Abstract
Two acoustooptical deflectors placed orthogonal to each other allow the scanning of a laser beam in two dimensions without mechanical movement. A complete scan is possible in 50 μs, providing a spatial resolution of 20 × 125 spots. This is used to follow the development of plumes generated by laser vaporization from a surface. Both Na atoms and Pb2 dimers can be monitored by absorption over the lifetime of the plume. The use of a second channel in the transient digitizer allows normalization to correct for variations in laser intensity and deflection efficiencies during the scan. Concentration maps for each can thus be obtained.
© 1987 Optical Society of America
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