Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star

Michael Lloyd-Hart, J Roger P Angel, Bruce P. Jacobsen, David M. Wittman, Donald W Mccarthy, Edward J. Kibblewhite, Barbara Carter, Walter J. Wild

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

A sodium guide star has been used to sense and correct atmospheric aberration during two runs at the Multiple Mirror Telescope (MMT). For the first run in 1993 May, the artificial star was created by a 0.5 W beam from a continuous- wave dye laser tuned to the D2 resonance line, projected from a telescope centered and coaxial with the main array of six 1.8 m mirrors. Scattering by the mesospheric sodium layer produced an artificial beacon equivalent in brightness to a natural star of visual magnitude 12.5, and of angular extent 1'.2 full width at half maximum (FWHM). During the second run in 1994 February, a 1.7 W dye laser was used to generate an artificial guide star of visual magnitude 10.4, and 1'.1 FWHM. In each case, the beacon was used by the MMT adaptive optics system to compensate in real time for atmospherically- induced differential image motion between the six mirror elements, at correction rates of up to 76 Hz. In the latter experiment, global wavefront tilt correction using a natural reference star was added, giving complete adaptive control. Simultaneously recorded images of a natural star coincident with the laser beacon show significantly reduced width and an increase in Strehl ratio of almost a factor of two.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsMark A. Ealey, Fritz Merkle
Pages364-372
Number of pages9
Volume2201
StatePublished - 1994
EventAdaptive Optics in Astronomy - Kailua, HI, USA
Duration: Mar 17 1994Mar 18 1994

Other

OtherAdaptive Optics in Astronomy
CityKailua, HI, USA
Period3/17/943/18/94

Fingerprint

Adaptive optics
adaptive optics
Stars
beacons
Sodium
sodium
stars
mirrors
Telescopes
telescopes
Mirrors
Dye lasers
dye lasers
Full width at half maximum
reference stars
adaptive control
continuous wave lasers
resonance lines
Continuous wave lasers
Wavefronts

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Lloyd-Hart, M., Angel, J. R. P., Jacobsen, B. P., Wittman, D. M., Mccarthy, D. W., Kibblewhite, E. J., ... Wild, W. J. (1994). Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star. In M. A. Ealey, & F. Merkle (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 2201, pp. 364-372)

Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star. / Lloyd-Hart, Michael; Angel, J Roger P; Jacobsen, Bruce P.; Wittman, David M.; Mccarthy, Donald W; Kibblewhite, Edward J.; Carter, Barbara; Wild, Walter J.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / Mark A. Ealey; Fritz Merkle. Vol. 2201 1994. p. 364-372.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lloyd-Hart, M, Angel, JRP, Jacobsen, BP, Wittman, DM, Mccarthy, DW, Kibblewhite, EJ, Carter, B & Wild, WJ 1994, Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star. in MA Ealey & F Merkle (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 2201, pp. 364-372, Adaptive Optics in Astronomy, Kailua, HI, USA, 3/17/94.
Lloyd-Hart M, Angel JRP, Jacobsen BP, Wittman DM, Mccarthy DW, Kibblewhite EJ et al. Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star. In Ealey MA, Merkle F, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 2201. 1994. p. 364-372
Lloyd-Hart, Michael ; Angel, J Roger P ; Jacobsen, Bruce P. ; Wittman, David M. ; Mccarthy, Donald W ; Kibblewhite, Edward J. ; Carter, Barbara ; Wild, Walter J. / Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star. Proceedings of SPIE - The International Society for Optical Engineering. editor / Mark A. Ealey ; Fritz Merkle. Vol. 2201 1994. pp. 364-372
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