Time-Resolved Femtosecond Degenerate Four-Wave Mixing in LiNbO3:Fe,Mg Crystal
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WANG Zhen-Hua,
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ZHANG Xin-Zheng,
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XU Jing-Jun,
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WU Qiang,
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QIAO Hai-Jun,
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TANG Bai-Quan,
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RUPP Romano,
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KONG Yong-Fa,
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CHEN Shao-Lin,
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HUANG Zi-Heng,
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LI Bing,
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LIU Shi-Guo,
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ZHANG Ling
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Abstract
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 4.96×10-13esu. 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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