Abstract

We describe a novel method for the measurement of spatially two-dimensional temporal amplitude correlation function of two coherent short light pulses with picosecond resolution in which the light pulses are recorded in a volume-holographic medium and the recorded information is read out by direct measurement of the spatial distribution of the grating formed in the medium. The feasibility of this method was experimentally proved by means of a photorefractive LiNbO₃:Fe crystal and a 3.5-ps frequency-doubled mode-locked Nd:YAG laser. We measured the diffraction of a cw He–Ne laser by the grating formed in the crystal and calculated its envelope function by inversely solving coupled-wave equations.

© 1997 Optical Society of America

Grating formation with very short pulses in photorefractive materials: weak excitation limit

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