Spatial gratings are recorded holographically by two femtosecond pump pulses at 388 nm in lithium niobate (LiNbO3) crystals and read out by a Bragg-matched, temporally delayed probe pulse at 776 nm. We claim, to our knowledge, the first holographic pump-probe experiments with subpicosecond temporal resolution for LiNbO3. An instantaneous grating that is due mostly to the Kerr effect as well as a long-lasting grating that results mainly from the absorption caused by photoexcited carriers was observed. The Kerr coefficient of LiNbO3 for our experimental conditions, i.e., pumped and probed at different wavelengths, was approximate to 1.0 x 10(-5) cm(2)/GW. (c) 2005 Optical Society of America.
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机译：空间光栅是通过在铌酸锂（LiNbO3）晶体中以388 nm的两个飞秒泵浦脉冲全息记录的，并通过在776 nm处的布拉格匹配，时间延迟的探测脉冲读出。据我们所知，我们对LiNbO3的亚皮秒时间分辨率进行了首次全息泵浦探针实验。观察到主要由Kerr效应引起的瞬时光栅以及主要由光激发载流子引起的吸收导致的长效光栅。在我们的实验条件下，即在不同波长下泵浦和探测的LiNbO3的Kerr系数约为1.0 x 10（-5）cm（2）/ GW。 （c）2005年美国眼镜学会。
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