| Time-Resolved Femtosecond Degenerate Four-Wave Mixing in LiNbO3：Fe,Mg Crystal |
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| 作者姓名： | 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 |
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| 作者单位： | [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 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 60208003, and Alexander yon Humboldt Foundation. |
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| 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.
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| 关 键 词： | LiNbO3：Fe Mg 晶体化合物 退化波混合 脉冲激光 脉冲能量 |
| 收稿时间： | 2005-07-06 |
| 修稿时间： | 2005-07-06 |
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