title: Three-channel three-dimensional self-mixing thin-slice solid-state laser-Doppler measurements.
abstract: We report successful real-time three-channel self-mixing laser-Doppler measurements with extreme optical sensitivity using a laser-diode-pumped thin-slice Nd:GdVO(4) laser in the carrier-frequency-division-multiplexing scheme with three pairs of acoustic optical modulators (i.e., frequency shifters) and a three-channel FM-wave demodulation circuit. We demonstrate (1) simultaneous independent measurement of three different nanometer-vibrating targets, (2) simultaneous measurements of small particles in Brownian motion from three directions, and (3) identification of the velocity vector of small particles moving in water flowing in a small-diameter glass pipe.
authors.affiliation: Department of Human and Information Science, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ohtomo
authors.forename: Seiichi
authors.initials: S
authors.lastname: Sudo
authors.forename: Kenju
authors.initials: K
authors.lastname: Otsuka