Getting Lucky With Adaptive Optics: Diffraction-limited-resolution In The Visible On a 5m-class Telescope

Physics – Optics

Scientific paper

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Scientific paper

We present the first results from a new instrument capable of diffraction-limited-resolution visible-light imaging on 5m-class telescopes. The new Palomar 200" LAMP instrument is an L3CCD-based Lucky Imaging backend camera to the PALMAO adaptive optics system. The camera records photon-counted images at 20-100 frames per second, covering up to 30 arcsec diameter fields. In postprocessing the highest quality frames, typically 10-20% of the dataset, are selected on the basis of Strehl ratio. The selected frames are drizzle-aligned to produce a final image with much improved resolution compared to standard AO long-exposure imaging. Over a six-night run the instrument typically produced images with 35-40 milli-arcsecond resolution and 5-20% Strehl ratios at 700nm.

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