Progress towards tomographic wavefront reconstruction using dynamically refocused Rayleigh laser beacons

Christoph J. Baranec, Michael Lloyd-Hart, N. Mark Milton, Thomas Stalcup, James A. Georges, Miguel Snyder, Nicole Putnam, J Roger P Angel

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

3 Citations (Scopus)

Abstract

Simultaneous wavefront measurements are planned at the 6.5 m MMT telescope of five dynamically refocused Rayleigh laser beacons (RLGS) and a bright natural star to demonstrate tomographic wavefront reconstruction. In this paper, we summarize preliminary data recorded from the five laser beacons during the first telescope run at the MMT in June 2004. Beam projection is from behind the secondary of the MMT to form a regular pentagon of beacons on the sky with a radius of 60 arcseconds around the natural star. Beacon images are recorded over a range gate from 20 to 30 km, with dynamic refocus optics in the focal plane to remove perspective elongation (Stalcup, et. al., these proceedings). Separate externally synchronized Shack-Hartmann sensors record wavefront measurements of the beacons and the star, which will yield the first 33 Zernike modes from each wavefront measurement. A linear tomographic reconstructor, implemented as a matrix multiplication of the combined Zernike modal amplitudes from all five RLGS, has been computed to estimate contributions to the atmospheric aberration in two layers at 0 and 6 km. To validate the tomographic approach, the wavefront of the natural star will be predicted by computing the sum of the aberration in the direction of the star, and the prediction compared to simultaneous measurements recorded from the star directly.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsD.B. Calia, B.L. Ellerbroek, R. Ragazzoni
Pages1129-1137
Number of pages9
Volume5490
EditionPART 3
DOIs
StatePublished - 2004
EventAdvancements in Adaptive Optics - Glasgow, United Kingdom
Duration: Jun 21 2004Jun 25 2004

Other

OtherAdvancements in Adaptive Optics
CountryUnited Kingdom
CityGlasgow
Period6/21/046/25/04

Fingerprint

beacons
Wavefronts
Stars
stars
Lasers
lasers
Aberrations
Telescopes
aberration
telescopes
multiplication
elongation
sky
Elongation
congressional reports
Optics
projection
optics
radii
sensors

Keywords

  • Adaptive optics
  • Multi-conjugate adaptive optics
  • Tomography
  • Wavefront sensors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Baranec, C. J., Lloyd-Hart, M., Milton, N. M., Stalcup, T., Georges, J. A., Snyder, M., ... Angel, J. R. P. (2004). Progress towards tomographic wavefront reconstruction using dynamically refocused Rayleigh laser beacons. In D. B. Calia, B. L. Ellerbroek, & R. Ragazzoni (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (PART 3 ed., Vol. 5490, pp. 1129-1137). [122] https://doi.org/10.1117/12.552297

Progress towards tomographic wavefront reconstruction using dynamically refocused Rayleigh laser beacons. / Baranec, Christoph J.; Lloyd-Hart, Michael; Milton, N. Mark; Stalcup, Thomas; Georges, James A.; Snyder, Miguel; Putnam, Nicole; Angel, J Roger P.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / D.B. Calia; B.L. Ellerbroek; R. Ragazzoni. Vol. 5490 PART 3. ed. 2004. p. 1129-1137 122.

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

Baranec, CJ, Lloyd-Hart, M, Milton, NM, Stalcup, T, Georges, JA, Snyder, M, Putnam, N & Angel, JRP 2004, Progress towards tomographic wavefront reconstruction using dynamically refocused Rayleigh laser beacons. in DB Calia, BL Ellerbroek & R Ragazzoni (eds), Proceedings of SPIE - The International Society for Optical Engineering. PART 3 edn, vol. 5490, 122, pp. 1129-1137, Advancements in Adaptive Optics, Glasgow, United Kingdom, 6/21/04. https://doi.org/10.1117/12.552297
Baranec CJ, Lloyd-Hart M, Milton NM, Stalcup T, Georges JA, Snyder M et al. Progress towards tomographic wavefront reconstruction using dynamically refocused Rayleigh laser beacons. In Calia DB, Ellerbroek BL, Ragazzoni R, editors, Proceedings of SPIE - The International Society for Optical Engineering. PART 3 ed. Vol. 5490. 2004. p. 1129-1137. 122 https://doi.org/10.1117/12.552297
Baranec, Christoph J. ; Lloyd-Hart, Michael ; Milton, N. Mark ; Stalcup, Thomas ; Georges, James A. ; Snyder, Miguel ; Putnam, Nicole ; Angel, J Roger P. / Progress towards tomographic wavefront reconstruction using dynamically refocused Rayleigh laser beacons. Proceedings of SPIE - The International Society for Optical Engineering. editor / D.B. Calia ; B.L. Ellerbroek ; R. Ragazzoni. Vol. 5490 PART 3. ed. 2004. pp. 1129-1137
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