Abstract
For further interferometric application on diffusive target, the phase fluctuation of a solid-state laser submitted to frequency shifted optical feedback is analyzed both theoretically and experimentally. As a drawback of the laser high sensitivity to optical feedback, the phase fluctuations induced by a strong phase-amplitude coupling noise are several orders of magnitude higher than the standard interferometric phase noise induced by the laser frequency width (Schawlow-Townes limit). Nevertheless, by sending a few milliwatts output power microchip laser beam on a diffusive target with an effective reflectivity of ${10}^{\ensuremath{-}9}$, a target displacement precision of $0.1\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}∕\sqrt{\mathrm{Hz}}$ has been experimentally determined.
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