Abstract
A unique method for double-pulsed holographic interferometry has been developed and employed in a meter-long theta-pinch experiment. Q-switching of two orthogonally polarized ruby laser beams, using the same lasing medium but different laser cavities, allows pulse separations of 0.2–100 μsec. The double-pulse operation with short pulse separation avoids many temporal aberrations seen in single-pulse systems and allows time differential interferograms of transient phenomena such as seen in theta-pinch plasmas. Orthogonal polarization of the two beams permits background fringe construction without the need for a mechanically introduced planar phase shift.
© 1977 Optical Society of America
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