Abstract
We describe a sensitive and inexpensive vibrometer based on optical feedback by
diffuse scattering to a single-mode diode laser. Fluctuations in the diode
laser’s operating frequency that are due to scattered light from a vibrating
surface are used to detect the amplitude and frequency of surface vibrations. An
additional physical vibration of the laser provides an absolute amplitude
calibration. The fundamental bandwidth is determined by the laser response time
of roughly 10−9 s. A noise floor of 0.23 nm/Hz1/2 at 30
kHz with 5 × 10−5 of the incident light returning is demonstrated.
This instrument provides an inexpensive and sensitive method of noncontact
measurement in solid materials with low or uneven reflectivity. It can be used
as a vibration or velocity sensor.
© 1996 Optical Society of America
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