Abstract

In order to make an optical-fiber-type laser-Doppler velocimeter (LDV) more compact, we propose the use of a laser diode as the coherent light source. To reduce the optical feedback on the laser source, a polarization-maintaining single-mode fiber was adopted. We have confirmed that the LDV system can be compact and also that it can have a velocity resolution of a few millimeters per second and a signal with a 20-dB signal-to-noise ratio, which are similar to the resolution and signal-to-noise ratio obtained with a He–Ne laser.

© 1984 Optical Society of America

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