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Chin. Phys. B, 2016, Vol. 25(9): 094211    DOI: 10.1088/1674-1056/25/9/094211
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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
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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