http://arxiv.org/abs/1712.03526
We describe new results from the semiconductor-laser tracking frequency gauge, an instrument that can perform sub-picometer distance measurements and has applications in gravity research and in space-based astronomical instruments proposed for the study of light from extrasolar planets. Compared with previous results, we have improved incremental distance accuracy by a factor of two and absolute distance accuracy by a factor of 20. After an interruption of operation of a tracking frequency gauge used to control a distance, it is now possible, using a nonresonant measurement interferometer, to restore the distance to picometer accuracy by combining absolute and incremental distance measurements.
D. Kaplan, T. Roberts, J. Phillips, et. al.
Tue, 12 Dec 17
32/78
Comments: 7 pages, 4 figures. Submitted to JINST