Tomographic reconstruction of stellar wavefronts from multiple laser guide stars

Christoph Baranec, Michael Lloyd-Hart, N. Mark Milton, Thomas Stalcup, Miguel Snyder, Roger Angel

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

11 Citations (Scopus)

Abstract

Experiments have been carried out at the MMT telescope in June 2005 and again in April 2006 to validate open loop tomographic wavefront reconstruction using five dynamically refocused Rayleigh laser beacons (RLGS) and multiple tilt natural guide stars (NGS). Wavefront sensing in this manner is recognized as a critical precursor to the development of adaptive optics for Extremely Large Telescopes. At the MMT, wavefronts from the laser beacons are recorded by five 60-element Shack-Hartmann sensors implemented on a single CCD. A wide-field camera measures image motion from multiple field stars to calculate global tilt and distinguish effects of contributions to second order aberrations from low and high altitude turbulence. Together, the signals from these sensors are used to estimate the first 45 Zernike modes in the wavefront of a star within the LGS constellation. The reconstruction is compared off line to simultaneous wavefront measurements made of the star with a separate Shack-Hartmann sensor. We will present the results in this paper and quantify the wavefront improvement expected from tomographic adaptive optics correction.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6272 I
DOIs
StatePublished - 2006
EventAdvances in Adaptive Optics II - Orlando, FL, United States
Duration: May 24 2006May 31 2006

Other

OtherAdvances in Adaptive Optics II
CountryUnited States
CityOrlando, FL
Period5/24/065/31/06

Fingerprint

laser guide stars
Wavefronts
Stars
beacons
adaptive optics
stars
Lasers
sensors
telescopes
star distribution
Adaptive optics
constellations
low altitude
high altitude
Telescopes
lasers
aberration
charge coupled devices
Sensors
turbulence

Keywords

  • Adaptive optics
  • Laser guide stars
  • Multi-conjugate adaptive optics
  • Tomography
  • Wavefront sensors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Baranec, C., Lloyd-Hart, M., Milton, N. M., Stalcup, T., Snyder, M., & Angel, R. (2006). Tomographic reconstruction of stellar wavefronts from multiple laser guide stars. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6272 I). [627203] https://doi.org/10.1117/12.672529

Tomographic reconstruction of stellar wavefronts from multiple laser guide stars. / Baranec, Christoph; Lloyd-Hart, Michael; Milton, N. Mark; Stalcup, Thomas; Snyder, Miguel; Angel, Roger.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6272 I 2006. 627203.

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

Baranec, C, Lloyd-Hart, M, Milton, NM, Stalcup, T, Snyder, M & Angel, R 2006, Tomographic reconstruction of stellar wavefronts from multiple laser guide stars. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6272 I, 627203, Advances in Adaptive Optics II, Orlando, FL, United States, 5/24/06. https://doi.org/10.1117/12.672529
Baranec C, Lloyd-Hart M, Milton NM, Stalcup T, Snyder M, Angel R. Tomographic reconstruction of stellar wavefronts from multiple laser guide stars. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6272 I. 2006. 627203 https://doi.org/10.1117/12.672529
Baranec, Christoph ; Lloyd-Hart, Michael ; Milton, N. Mark ; Stalcup, Thomas ; Snyder, Miguel ; Angel, Roger. / Tomographic reconstruction of stellar wavefronts from multiple laser guide stars. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6272 I 2006.
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