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Implementation of a Reference Interferometer for Nanodetection
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Laser wavelength comparison by high resolution interferometry.

H P Layer, R D Deslattes, W G Schweitzer

    Applied Optics
    |February 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    High-resolution interferometry precisely measured the wavelength ratio between methane-stabilized (3.39 microm) and iodine-stabilized (633 nm) He-Ne lasers. This extends the frequency scale into the visible spectrum with high accuracy.

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    Area of Science:

    • Metrology
    • Laser Physics
    • Spectroscopy

    Background:

    • Accurate wavelength ratios are crucial for extending frequency scales.
    • Helium-Neon (He-Ne) lasers stabilized by molecular absorption offer high precision.
    • Previous measurements had limitations in accuracy.

    Purpose of the Study:

    • To determine the wavelength ratio between two specific He-Ne laser systems with high accuracy.
    • To extend the frequency scale based on the cesium oscillator into the visible spectrum.
    • To improve upon previous wavelength ratio measurements.

    Main Methods:

    • High-resolution interferometry was employed.
    • Optical beat frequency and microwave sideband techniques were used to determine fractional and integer parts of the ratio, respectively.
    • Conventional third derivative peak seeking servoes stabilized laser and cavity lengths.

    Main Results:

    • The measured wavelength ratio is 5.359 049 260 6 (0.000 2 ppm).
    • Reproducibility of the control system and optics was achieved to a few parts in 10(12).
    • Systematic errors from cavity mirror curvature limited accuracy to 2 parts in 10(10).

    Conclusions:

    • The high-accuracy wavelength ratio agrees with previous lower-accuracy results.
    • This measurement allows a provisional extension of the frequency scale into the visible spectrum.
    • The study demonstrates the capability of molecularly stabilized lasers for precise metrology.