Abstract

A phase-shifting homodyne interferometer with feedback control by heterodyne phase detection is developed. The backreflected beam from a reference flat with a small wedge angle and an internal heterodyne detection system are utilized to obtain heterodyne beat signals for the feedback error signal. Using a digital high-speed lock-in amplifier, interference fringe stabilization, and accurate $\pi /2$ phase shifts when micrometer-order vibrations are applied have been successfully demonstrated with a general nonpolarizing homodyne interferometer configuration.

© 2008 Optical Society of America

Phase-shifting interferometry with feedback control using heterodyne phase detection

Youichi Bitou
Opt. Lett. 33(16) 1777-1779 (2008)

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