Ultrahighly sensitive laser-Doppler velocity meter with a diode-pumped Nd:YVO4 microchip laser

S. Okamoto, H. Takeda, F. Kannari

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)


    Extremely high sensitivity of a diode-pumped microchip Nd:YVO4 laser to external light injection is demonstrated in optical detection of Doppler shift from a moving object. Intensity modulation induced by reflected scattered light from a rotating object at the Doppler-shift frequency is measured for a 1-mm-long diode-pumped Nd:YVO4 laser. When adjusting the diode pump power so that the relaxation oscillation frequency is resonant to the Doppler-shift frequency, the minimum detectable intensity of scattered light injected back into the microchip laser can be <-170 dB weaker than the intracavity laser intensity.

    Original languageEnglish
    Pages (from-to)3116-3120
    Number of pages5
    JournalReview of Scientific Instruments
    Issue number5
    Publication statusPublished - 1995 Dec 1

    ASJC Scopus subject areas

    • Instrumentation

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