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  • Title: Picometer positioning system based on a zooming interferometer using a femtosecond optical comb.
    Author: Kajima M, Matsumoto H.
    Journal: Opt Express; 2008 Feb 04; 16(3):1497-506. PubMed ID: 18542225.
    Abstract:
    A positioning system based on a new zooming interferometer was developed for calibrating ultrahigh-resolution linear encoders. In the system, the positioning resolution is scaled down from that of the driving stage to that of the controlled stage by a zooming ratio that is determined by the ratio between the wavelengths of the optical sources for the zooming interferometer, so that the resolution in the controlled stage becomes very high. A femtosecond optical comb is used to stabilize two external-cavity diode lasers that are used as optical sources for the interferometer. The system realized a resolution of better than 30 pm and a stability of 1 nm.
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