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The first harmonic generation and linear susceptibility tensor variation at crystal boundary
Author(s): Yan Guan; Fang Wang; Ying Yang; Den'en Wang; Xin Zhang; Qiang Yuan; Dongxia Hu; Xuewei Deng; Huaijin Ren
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Paper Abstract

It’s widely agreed that optical characteristics at crystal boundary may change comparing to the internal part of bulk crystal but, as far as we know, sometimes the phenomenon, for example, the variation of susceptibility usually can’t be intuitively, simply presented in experiments. Recently, we observe a kind of special harmonic generation which is at the same wavelength as incident light. Besides, this kind of harmonic generation behaves in a similar way with nonlinear Cherenkov radiation, thus we call it linear Cherenkov radiation (LCR). We theoretically predict and calculate the phase-matching scheme and radiation path of LCR. In our experiment, we employ a polished KDP to verify our theory about the conversion of polarization in this process, and the phenomenon also help to rule out the possibility of birefringence at boundary. Combining with the coupling wave equation, we can derive new elements in linear susceptibility tensor according to the polarization states of incident light and LCR. The result tells us the linear susceptibility at the KDP boundary is assuredly different from that in bulk crystal, and this is mainly because of the breakdown of crystal symmetry at boundary, in our opinion. The existence of LCR is evidence of the variation of linear susceptibility. And in return, we could use this phenomenon to probe the non-zero elements in the tensor.

Paper Details

Date Published: 17 May 2019
PDF: 11 pages
Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111703Z (17 May 2019); doi: 10.1117/12.2534025
Show Author Affiliations
Yan Guan, Laser Fusion Research Ctr. (China)
Fang Wang, Laser Fusion Research Ctr. (China)
Ying Yang, Laser Fusion Research Ctr. (China)
Den'en Wang, Laser Fusion Research Ctr. (China)
Xin Zhang, Laser Fusion Research Ctr. (China)
Qiang Yuan, Laser Fusion Research Ctr. (China)
Dongxia Hu, Laser Fusion Research Ctr. (China)
Shanghai Jiao Tong Univ. (China)
Xuewei Deng, Laser Fusion Research Ctr. (China)
Shanghai Jiao Tong Univ. (China)
Huaijin Ren, Institute of Applied Electronics (China)


Published in SPIE Proceedings Vol. 11170:
14th National Conference on Laser Technology and Optoelectronics (LTO 2019)
Jianqiang Zhu; Weibiao Chen; Zhenxi Zhang; Minlin Zhong; Pu Wang; Jianrong Qiu, Editor(s)

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