Abstract
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
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