Abstract
Spatial gratings are recorded holographically by two femtosecond pump pulses at 388 nm in lithium niobate 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 . 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 for our experimental conditions, i.e., pumped and probed at different wavelengths, was .
© 2005 Optical Society of America
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