Grating Angular Sensor for Astronomial Telescopes, LISA, and MGRS Applications

Details Grating Angular Sensor for Astronomial Telescopes, LISA, and MGRS Applications Grating Angular Sensor for Astronomial Telescopes, LISA, and MGRS Applications

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344909l&link_type=abstract

American Astronomical Society, AAS Meeting #213, #449.09; Bulletin of the American Astronomical Society, Vol. 41, p.341

Physics

Optics

Scientific paper

. Astrophysical telescope missions require highly precise angular pointing and steering. Conventional optical angular sensors rely on deflection by simple geometric reflection from the object. We propose and demonstrate a novel angular sensor using a diffractive grating. This method has higher sensitivity thanks to grating angle magnification and beam cross-section compression. The grating angular sensor is all-reflective, eliminating wavefront distortions that would be induced by transmissive optics. Here, we show the lastest results involving laser power scaling and low frequency detection. The best noise floor achieved at present was .2 nrad/Hz-1/2 with 14 mW of laser power. We also provide arguments for why there is still room for improvement.

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