Two-channel self-mixing laser Doppler measurement with carrier-frequency-division multiplexing.
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.
Otsuka
Kenju
K
Department of Human and Information Science, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan. ootsuka@keyaki.cc.u-tokai.ac.jp
Abe
Kazutaka
K
Sano
Natsumi
N
Sudo
Seiichi
S
Ko
Jing-Yuan
JY