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Impact of laser launch location on the performance of laser tomography and multiconjugate adaptive optics for extremely large telescopes

Gilles, Luc and Wang, Lianqi and Ellerbroek, Brent L. (2010) Impact of laser launch location on the performance of laser tomography and multiconjugate adaptive optics for extremely large telescopes. Applied Optics, 49 (31). G114-G119. ISSN 0003-6935. http://resolver.caltech.edu/CaltechAUTHORS:20101123-100441567

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Abstract

Laser tomography and multiconjugate adaptive optics are under development for ground-based extremely large telescopes. Continuous wave sodium guide star lasers are planned for these systems, but their use raises some difficulties due to the extended nature of the beacons generated in the mesosphere and their spatiotemporal variability. We describe a performance analysis on the impact of laser launch telescope (LLT) location for the Thirty Meter Telescope (TMT) multiconjugate adaptive optics system. A semianalytical first-order noise propagation calculation is presented, supplemented by end-to-end Monte Carlo physical optics simulations. The principal conclusion of the study is that modestly superior performance is achieved with multiple LLT locations around the primary mirror, compared to a single central LLT behind the secondary mirror, but the largest value of any of these improvements is of the order of 20 nm rms for the expected wavefront sensor noise levels, suggesting that the final choice of geometry should depend primarily on the cost and complexity of implementation trade-off. This conclusion is also fully supported by the fact that, for the TMT 70 arcsec laser guide star (LGS) asterism, the fratricide effect reduces the performance of the central launch geometry by only a small amount. The reduction ranges from only a few nm rms at zenith to a few tens of nm at a 45° zenith angle in the worst case that the effect cannot be calibrated.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1364/AO.49.00G114DOIUNSPECIFIED
http://www.opticsinfobase.org/abstract.cfm?uri=ao-49-31-G114PublisherUNSPECIFIED
Additional Information:© 2010 Optical Society of America. Received 31 March 2010; accepted 21 July 2010; posted 9 August 2010 (Doc. ID 126302); published 1 September 2010. The authors gratefully acknowledge the support of the TMT partner institutions: The Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology, and the University of California. This work was supported, as well, by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada (NRC), the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA), and the U.S. National Science Foundation (NSF).
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
CaltechUNSPECIFIED
University of California UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for Innovation UNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of Canada (NRC)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada UNSPECIFIED
British Columbia Knowledge Development Fund UNSPECIFIED
Association of Universities for Research in Astronomy (AURA) UNSPECIFIED
NSFUNSPECIFIED
Classification Code:OCIS codes: 010.1080, 010.7350
Record Number:CaltechAUTHORS:20101123-100441567
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101123-100441567
Official Citation:Luc Gilles, Lianqi Wang, and Brent L. Ellerbroek, "Impact of laser launch location on the performance of laser tomography and multiconjugate adaptive optics for extremely large telescopes," Appl. Opt. 49, G114-G119 (2010) http://www.opticsinfobase.org/abstract.cfm?URI=ao-49-31-G114
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20978
Collection:CaltechAUTHORS
Deposited By: Benjamin Perez
Deposited On:23 Nov 2010 21:12
Last Modified:26 Dec 2012 12:40

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