Large binocular telescope interferometer adaptive optics: On-sky performance and lessons learned

Vanessa P. Bailey; Philip M. Hinz; Alfio T. Puglisi; Simone Esposito; Vidhya Vaitheeswaran; Andrew J. Skemer; Denis Defrère; Amali Vaz; Jarron M. Leisenring

doi:10.1117/12.2057138

Large binocular telescope interferometer adaptive optics: On-sky performance and lessons learned

Vanessa P. Bailey, Philip M. Hinz, Alfio T. Puglisi, Simone Esposito, Vidhya Vaitheeswaran, Andrew J. Skemer, Denis Defrère, Amali Vaz, Jarron M. Leisenring

Steward Observatory

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

41 Scopus citations

Abstract

The Large Binocular Telescope Interferometer is a high contrast imager and interferometer that sits at the combined bent Gregorian focus of the LBT's dual 8.4 m apertures. The interferometric science drivers dictate 0.1" resolution with 10³ - 10⁴ contrast at 10 μm, while the 4 μm imaging science drivers require even greater contrasts, but at scales <0.2". In imaging mode, LBTI's Adaptive Optics system is already delivering 4 μm contrast of 10⁴ - 10⁵ at 0.3" - 0.75" in good conditions. Even in poor seeing, it can deliver up to 90% Strehl Ratio at this wavelength. However, the performance could be further improved by mitigating Non-Common Path Aberrations. Any NCPA remedy must be feasible using only the current hardware: the science camera, the wavefront sensor, and the adaptive secondary mirror. In preliminary testing, we have implemented an "eye doctor" grid search approach for astigmatism and trefoil, achieving 5% improvement in Strehl Ratio at 4 μm, with future plans to test at shorter wavelengths and with more modes. We find evidence of NCPA variability on short timescales and discuss possible upgrades to ameliorate time-variable effects.

Original language	English (US)
Title of host publication	Adaptive Optics Systems IV
Editors	Jean-Pierre Veran, Enrico Marchetti, Laird M. Close
Publisher	SPIE
ISBN (Electronic)	9780819496164
DOIs	https://doi.org/10.1117/12.2057138
State	Published - 2014
Event	Adaptive Optics Systems IV - Montreal, Canada Duration: Jun 22 2014 → Jun 27 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9148
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Adaptive Optics Systems IV
Country/Territory	Canada
City	Montreal
Period	6/22/14 → 6/27/14

Keywords

Adaptive Optics
Infrared
Large Binocular Telescope
Non-Common Path Aberrations

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2057138

Cite this

Bailey, V. P., Hinz, P. M., Puglisi, A. T., Esposito, S., Vaitheeswaran, V., Skemer, A. J., Defrère, D., Vaz, A., & Leisenring, J. M. (2014). Large binocular telescope interferometer adaptive optics: On-sky performance and lessons learned. In J.-P. Veran, E. Marchetti, & L. M. Close (Eds.), Adaptive Optics Systems IV Article 914803 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9148). SPIE. https://doi.org/10.1117/12.2057138

Large binocular telescope interferometer adaptive optics: On-sky performance and lessons learned. / Bailey, Vanessa P.; Hinz, Philip M.; Puglisi, Alfio T. et al.
Adaptive Optics Systems IV. ed. / Jean-Pierre Veran; Enrico Marchetti; Laird M. Close. SPIE, 2014. 914803 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9148).

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

Bailey, VP, Hinz, PM, Puglisi, AT, Esposito, S, Vaitheeswaran, V, Skemer, AJ, Defrère, D, Vaz, A & Leisenring, JM 2014, Large binocular telescope interferometer adaptive optics: On-sky performance and lessons learned. in J-P Veran, E Marchetti & LM Close (eds), Adaptive Optics Systems IV., 914803, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9148, SPIE, Adaptive Optics Systems IV, Montreal, Canada, 6/22/14. https://doi.org/10.1117/12.2057138

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abstract = "The Large Binocular Telescope Interferometer is a high contrast imager and interferometer that sits at the combined bent Gregorian focus of the LBT's dual 8.4 m apertures. The interferometric science drivers dictate 0.1{"} resolution with 103 - 104 contrast at 10 μm, while the 4 μm imaging science drivers require even greater contrasts, but at scales <0.2{"}. In imaging mode, LBTI's Adaptive Optics system is already delivering 4 μm contrast of 104 - 105 at 0.3{"} - 0.75{"} in good conditions. Even in poor seeing, it can deliver up to 90% Strehl Ratio at this wavelength. However, the performance could be further improved by mitigating Non-Common Path Aberrations. Any NCPA remedy must be feasible using only the current hardware: the science camera, the wavefront sensor, and the adaptive secondary mirror. In preliminary testing, we have implemented an {"}eye doctor{"} grid search approach for astigmatism and trefoil, achieving 5% improvement in Strehl Ratio at 4 μm, with future plans to test at shorter wavelengths and with more modes. We find evidence of NCPA variability on short timescales and discuss possible upgrades to ameliorate time-variable effects.",

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AB - The Large Binocular Telescope Interferometer is a high contrast imager and interferometer that sits at the combined bent Gregorian focus of the LBT's dual 8.4 m apertures. The interferometric science drivers dictate 0.1" resolution with 103 - 104 contrast at 10 μm, while the 4 μm imaging science drivers require even greater contrasts, but at scales <0.2". In imaging mode, LBTI's Adaptive Optics system is already delivering 4 μm contrast of 104 - 105 at 0.3" - 0.75" in good conditions. Even in poor seeing, it can deliver up to 90% Strehl Ratio at this wavelength. However, the performance could be further improved by mitigating Non-Common Path Aberrations. Any NCPA remedy must be feasible using only the current hardware: the science camera, the wavefront sensor, and the adaptive secondary mirror. In preliminary testing, we have implemented an "eye doctor" grid search approach for astigmatism and trefoil, achieving 5% improvement in Strehl Ratio at 4 μm, with future plans to test at shorter wavelengths and with more modes. We find evidence of NCPA variability on short timescales and discuss possible upgrades to ameliorate time-variable effects.

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Large binocular telescope interferometer adaptive optics: On-sky performance and lessons learned

Abstract

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