Journal
APPLIED OPTICS
Volume 44, Issue 9, Pages 1709-1714Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.44.001709
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We demonstrate real-time two-channel self-mixing laser-Doppler measurement with extreme optical sensitivity using a laser-diode-pumped thin-slice LiNdP4O12 laser. Successful carrier-frequency-division-multiplexed two-channel operations are realized by using one laser, two sets of optical frequency shifters, and a two-channel frequency-modulated-wave demodulation circuit. Simultaneous independent measurements of vibrations of speakers and averaged motions of small Brownian particles in different scattering cells are demonstrated. Self-mixing photon correlation spectroscopy of particle size distributions is also discussed. (c) 2005 Optical Society of America.
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