Experimental results of ground-layer and tomographic wavefront reconstruction from multiple laser guide stars
Posted on 2017-04-28 - 14:23
We describe results from the first multi-laser wavefront sensing system designed to support tomographic modes of adaptive optics (AO). The system, now operating at the 6.5 m MMT telescope in Arizona, creates five beacons by Rayleigh scattering of laser beams at 532 nm integrated over a range from 20 to 29 km by dynamic refocus of the telescope optics. The return light is analyzed by a Shack-Hartmann sensor that places all five beacons on a single detector, with electronic shuttering to implement the beacon range gate. A separate high-order Shack-Hartmann sensor records simultaneous measurements of wavefronts from a natural star. From open-loop measurements, we find the average beacon wavefront gives a good estimate of ground layer aberration. We present results of full tomographic wavefront analysis, enabled by supplementing the laser data with simultaneous fast image motion measurements from three stars in the field. We describe plans for an early demonstration at the MMT of closed-loop ground layer AO, and later tomographic AO.
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Lloyd-Hart, Michael; Baranec, Christoph; Mark Milton, N.; Snyder, Miguel; Stalcup, Thomas; Roger, J.; et al. (2006). Experimental results of ground-layer and tomographic wavefront reconstruction from multiple laser guide stars. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.3760016.v1
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AUTHORS (7)
ML
Michael Lloyd-Hart
CB
Christoph Baranec
NM
N. Mark Milton
MS
Miguel Snyder
TS
Thomas Stalcup
JR
J. Roger
PA
P. Angel
KEYWORDS
beacon wavefrontlaser guide starsimage motion measurements532 nmlaser beamstomographic wavefront reconstruction29 km6.5 m MMT telescopemulti-laser wavefrontbeacon range gatehigh-order Shack-Hartmann sensor recordsShack-Hartmann sensorclosed-loop ground layer AOopen-loop measurementsreturn lightground layer aberrationadaptive opticstomographic AOtomographic wavefront analysissupport tomographic modeslaser dataExperimental resultstelescope optics