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Laser Effect Used to Detect Particles in Suspension

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Intensity modulation in self-mixing microchip laser identifies plankton.

Hank Hogan

A team at Tokai University in Hiratsuka and Shizuoka, Japan, and from National Kaohsiung Normal University in Kaohsiung, Taiwan, has demonstrated that the intensity modulation in a laser can be used to estimate the size and concentration of organic and inorganic particles in a fluid. Applications of the technique could include the characterization of biological species, a possibility they established by capturing the motion of phytoplankton in seawater. In the scheme, the researchers monitor the beat signals due to interference between a lasing field and frequency-shifted scattered...Read full article

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    Published: April 2006
    microchip laserResearch & TechnologyTech PulseTokai UniversityLasers

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