Simultaneous measurements of sodium column density and laser guide star brightness

Jian Ge, Bruce P. Jacobsen, J Roger P Angel, Patrick C. McGuire, Tom Roberts, Brian A. McLeod, Michael Lloyd-Hart

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

25 Citations (Scopus)

Abstract

We report on new results of simultaneous measurements of sodium layer column density and the absolute return flux from laser guide stars created by a monochromatic approximately 1 W CW laser, tuned to the peak of the sodium D2 hyperfine structure. The return was measured at the MMT while the sodium abundance was measured at the CFA 60 inch telescope, about 1 km away, with the Advanced Fiber Optic Echelle spectrograph. The laser frequency stability, which can greatly affect the return flux, was monitored at the same time in order to improve the measurement accuracy. After the correction for laser frequency jitter and atmospheric transmission, the absolute flux return above the atmosphere for circularly polarized light is 1.2 X 106 photons s -1 m-2 per watt launched above the atmosphere, per unit column density, which we taken as our measured mean over the year of N(Na) equals 3.7 X 109 cm-2 at Tucson. The solidification of a final well-determined relationship between the sodium laser guide star brightness and sodium layer column density is pivotal in the design of the next generation laser guide star adaptive optics systems. We also report the measurements and analysis of the relationship between the projected beam waist of the sodium laser and the resultant spot size on the sodium layer under typical atmospheric conditions. Since wavefront measured error is proportional to spot size, and also to 1/(root) power, minimum spot size is crucial for lowest laser power requirement. By projecting the laser through diffraction limited optics of 0.5 m diameter, roughly 3 r0, we have achieved the smallest artificial beacon yet recorded, about 0.8 arcsec.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages242-253
Number of pages12
Volume3353
DOIs
StatePublished - 1998
EventAdaptive Optical System Technologies - Kona, HI, United States
Duration: Mar 23 1998Mar 23 1998

Other

OtherAdaptive Optical System Technologies
CountryUnited States
CityKona, HI
Period3/23/983/23/98

Fingerprint

Laser Guide Star
laser guide stars
Brightness
Sodium
Stars
Luminance
brightness
sodium
Laser
Lasers
lasers
Fluxes
Atmosphere
laser stability
Echelle
atmospheres
beacons
frequency stability
Spectrograph
Jitter

Keywords

  • Adaptive optics
  • Laser guide star
  • Point spread function
  • Sodium layer abundance

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ge, J., Jacobsen, B. P., Angel, J. R. P., McGuire, P. C., Roberts, T., McLeod, B. A., & Lloyd-Hart, M. (1998). Simultaneous measurements of sodium column density and laser guide star brightness. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3353, pp. 242-253) https://doi.org/10.1117/12.321678

Simultaneous measurements of sodium column density and laser guide star brightness. / Ge, Jian; Jacobsen, Bruce P.; Angel, J Roger P; McGuire, Patrick C.; Roberts, Tom; McLeod, Brian A.; Lloyd-Hart, Michael.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3353 1998. p. 242-253.

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

Ge, J, Jacobsen, BP, Angel, JRP, McGuire, PC, Roberts, T, McLeod, BA & Lloyd-Hart, M 1998, Simultaneous measurements of sodium column density and laser guide star brightness. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3353, pp. 242-253, Adaptive Optical System Technologies, Kona, HI, United States, 3/23/98. https://doi.org/10.1117/12.321678
Ge J, Jacobsen BP, Angel JRP, McGuire PC, Roberts T, McLeod BA et al. Simultaneous measurements of sodium column density and laser guide star brightness. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3353. 1998. p. 242-253 https://doi.org/10.1117/12.321678
Ge, Jian ; Jacobsen, Bruce P. ; Angel, J Roger P ; McGuire, Patrick C. ; Roberts, Tom ; McLeod, Brian A. ; Lloyd-Hart, Michael. / Simultaneous measurements of sodium column density and laser guide star brightness. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3353 1998. pp. 242-253
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