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