Evolutionary timescales of AO-produced speckles at NIR wavelengths

Sean B. Goebel, Olivier Guyon, Donald N. B. Hall, Nemanja Jovanovic, Dani E. Atkinson, Enrico Marchetti, Laird M. Close, Jean-Pierre Véran
2016 Adaptive Optics Systems V  
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
more » ... 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. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 01/18/2017 Terms of Use: http://spiedigitallibrary.org/ss/termsofuse.aspx Proc. of SPIE Vol. 9909 990918-6 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 01/18/2017 Terms of Use: http://spiedigitallibrary.org/ss/termsofuse.aspx Proc. of SPIE Vol. 9909 990918-7 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 01/18/2017 Terms of Use: http://spiedigitallibrary.org/ss/termsofuse.aspx
doi:10.1117/12.2231926 fatcat:ztm3gap4vvf4zc5zn3i32ah5sa