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Quick and accurate sizing of particles 100-500 nm in diameter undergoing Brownian motions with concentration below 1 ppm in water has been successfully demonstrated using a self-mixing thin-slice Nd:GdVO4 laser with laser-diode pumping. A lower concentration limit as low as 0.05 ppm was achieved for 262-nm polystyrene latex spheres.
Detailed oscillation spectra and polarization properties of laser-diode-pumped ceramic Nd:YAG lasers were examined. Inherent segregation of lasing patterns into local modes possessing different polarization states and oscillation frequencies was observed. Single-frequency, linearly polarized stable oscillations were achieved by forcing the laser into Ince-Gaussian mode operation by adjusting azimuthal...
Highly sensitive, real-time detection of small particles in fluid flow has been demonstrated by using a laser-diode-pumped, self-mixing thin-slice Nd:GdVO4 laser. Power spectra of modulated laser output, reflecting the velocity distribution of liquid flow, due to the scattered light from small particles in fluid flow were observed.
The effect of average grain sizes on oscillation properties is studied in laser-diode-pumped miniature ceramic lasers. The inherent segregation of lasing patterns into local modes is found to be prevented in the case of ceramics with grains of the order of micrometer, resulting in linearly polarized TEM00 transverse mode oscillations.
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