Fast phase modulation has been achieved in a Michelson interferometer by attaching a lightweight reference mirror to a piezoelectric stack and driving the stack at a resonance frequency of about 125 kHz. The electrical behavior of the piezo stack and the mechanical properties of the piezo-mirror arrangement are described. A displacement amplitude at resonance of about 350 nm was achieved using a standard function generator. Phase drift in the interferometer and piezo wobble were readily circumvented. This approach to phase modulation is less expensive by a factor of roughly 50 than one based on an electro-optic effect.
© 2001 American Institute of Physics (AIP)
Hoeling, Barbara M., Andrew D. Fernandez, Richard C. Haskell, and Daniel C. Petersen. "Phase modulation at 125 kHz in a Michelson interferometer using an inexpensive piezoelectric stack driven at resonance." Review of Scientific Instruments 72.3 (2001): 1630-1633. DOI: 10.1063/1.1347375