BANDWIDTH STUDY OF VOLUME HOLOGRAPHY IN PHOTOREFRACTIVE INP-FE FOR FEMTOSECOND PULSE READOUT AT 1.5 MU-M

The Bragg selectivity of volume holograms makes them not well suited f or many Fourier imaging processing applications in the space domain be cause they perform the function of a spatial filter and limit the fiel d of view. Similarly, for femtosecond pulse holography they reduce the spectral bandwidth of the diffracted signal. However, we show both th eoretically and experimentally that it is much easier in the frequency domain than in the space domain to achieve a large enough diffraction bandwidth of volume holograms for the bandwidth of 100-fs pulses to b e used for frequency-domain femtosecond pulse shaping. The experiments were performed by nondegenerate four-wave mixing in photorefractive I nP:Fe with femtosecond readout at 1.5 mu m. (C) 1998 Optical Society o f America [S0740-3224(98)02010-4].