Effect of spatial refractive-index nonuniformities existed in a large-scale rapid growth KDP crystal on third-harmonic conversion |
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| Authors: | Wei Han Lidan Zhou Fang Wang Fuquan Li Keyu Li Liquan Wang Bin Feng Qihua Zhu Jingqin Su Gong Mali |
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| Institution: | 1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;2. Center of Photonics and Electronics, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China |
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| Abstract: | Effect of spatial refractive-index nonuniformities existed in a large-scale rapid growth KDP crystal (a type I frequency doubler at the wavelength of 1053 nm) on third-harmonic conversion is studied. Spatial refractive-index nonuniformities due to imperfections in the crystal structure which prohibit the attainment of phase matching at all locations in the crystal are measured with the orthogonal polarization interferometry technique. And a third-harmonic conversion experiment is conducted on a large-scale facility to investigate the influence of refractive-index nonuniformities on conversion efficiency and third-harmonic beam nearfield. According to the experimental results, refractive-index nonuniformities in this large-scale rapid growth KDP doubler do not reduce the third-harmonic conversion efficiency, but affect the third-harmonic beam nearfield. |
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| Keywords: | Third-harmonic conversion KDP crystal Rapid growth Refractive-index nonuniformity |
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