Doppler homodyne detection of the velocity of scattering objects based on a semiconductor laser with a fiber channel

摘要

A number of configurations of a Doppler velocimeter based on a semiconductor laser with a fiber channel have been implemented and the main parameters related to the fiber specificity of the outer arm of the optical system were analyzed. The efficiency of a homodyne optical system with a semiconductor laser as a radiation source and a fiber channel in the outer arm of the velocimeter in the velocity range of 0.1-100 mm/s is demonstrated. The maximum signal-to-noise values at the Doppler shift frequency of more than 15-20 dB allow us to conclude that it is possible to implement an effective system for measuring the velocity of scattering objects, provided that there is an additional pre-amplification in the signal processing channel and that the noise excitation of the laser emitter is prevented. (C) 2018 Optical Society of America.