Characterization of the Lick adaptive optics point spread function

Szymon Gladysz; Julian C. Christou; Michael Redfern

doi:10.1117/12.671605

27 June 2006 Characterization of the Lick adaptive optics point spread function

Szymon Gladysz, Julian C. Christou, Michael Redfern

Proceedings Volume 6272, Advances in Adaptive Optics II; 62720J (2006) https://doi.org/10.1117/12.671605
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

We have investigated both the temporal and spatial structure of the point spread function (PSF) produced by the Lick Observatory adaptive optics (AO) system using the FastSub readout mode of the IRCAL camera using short-exposure images with exposure times of 22ms at a frame rate of ~ 20Hz suitable for "freezing" the compensation under typical K-band observing conditions. These short exposures are a useful diagnostic tool for determining the system performance and permit measurement of the instantaneous Strehl ratio. Data taken from a number of observing runs, spanning over four months, show the underlying morphology of the PSF to be very stable with instantaneous Strehl ratios varying from ~ 20%-70% in NGS mode. Estimates of the instantaneous Strehl distribution have also been obtained from which we have determined the probability density function for the distribution of the instantaneous Strehl ratios.

Citation Download Citation

Szymon Gladysz, Julian C. Christou, and Michael Redfern "Characterization of the Lick adaptive optics point spread function", Proc. SPIE 6272, Advances in Adaptive Optics II, 62720J (27 June 2006); https://doi.org/10.1117/12.671605

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