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First laboratory results with the LINC-NIRVANA high layer wavefront sensor.

Xianyu Zhang1, Wolfgang Gaessler, Albert R Conrad

  • 1Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany. zhang@mpia.de

Optics Express
|September 22, 2011
PubMed
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Multi-conjugate adaptive optics (MCAO) with the LINC-NIRVANA instrument demonstrates uniform wavefront correction across a wide field of view. Laboratory tests confirm the high layer wavefront sensor

Area of Science:

  • Astronomy
  • Optical Engineering
  • Adaptive Optics

Background:

  • Multi-conjugate adaptive optics (MCAO) enhances the corrected field of view and sky coverage.
  • LINC-NIRVANA utilizes layer-oriented MCAO (LO-MCAO) with multiple guide stars and pyramid wavefront sensors for high angular resolution.
  • The Large Binocular Telescope will employ LINC-NIRVANA for 10 milliarcsecond resolution observations.

Purpose of the Study:

  • To present initial laboratory results of the adaptive optics (AO) performance of the LINC-NIRVANA high layer wavefront sensor (HWS).
  • To evaluate the AO correction capabilities of the HWS across a wide field of view under simulated atmospheric turbulence.

Main Methods:

  • Simulated atmospheric turbulence using the Multi-Atmosphere Phase screen and Stars (MAPS) unit.

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  • Operated the high layer wavefront sensor (HWS) with a Xinetics-349 deformable mirror in a laboratory setting.
  • Calculated residual wavefront error and measured Full Width at Half Maximum (FWHM) of stars across a 2 arc-minute field of view.

    • Main Results:

    • Demonstrated the capability of the HWS to calculate approximate residual wavefront error for various turbulent layer altitudes and wind speeds.
    • Measured star FWHM across a nearly 2 arc-minute field of view using an undersampled CCD.
    • Achieved uniform AO correction across the simulated large field of view.

    Conclusions:

    • The high layer wavefront sensor (HWS) of LINC-NIRVANA is capable of achieving uniform adaptive optics correction over a large field of view.
    • Laboratory results validate the performance of the HWS for future astronomical observations.