Measurement of atmospheric turbulence with a Shack-Hartmann wavefront sensor at the new MMT's prime focus

Patrick C. McGuire, Maud P. Langlois, Michael Lloyd-Hart, Troy A. Rhoadarmer, J. Roger P Angel

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

1 Citation (Scopus)

Abstract

In order to prepare for the adaptive secondary program at the new 6.5 meter MMT, we have begun a campaign to measure atmospheric turbulence with a Shack-Hartmann wavefront sensor (WFS) camera. Our first efforts, prior to second aluminization of the primary, consisted of taking turbulence data with our WFS camera with special coma-correcting optics at the MMT prime focus, without a Cassegrain secondary mirror. Our first measurements consisted of 1000 frames of approximately 10 millisecond duration, taken approximately 3 seconds apart. We measure a 5/3 power law structure function, suggesting Kolmogorov turbulence, with an r0 = 15 cm, but with possible hints of an outer scale and tracking jitter in the structure function. At the end of our data acquisition, we deliberately put 2 μm of astigmatism into the primary mirror with its actuators, and in our analysis, we recover 1.7±0.3 μm of astigmatism. A brief analysis of the low-order modal amplitudes with the 3 second frame delay shows that there are significant self-correlations of the low-order modes even on this long time-scale.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Volume4007
StatePublished - 2000
EventAdaptive Optical Systems Technology - Munich, Ger
Duration: Mar 29 2000Mar 31 2000

Other

OtherAdaptive Optical Systems Technology
CityMunich, Ger
Period3/29/003/31/00

Fingerprint

Atmospheric turbulence
astigmatism
atmospheric turbulence
Wavefronts
Mirrors
Turbulence
Cameras
turbulence
cameras
mirrors
sensors
coma
Sensors
Jitter
data acquisition
Optics
Data acquisition
Actuators
actuators
optics

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

McGuire, P. C., Langlois, M. P., Lloyd-Hart, M., Rhoadarmer, T. A., & Angel, J. R. P. (2000). Measurement of atmospheric turbulence with a Shack-Hartmann wavefront sensor at the new MMT's prime focus. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4007). Society of Photo-Optical Instrumentation Engineers.

Measurement of atmospheric turbulence with a Shack-Hartmann wavefront sensor at the new MMT's prime focus. / McGuire, Patrick C.; Langlois, Maud P.; Lloyd-Hart, Michael; Rhoadarmer, Troy A.; Angel, J. Roger P.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4007 Society of Photo-Optical Instrumentation Engineers, 2000.

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

McGuire, PC, Langlois, MP, Lloyd-Hart, M, Rhoadarmer, TA & Angel, JRP 2000, Measurement of atmospheric turbulence with a Shack-Hartmann wavefront sensor at the new MMT's prime focus. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 4007, Society of Photo-Optical Instrumentation Engineers, Adaptive Optical Systems Technology, Munich, Ger, 3/29/00.
McGuire PC, Langlois MP, Lloyd-Hart M, Rhoadarmer TA, Angel JRP. Measurement of atmospheric turbulence with a Shack-Hartmann wavefront sensor at the new MMT's prime focus. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4007. Society of Photo-Optical Instrumentation Engineers. 2000
McGuire, Patrick C. ; Langlois, Maud P. ; Lloyd-Hart, Michael ; Rhoadarmer, Troy A. ; Angel, J. Roger P. / Measurement of atmospheric turbulence with a Shack-Hartmann wavefront sensor at the new MMT's prime focus. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4007 Society of Photo-Optical Instrumentation Engineers, 2000.
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