Evolutionary timescales of AO-produced speckles at NIR wavelengths

Sean B. Goebel; Olivier Guyon; Donald N. B. Hall; Nemanja Jovanovic; Dani E. Atkinson

doi:10.1117/12.2231926

26 July 2016 Evolutionary timescales of AO-produced speckles at NIR wavelengths

Sean B. Goebel, Olivier Guyon, Donald N. B. Hall, Nemanja Jovanovic, Dani E. Atkinson

Proceedings Volume 9909, Adaptive Optics Systems V; 990918 (2016) https://doi.org/10.1117/12.2231926
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We present measurements of the evolutionary timescales of speckles around adaptive optics-corrected PSFs. We placed a SELEX SAPHIRA HgCdTe detector behind the SCExAO instrument at Subaru Telescope. We analyzed the behavior of speckles at radial distances of 2-8 λ/D away from the diffraction-limited PSF in H-band (∼1.6μm) images collected at ∼1 kHz framerates. Speckles evolve with a variety of timescales, and these have not previously been studied at near-infrared wavelengths. Ultimately we would like to image reflected-light exoplanets, which necessitates a fast speckle control loop. Based on our measurements, we calculate the parameters of an optimized control loop that would enable such observations.

Citation Download Citation

Sean B. Goebel, Olivier Guyon, Donald N. B. Hall, Nemanja Jovanovic, and Dani E. Atkinson "Evolutionary timescales of AO-produced speckles at NIR wavelengths", Proc. SPIE 9909, Adaptive Optics Systems V, 990918 (26 July 2016); https://doi.org/10.1117/12.2231926

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