Sparse-aperture adaptive optics

Peter Tuthill; James Lloyd; Michael Ireland; Frantz Martinache; John Monnier; Henry Woodruff; Theo ten Brummelaar; Nils Turner; Charles Townes

doi:10.1117/12.672342

28 June 2006 Sparse-aperture adaptive optics

Peter Tuthill, James Lloyd, Michael Ireland, Frantz Martinache, John Monnier, Henry Woodruff, Theo ten Brummelaar, Nils Turner, Charles Townes

Author Affiliations +

Proceedings Volume 6272, Advances in Adaptive Optics II; 62723A (2006) https://doi.org/10.1117/12.672342
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

Aperture masking interferometry and Adaptive Optics (AO) are two of the competing technologies attempting to recover diffraction-limited performance from ground-based telescopes. However, there are good arguments that these techniques should be viewed as complementary, not competitive. Masking has been shown to deliver superior PSF calibration, rejection of atmospheric noise and robust recovery of phase information through the use of closure phases. However, this comes at the penalty of loss of flux at the mask, restricting the technique to bright targets. Adaptive optics, on the other hand, can reach a fainter class of objects but suffers from the difficulty of calibration of the PSF which can vary with observational parameters such as seeing, airmass and source brightness. Here we present results from a fusion of these two techniques: placing an aperture mask downstream of an AO system. The precision characterization of the PSF enabled by sparse-aperture interferometry can now be applied to deconvolution of AO images, recovering structure from the traditionally-difficult regime within the core of the AO-corrected transfer function. Results of this program from the Palomar and Keck adaptive optical systems are presented.

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Peter Tuthill, James Lloyd, Michael Ireland, Frantz Martinache, John Monnier, Henry Woodruff, Theo ten Brummelaar, Nils Turner, and Charles Townes "Sparse-aperture adaptive optics", Proc. SPIE 6272, Advances in Adaptive Optics II, 62723A (28 June 2006); https://doi.org/10.1117/12.672342

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