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Multi-conjugate adaptive optics with hybrid laser beacon systems

De La Rue, I. A. and Ellerbroek, B. L. (2002) Multi-conjugate adaptive optics with hybrid laser beacon systems. In: Adaptive Optics Systems and Technology II. Proceedings of SPIE. No.4494. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 290-301. ISBN 9780819442086. https://resolver.caltech.edu/CaltechAUTHORS:20190115-154057018

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Abstract

Results for a multi-conjugate adaptive optical (MCAO) system with multiple laser beacons at multiple altitudes are presented in this paper. The use of multi-conjugate deformable mirrors (DM's) increases the corrected field of view of an adaptive optical telescope system. This improves the imaging capability for extended astronomical objects such as planets, galaxies, and nebulae. Multiple laser beacons, as opposed to multiple natural guide stars, are needed to achieve a useful degree of sky coverage. The use of laser beacons at multiple altitudes in a hybrid laser beacon configuration has been shown in previous papers to reduce both focus and tilt anisoplanatism. In this study we combine all three of these aspects. The hybrid beacon scenarios used in this study consists of multiple high altitude sodium beacons at 90 km and/or multiple low altitude Rayleigh beacons at 10 to 20 km. We present results for an 8-m class telescope for 2 and 3 different DM conjugate altitudes. For each of these MCAO configurations the following parameters are varied: number of Rayleigh beacons, number of Rayleigh beacon wavefront sensor (WFS) subapertures, Rayleigh beacon altitudes for the Rayleigh/sodium configuration, number of natural beacons for tip/tilt correction, and number of natural beacon WFS subapertures. When the WFS subaperture for the natural beacon is greater than 1 x 1 it contributes to the higher order correction in addition to being used for tip/tilt correction. Results are compared in terms of Strehl Ratio for the J, H, and K band.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.454803DOIArticle
Additional Information:© 2002 Society of Photo-optical Instrumentation Engineers (SPIE). This research was supported by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini Partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United States), the National Research Council (Canada), CONICYT (Chili), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).
Funders:
Funding AgencyGrant Number
Gemini ObservatoryUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Australian Research CouncilUNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)UNSPECIFIED
Subject Keywords:multi-conjugate adaptive optics, adaptive optics, multiple laser guide stars, laser guide stars, anisoplanatism
Series Name:Proceedings of SPIE
Issue or Number:4494
DOI:10.1117/12.454803
Record Number:CaltechAUTHORS:20190115-154057018
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190115-154057018
Official Citation:Imelda A. De La Rue, Brent L. Ellerbroek, "Multiconjugate adaptive optics with hybrid laser beacon systems," Proc. SPIE 4494, Adaptive Optics Systems and Technology II, (4 February 2002); doi: 10.1117/12.454803
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92298
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Jan 2019 00:16
Last Modified:16 Nov 2021 03:48

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