The implementation of a new type of phase-shifting, self-referencing interferometer that simultaneously achieves the phase shift and separation of beams with a stationary diffraction grating is described. The capabilities of stroboscopic interferometry are demonstrated with results from an experiment in which the rapidly varying surface deformations of a sonically activated pellicle mirror are measured in a time-sliced fashion at 50-μsec intervals.
© 1987 Optical Society of America
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