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Canuteson, EL, Zumberge MA.  1996.  Fiber-optic extrinsic Fabry-Perot vibration-isolated interferometer for use in absolute gravity meters. Applied Optics. 35:3500-3505.   10.1364/ao.35.003500   AbstractWebsite

In an absolute gravity meter, a laser interferometer measures the position of a test mass that is falling in a vacuum. The calculated value of gravity is the average acceleration of the mass during a set of drops, Since systematic accelerations of the optical system will bias the measured value of gravity, various interferometar geometries have been implemented in the past to isolate the optical system from ground motion. We have developed and tested a low-finesse fiber-optic extrinsic Fabry-Perot interferometer that is fixed to the mass of a critically damped seismometer in which the effects of systematic ground motion and acoustic vibrations are reduced. (C) 1996 Optical Society of America

Zumberge, MA.  1985.  Frequency Stability of a Zeeman-Stabilized Laser. Applied Optics. 24:1902-1904.   10.1364/AO.24.001902   AbstractWebsite

The frequency of a commercial hard-sealed He-Ne laser has been stabilized to the center of the discharge gain profile using the mode splitting caused by an axial magnetic field. The absolute frequency has been measured repeatedly during intermittent operation over 20 months. Its drift over most of this period has been 2.6 ± 0.7 MHz/yr. The lock point has been found to depend slightly on the laser tube’s temperature.