The first harmonic generation and linear susceptibility tensor variation at crystal boundary

Yan Guan; Fang Wang; Ying Yang; Den'en Wang; Xin Zhang; Qiang Yuan; Dongxia Hu; Xuewei Deng; Huaijin Ren

doi:10.1117/12.2534025

17 May 2019 The first harmonic generation and linear susceptibility tensor variation at crystal boundary

Yan Guan, Fang Wang, Ying Yang, Den'en Wang, Xin Zhang, Qiang Yuan, Dongxia Hu, Xuewei Deng, Huaijin Ren

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111703Z (2019) https://doi.org/10.1117/12.2534025
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

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.

Citation Download Citation

Yan Guan, Fang Wang, Ying Yang, Den'en Wang, Xin Zhang, Qiang Yuan, Dongxia Hu, Xuewei Deng, and Huaijin Ren "The first harmonic generation and linear susceptibility tensor variation at crystal boundary", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111703Z (17 May 2019); https://doi.org/10.1117/12.2534025

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KEYWORDS

Crystals

Polarization

Harmonic generation

Laser crystals

Nonlinear crystals

Surface finishing

Photography

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