Abstract
There exist many fascinating ultrafast solid- state chemical and physical processes that have gone largely unstudied because of their irreversible nature. We report a novel transient-grating technique in -which an entire ultrafast decay can be taken in a single shot. The delay time in this technique is encoded spatially by using excitation beams that are not focused in the plane of their propagation, much as in single-shot autocorrelation techniques.1 However, in our technique the excitation beams are incident upon opposite sides of the sample medium (Fig. 1). The grating is read by a probe beam that propagates perpendicular to the direction of spatial encoding (90° away from one of the excitation beams along the Bragg cone). The spatially encoded signal is then collected by an array detector, which can either detect a single shot or integrate the signal over many shots.
© 1993 Optical Society of America
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