Synergic action of linear dispersion, second-order nonlinearity, and third-order nonlinearity in shaping the spectral profile of a femtosecond pulse transporting in a lithium niobate crystal  

作　　者：LIHONG HONG YUANYUAN LIU ZHI-YUAN LI 

机构地区：[1]State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China [2]School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510640,China

出　　处：《Photonics Research》2024年第4期774-783,共10页光子学研究（英文版）

基　　金：Science and Technology Project of Guangdong(2020B010190001);National Natural Science Foundation of China (11974119);Guangdong Province Introduction of Innovative R&D Team (2016ZT06C594);National Key Research and Development Program of China(2018YFA0306200)。

摘　　要：We present a detailed theoretical and numerical analysis on the temporal-spectral-spatial evolution of a highpeak-power femtosecond laser pulse in two sets of systems:a pure lithium niobate(LN)plate and a periodically poled lithium niobate(PPLN)plate.We develop a modified unidimensional pulse propagation model that considers all the prominent linear and nonlinear processes and carried out the simulation process based on an improved split-step Fourier transformation method.We theoretically analyze the synergic action of the linear dispersion effect,the second-order nonlinearity(2nd-NL)second-harmonic generation(SHG)effect,and the third-order nonlinearity(3rd-NL)self-phase modulation(SPM)effect,and clarify the physical mechanism underlying the peculiar and diverse spectral broadening patterns previously reported in LN and PPLN thin plate experiments.Such analysis and discussion provides a deeper insight into the synergetic contribution of these linear and nonlinear effects brought about by the interaction of a femtosecond laser pulse with the LN nonlinear crystal and helps to draw a picture to fully understand these fruitful optical physical processes,phenomena,and laws.

关 键 词：PULSE NONLINEARITY LITHIUM 

分 类 号：TN24[电子电信—物理电子学] TQ131.11[化学工程—无机化工]