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Quartz tuning forks are high-quality mechanical oscillators widely used inlow temperature physics as viscometers, thermometers and pressure sensors. Wedemonstrate that a fork placed in liquid helium near the surface of solidhelium is very sensitive to the oscillations of the solid-liquid interface. Wedeveloped a double-resonance read-out technique which allowed us to detectoscillations of the surface with an accuracy of 1 Angs in 10 sec. Using thistechnique we have investigated crystallization waves in 4He down to 10 mK. Incontrast to previous studies of crystallization waves, our measurement schemehas very low dissipation, on the order of 20 pW, which allows us to carry outexperiments even at sub-mK temperatures. We propose to use this scheme in thesearch for crystallization waves in 3He, which exist only at temperatures wellbelow 0.5 mK.

Quartz tuning fork as a probe of surface waves