Abstract
A closed-loop phase-shifting Fizeau-type interferometer at was constructed with the direct frequency modulation of laser diodes.
The interferometer is servo controlled fully in the phase domain where optical
phases are detected by a two-frequency optical heterodyne method. Stepwise
phase shifting was accomplished with good stabilization against external disturbances
(vibration, air flow, etc.) and laser frequency fluctuations.
© 1998 Optical Society of America
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