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

Evolutionary timescales of AO-produced speckles at NIR wavelengths

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

Optical Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

13 Scopus citations

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.

Original language	English (US)
Title of host publication	Adaptive Optics Systems V
Editors	Enrico Marchetti, Jean-Pierre Veran, Laird M. Close
Publisher	SPIE
ISBN (Electronic)	9781510601970
DOIs	https://doi.org/10.1117/12.2231926
State	Published - 2016
Event	Adaptive Optics Systems V - Edinburgh, United Kingdom Duration: Jun 26 2016 → Jul 1 2016

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9909
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Adaptive Optics Systems V
Country/Territory	United Kingdom
City	Edinburgh
Period	6/26/16 → 7/1/16

Keywords

Extreme adaptive optics
High-contrast imaging
SAPHIRA
SCExAO
Speckles

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2231926

Cite this

Goebel, S. B., Guyon, O., Hall, D. N. B., Jovanovic, N., & Atkinson, D. E. (2016). Evolutionary timescales of AO-produced speckles at NIR wavelengths. In E. Marchetti, J.-P. Veran, & L. M. Close (Eds.), Adaptive Optics Systems V Article 990918 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9909). SPIE. https://doi.org/10.1117/12.2231926

Evolutionary timescales of AO-produced speckles at NIR wavelengths. / Goebel, Sean B.; Guyon, Olivier; Hall, Donald N.B. et al.
Adaptive Optics Systems V. ed. / Enrico Marchetti; Jean-Pierre Veran; Laird M. Close. SPIE, 2016. 990918 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9909).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Goebel, SB, Guyon, O, Hall, DNB, Jovanovic, N & Atkinson, DE 2016, Evolutionary timescales of AO-produced speckles at NIR wavelengths. in E Marchetti, J-P Veran & LM Close (eds), Adaptive Optics Systems V., 990918, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9909, SPIE, Adaptive Optics Systems V, Edinburgh, United Kingdom, 6/26/16. https://doi.org/10.1117/12.2231926

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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.",

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AU - Atkinson, Dani E.

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N2 - 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.

AB - 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.

KW - Extreme adaptive optics

KW - High-contrast imaging

KW - SAPHIRA

KW - SCExAO

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Evolutionary timescales of AO-produced speckles at NIR wavelengths

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Keywords

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