Atmospheric turbulence profiling with SLODAR using multiple adaptive optics wavefront sensors.

The slope detection and ranging (SLODAR) method recovers atmospheric turbulence profiles from time averaged spatial cross correlations of wavefront slopes measured by Shack-Hartmann wavefront sensors. The Palomar multiple guide star unit (MGSU) was set up to test tomographic multiple guide star adaptive optics and provided an ideal test bed for SLODAR turbulence altitude profiling. We present the data reduction methods and SLODAR results from MGSU observations made in 2006. Wind profiling is also performed using delayed wavefront cross correlations along with SLODAR analysis. The wind profiling analysis is shown to improve the height resolution of the SLODAR method and in addition gives the wind velocities of the turbulent layers.

[1]  Christopher D. Saunter,et al.  Horizontal turbulence measurements using SLODAR , 2005, SPIE Optics + Photonics.

[2]  Brian Wallace,et al.  Multiple-layer optical turbulence generator principle and SLODAR characterization: preliminary results , 2004, SPIE Remote Sensing.

[3]  S. Grossmann.  The Spectrum of Turbulence , 2003 .

[4]  P. Stetson.  DAOPHOT: A COMPUTER PROGRAM FOR CROWDED-FIELD STELLAR PHOTOMETRY , 1987 .

[5]  Victor Kornilov,et al.  MASS: a monitor of the vertical turbulence distribution , 2003, SPIE Astronomical Telescopes + Instrumentation.

[6]  William H. Press,et al.  Numerical Recipes: FORTRAN , 1988 .

[7]  William H. Press,et al.  Numerical Recipes in FORTRAN - The Art of Scientific Computing, 2nd Edition , 1987 .

[8]  Francois Rigaut,et al.  Scaling multiconjugate adaptive optics performance estimates to extremely large telescopes , 2000, Astronomical Telescopes and Instrumentation.

[9]  Andrei Tokovinin,et al.  Seeing Improvement with Ground‐Layer Adaptive Optics , 2004 .

[10]  Richard W. Wilson,et al.  SLODAR: measuring optical turbulence altitude with a Shack–Hartmann wavefront sensor , 2002 .

[11]  David L. Fried,et al.  Statistics of a Geometric Representation of Wavefront Distortion: Errata , 1965 .

[12]  D. L. Fried.  Errata: Statistics of a Geometric Representation of Wave-front Distortion. , 1966 .

[13]  Schock,et al.  Method for a quantitative investigation of the frozen flow hypothesis , 2000, Journal of the Optical Society of America. A, Optics, image science, and vision.

[14]  M. Troy,et al.  Multiple guide star tomography demonstration at Palomar Observatory , 2006, SPIE Astronomical Telescopes + Instrumentation.

[15]  Marc S. Sarazin,et al.  Development of a portable SLODAR turbulence profiler , 2004, SPIE Astronomical Telescopes + Instrumentation.

[16]  Richard W. Wilson,et al.  Determination of the profile of atmospheric optical turbulence strength from SLODAR data , 2006 .