NONVOLATILE PHOTOREFRACTIVE SPECTRAL HOLOGRAPHY

We demonstrate nonvolatile storage of femtosecond pulses in a photoref ractive LiNbO3 crystal with recording and readout of spectral hologram s at wavelengths of 460 and 920 nm, respectively. No degradation was o bserved after 24 h of continuous readout. We also show that we can rea lize the time-lens effect with our system by appropriately setting the ratio of the recording and the reconstruction wavelengths and the spe ctral resolution of the recording and the reconstruction processes. (C ) 1998 Optical Society of America.