Abstract
A unique 30-meter laser strainmeter is described. The system uses a Fabry-Perot geometry and dynamically adjusts the frequency of the illuminating laser to follow a single fringe. The reference length for the system is provided by a second laser whose wavelength is stabilized by a vibration-rotation absorption line in methane. The system shows excellent sensitivity, wide bandwidth, and essentially no drift. A sample of the earth-tide record obtained with the laser strainmeter and the initial motion observed for the nuclear explosion Boxcar are shown. The instrument should also be useful for observing free oscillations of the earth.
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