Abstract

We present a novel interferometric technique for the accurate measurement of acoustic velocity based on an optical phase shifter consisting of a pair of properly aligned acousto-optic modulators (AOMs). Results for the z-axis longitudinal mode velocities in lead molybdate $\left({\text{PbMoO}}_4\right)$ and tellurium dioxide $\left({\text{TeO}}_{\text{2}}\right)$ at $80\text{\hspace{0.17em} MHz}$ are reported and compared with earlier results. A longstanding inconsistency in the ${\text{PbMoO}}_4$ velocity is resolved.

© 2007 Optical Society of America

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