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Laboratory demonstration of an alternative laser guide stars wavefront sensing technique—projected pupil plane pattern

Yang, Huizhe; Bharmal, Nazim; Myers, Richard; Younger, Eddy

Laboratory demonstration of an alternative laser guide stars wavefront sensing technique—projected pupil plane pattern Thumbnail


Authors

Huizhe Yang

Eddy Younger



Abstract

Adaptive optics (AO) is widely used in optical/near-infrared telescopes to remove the effects of atmospheric distortion, and laser guide stars (LGSs) are commonly used to ease the requirement for a bright, natural reference source close to the scientific target in an AO system. However, focus anisoplanatism renders single LGS AO useless for the next generation of extremely large telescopes. Here, we describe proof-of-concept experimental demonstrations of a LGS alternative configuration, which is free of focus anisoplanatism, with the corresponding wavefront sensing and reconstruction method, termed projected pupil plane pattern (PPPP). This laboratory experiment is a critical milestone between the simulation and on-sky experiment, for demonstrating the feasibility of PPPP technique and understanding technical details, such as extracting the signal and calibrating the system. Three major processes of PPPP are included in this laboratory experiment: the upward propagation, return path, and reconstruction process. From the experimental results, it has been confirmed that the PPPP signal is generated during the upward propagation and the return path is a reimaging process whose effect can be neglected (if the images of the backscattered patterns are binned to a certain size). Two calibration methods are used: the theoretical calibration is used for the wavefront measurement, and the measured calibration is used for closed-loop control. From both the wavefront measurement and closed-loop results, we show that PPPP achieves equivalent performance to a Shack–Hartmann wavefront sensor.

Citation

Yang, H., Bharmal, N., Myers, R., & Younger, E. (2019). Laboratory demonstration of an alternative laser guide stars wavefront sensing technique—projected pupil plane pattern. Journal of Astronomical Telescopes, Instruments, and Systems, 5(2), Article 029002. https://doi.org/10.1117/1.jatis.5.2.029002

Journal Article Type Article
Acceptance Date Apr 12, 2019
Online Publication Date May 7, 2019
Publication Date May 7, 2019
Deposit Date May 7, 2019
Publicly Available Date May 8, 2019
Journal Journal of Astronomical Telescopes, Instruments, and Systems
Electronic ISSN 2329-4221
Publisher Society of Photo-optical Instrumentation Engineers
Peer Reviewed Peer Reviewed
Volume 5
Issue 2
Article Number 029002
DOI https://doi.org/10.1117/1.jatis.5.2.029002
Public URL https://durham-repository.worktribe.com/output/1302191

Files

Published Journal Article (2.6 Mb)
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Copyright Statement
Huizhe Yang, Nazim Bharmal, Richard Myers, Eddy Younger, “Laboratory demonstration of an alternative
laser guide stars wavefront sensing technique—projected pupil plane pattern,” J. Astron. Telesc.
Instrum. Syst. 5(2), 029002 (2019), doi: 10.1117/1.JATIS.5.2.029002.






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