The application of a Michelson interferometer with a self-pumped phase-conjugate mirror to measure small vibration amplitudes of a rough surface is described. The distorted wave front of the light that is diffusely reflected from the rough surface is restored by phase conjugation to provide an interference signal with a high signal-to-noise ratio. The vibration amplitudes of a stainless-steel sample are measured with a precision of ~5 nm.
© 2000 Optical Society of America
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(190.5040) Nonlinear optics : Phase conjugation
Xiangzhao Wang, Osami Sasaki, Takamasa Suzuki, and Takeo Maruyama, "Measurement of Small Vibration Amplitudes of a Rough Surface by an Interferometer with a Self-Pumped Phase-Conjugate Mirror," Appl. Opt. 39, 4593-4597 (2000)