Picometer-accuracy, laser-metrology gauge for Keck interferometer differential-phase subsystem

Details Picometer-accuracy, laser-metrology gauge for Keck interferometer differential-phase subsystem Picometer-accuracy, laser-metrology gauge for Keck interferometer differential-phase subsystem

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4838..995g&link_type=abstract

Interferometry for Optical Astronomy II. Edited by Wesley A. Traub . Proceedings of the SPIE, Volume 4838, pp. 995-1010 (2003)

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Keck Interferometer differential-phase planet-detection system requires a picometer accuracy, large (2 μm to 4 μm) amplitude optical path-length modulator that can operate at fairly high frequencies (250 Hz, 750 Hz, and 1250 Hz, a partial, triangular wave motion). We have developed a gauge which monitors the amplitude of the motion of the path-length modulator and which is capable of reaching a sensitivity of at least 3 pm per sqrt(Hz) within a band width of 1 Hz at 250 Hz, 750 Hz, and 1250 Hz. Two of these gauges are built. The gauges are compared to each other while monitoring a common optical path-length modulator to determine their accuracy. In this paper, the gauge construction details, the results of the gauge accuracy tests as well as the final path-length modulator performance details are presented.

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