Mathematics – Logic
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rsci...76f4501p&link_type=abstract
Review of Scientific Instruments, Volume 76, Issue 6, pp. 064501-064501-9 (2005).
Mathematics
Logic
11
Astrometric And Interferometric Instruments, Interferometry, Metrological Applications, Optical Frequency Synthesizers For Precision Spectroscopy, Modulation, Tuning, And Mode Locking, Resonators, Cavities, Amplifiers, Arrays, And Rings, Range Finders, Remote Sensing Devices, Laser Doppler Velocimeters, Sar, And Lidar, Interferometers, Measurement And Error Theory, Fiber Waveguides, Couplers, And Arrays, Sensors, Remote Sensing, Semiconductor Lasers, Laser Diodes, Design Of Specific Laser Systems
Scientific paper
Advanced astronomical missions with greatly enhanced resolution and physics missions of unprecedented accuracy will require laser distance gauges of substantially improved performance. We describe a laser gauge, based on Pound-Drever-Hall locking, in which the optical frequency is adjusted to maintain an interferometer's null condition. This technique has been demonstrated with pm performance. Automatic fringe hopping allows it to track arbitrary distance changes. The instrument is intrinsically free of the nm-scale cyclic bias present in traditional (heterodyne) high-precision laser gauges. The output is a radio frequency, readily measured to sufficient accuracy. The laser gauge has operated in a resonant cavity, which improves precision, can suppress the effects of misalignments, and makes possible precise automatic alignment. The measurement of absolute distance requires little or no additional hardware, and has also been demonstrated. The proof-of-concept version, based on a stabilized HeNe laser and operating on a 0.5 m path, has achieved 10 pm precision with 0.1 s integration time, and 0.1 mm absolute distance accuracy. This version has also followed substantial distance changes as fast as 16 mm/s. We show that, if the precision in optical frequency is a fixed fraction of the linewidth, both incremental and absolute distance precision are independent of the distance measured. We discuss systematic error sources, and present plans for a new version of the gauge based on semiconductor lasers and fiber-coupled components.
Phillips Dane J.
Reasenberg Robert D.
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