Abstract

The application of the picosecond transient grating technique¹ to the investigation of exciton migration² works in the following manner. A picosecond time scale pulse of light is split in two. The paths of the resulting pulses are arranged to have a known angle between them and to intersect simultaneously in the sample. Interference between the two coherently related pulses creates an optical fringe pattern in the sample such that the intensity of light varies sinusoidally in the beam overlap region. The interference fringe spacing is determined by the angle between the beams and by the wavelength of the light.

© 1984 Optical Society of America