Abstract

ABSTRACT Aperture masking interferometry and Adaptive Optics (AO) are two of the competing technologies attemptingto recover diraction-limited performance from ground-based telescopes. However, there are good argumentsthat these techniques should be viewed as complementar y, not competitive. Masking has been shown to deliversuperior PSF calibration, rejection of atmospheric noise and robust recoveryof phase information through the useofclosure phases. However, this comes at the penalty of lossof ”ux at the mask, restricting the technique to brighttargets. Adaptive optics, on the othe r hand, can reach a fainter class of objects but suers from the dicultyof calibration of the PSF which can vary with observational parameters such as seeing, airmass and sourcebrightness. Here we present results from a fusion of these two techniques: placing an aperture mask downstreamof an AO system. The precision characterization of the PSF enabled by sparse-aperture interferometry can nowbe applied to deconvolution of AO images, recovering structure from the traditionally-dicult regime within thecore of the AO-corrected transfer function. Results of this program from the Palomar and Keck adaptive opticalsystems are presented.Keywords: Optical Interferometry, Adaptive Optics

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