A free fall interferometer to search for a possible fifth force

A free-fall interferometer has been developed to search for the suggested fifth force. With this interferometer, the acceleration difference between two objects which freely fall together with a sensitivity of a few mu Gals (1 Gal=0.01 m/s/sup 2/) can be measured. The design of the optical interferometer, the data analysis, and the performance of the system are discussed.<
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