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 Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract When a pump laser beam strikes the surface of a nonlinear crystal with modulated second-order nonlinearity, various nonlinear diffraction phenomena occur, with nonlinear Raman-Nath diffraction (NRND) being a prominent example. In this study, we use an 800-nm Ti:sapphire femtosecond laser beam to pump the surface of a periodically poled lithium niobate (PPLN) crystal thin-plate nonlinear grating. By rotating the crystal, we change the incidence angle and observe and measure the exit angle, polarization, and power of NRND spots on the other side of the crystal. The experiment shows that NRND characteristics are highly sensitive to the incidence angle of the pump laser beam, which are consistent with the theoretical prediction. We expect that this research will advance the understanding of nonlinear diffraction and provide valuable insights for nonlinear optical interaction in complicated geometric and physical configurations.
Fund: Project supported by the Science and Technology Project of Guangdong Province, China (Grant No. 2020B010190001), the National Natural Science Foundation of China (Grant No. 12434016), and the National Funded Postdoctoral Researcher Program (Grant No. GZB20240785).
Corresponding Authors:
Lihong Hong
E-mail: honglihong@siom.ac.cn
Cite this article:
Jiacheng Li(李嘉诚), Lihong Hong(洪丽红), Yu Zou(邹娱), Jianluo Chen(陈健洛), and Zhi-Yuan Li(李志远) Nonlinear Raman-Nath diffraction of inclined femtosecond laser by periodically poled lithium niobate nonlinear grating 2025 Chin. Phys. B 34 054205
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