Time-Resolved Femtosecond Degenerate Four-Wave Mixing in LiNbO3：Fe,Mg Crystal  

作　　者：王振华 张心正 许京军 吴强 乔海军 唐柏权 RUPP Romano 孔勇发 陈绍林 黄自恒 李冰 刘仕国 张玲 

机构地区：[1]Photonics Research Center, Institute of Physical Science, Nankai University, Tianjin 300071 [2]Ultrafast Photonics Laboratory, Teda Applied Physics School, Nankai University, Tianjin 300457 [3]Institute of Experimental Physics, Vienna University, A-1090 Wien, Austria [4]R&D Center for Photon-Electro Materials, Nankai University, Tianjin 300071

出　　处：《Chinese Physics Letters》2005年第11期2831-2833,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 60208003, and Alexander yon Humboldt Foundation.

摘　　要：Forward degenerate four-wave mixing （DFWM） processes are investigated with a femtosecond pulsed laser in lithium niobate crystal doubly-doped with magnesium and iron （LiNbO3：Fe, Mg）. The pulse energy dependence reveals a pure third-order nonlinear response, and the third-order nonlinear susceptibility x^（3） in the material is evaluated to be 4.96 × 10^-13 esu. The time-resolved DFWM process shows a response time of x^（3） shorter than 100fs, which is due to the nonresonant electronic nonlinearities. Our results indicate that LiNbO3 crystals have potentials for ultrafast real-time optical processing systems, which require a large and fast x^（3） optical nonlinearity.Forward degenerate four-wave mixing （DFWM） processes are investigated with a femtosecond pulsed laser in lithium niobate crystal doubly-doped with magnesium and iron （LiNbO3：Fe, Mg）. The pulse energy dependence reveals a pure third-order nonlinear response, and the third-order nonlinear susceptibility x^（3） in the material is evaluated to be 4.96 × 10^-13 esu. The time-resolved DFWM process shows a response time of x^（3） shorter than 100fs, which is due to the nonresonant electronic nonlinearities. Our results indicate that LiNbO3 crystals have potentials for ultrafast real-time optical processing systems, which require a large and fast x^（3） optical nonlinearity.

关 键 词：NONLINEAR OPTICAL SPECTROSCOPY TEMPORAL MEASUREMENTS PHASE-CONJUGATION SUSCEPTIBILITY HOLOGRAMS DYNAMICS 

分 类 号：O614.111[理学—无机化学]