| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Polarization-sensitive nonlinear optical diffraction |
| Jianluo Chen(陈健洛)1,†, Lihong Hong(洪丽红)2,1,†,‡, Yu Zou(邹娱)1, Jiacheng Li(李嘉诚)1, and Zhi-Yuan Li(李志远)1 |
1 School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China;
2 State Key Laboratory of Ultra-intense laser Science and Technology, Shanghai Institude of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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Abstract When a laser beam is incident on a nonlinear grating with a laterally modulated second-order nonlinear coefficient, nonlinear diffraction of the noncollinear second-harmonic generation (SHG) signal occurs, with Raman-Nath nonlinear diffraction (NRND) being a prominent example. As these SHG NRND processes involve coupling between the fundamental-wave pump laser vectorial field and the SHG laser vectorial field through the second-order nonlinearity second-rank tensor of the nonlinear crystal, the nonlinear interaction between light and the nonlinear grating can be manipulated by adjusting the polarization state of the pump laser. In this paper, we derive the relationship between the polarization state of the incident light and the generated nonlinear diffraction signal based on the nonlinear coupled wave equation and experimentally validate the predicted diffraction characteristics. The results show that the optical properties of each order of NRND are highly sensitive to the polarization angle of the incident pump laser beam.
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Received: 21 December 2024
Revised: 26 February 2025
Accepted manuscript online: 24 March 2025
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PACS:
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42.65.Sf
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(Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)
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| Fund: Project supported by Science and Technology Project of Guangdong (Grant No. 2020B010190001), the National Natural Science Foundation of China (Grant No. 12434016), and National Funded Postdoctoral Researcher Program (Grant No. GZB20240785). |
Corresponding Authors:
Lihong Hong
E-mail: honglihong@siom.ac.cn
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Cite this article:
Jianluo Chen(陈健洛), Lihong Hong(洪丽红), Yu Zou(邹娱), Jiacheng Li(李嘉诚), and Zhi-Yuan Li(李志远) Polarization-sensitive nonlinear optical diffraction 2025 Chin. Phys. B 34 064204
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