We demonstrate nonvolatile storage of femtosecond pulses in a photorefractive LiNbO3 crystal with recording and readout of spectral holograms at wavelengths of 460 and 920 nm, respectively. No degradation was observed after 24 h of continuous readout. We also show that we can realize the time-lens effect with our system by appropriately setting the ratio of the recording and the reconstruction wavelengths and the spectral resolution of the recording and the reconstruction processes. (C) 1998 Optical Society of America. [References: 15]
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