[J]. Chin. Phys. B, 2016, 25(9): 94211-094211.

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

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

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