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NASA NTRS · 20210005383

The Palomar Testbed Interferometer

van Belle, G.·Mobley, D.·Lane, B.·Kulkarni, S.·Koresko, C.·Gubler, J.·Dumont, P.·Boden, A.·Yu, J.·Shao, M.·Pan, X.·Palmer, D.·Malbet, F.·Gursel, Y.·Hines, B.·Wallace, J.·Colavita, M.
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Abstract

The Palomar Testbed Interferometer (PTI) is a long-baseline infrared interferometer located at Palomar Observatory, California.

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van Belle, G., Mobley, D., Lane, B., Kulkarni, S., Koresko, C., Gubler, J., Dumont, P., Boden, A., Yu, J., Shao, M., Pan, X., Palmer, D., Malbet, F., Gursel, Y., Hines, B., Wallace, J., Colavita, M.. 1998-06-24. The Palomar Testbed Interferometer. https://ntrs.nasa.gov/citations/20210005383

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The first of a new generation of high actuator density AO systems developed for large telescopes, PALM-3000 is optimized for high-contrast exoplanet science but will support operation with natural guide stars as faint as V approx. 18. PALM-3000 began commissioning in June 2011 on the Palomar 200" telescope and has to date over 60 nights of observing. The AO system consists of two Xinetics deformable mirrors, one with 66 by 66 actuators and another with 21 by 21 actuators, a Shack-Hartman WFS with four pupil sampling modes (ranging from 64 to 8 samples across the pupil), and a full vector matrix multiply real-time system capable of running at 2KHz frame rates. We present the details of the completed system, and initial results. Operating at 2 kHz with 8.3cm pupil sampling on-sky, we have achieved a K-band Strehl ratio as high as 84% in approx.1.0 arcsecond visible seeing.

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