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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 23 — Aug. 10, 2006
  • pp: 5881–5896

Optical control of the Advanced Technology Solar Telescope

Robert Upton  »View Author Affiliations

Applied Optics, Vol. 45, Issue 23, pp. 5881-5896 (2006)

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The Advanced Technology Solar Telescope (ATST) is an off-axis Gregorian astronomical telescope design. The ATST is expected to be subject to thermal and gravitational effects that result in misalignments of its mirrors and warping of its primary mirror. These effects require active, closed-loop correction to maintain its as-designed diffraction-limited optical performance. The simulation and modeling of the ATST with a closed-loop correction strategy are presented. The correction strategy is derived from the linear mathematical properties of two Jacobian, or influence, matrices that map the ATST rigid-body (RB) misalignments and primary mirror figure errors to wavefront sensor (WFS) measurements. The two Jacobian matrices also quantify the sensitivities of the ATST to RB and primary mirror figure perturbations. The modeled active correction strategy results in a decrease of the rms wavefront error averaged over the field of view (FOV) from 500 to 19   nm , subject to 10   nm rms WFS noise. This result is obtained utilizing nine WFSs distributed in the FOV with a 300   nm rms astigmatism figure error on the primary mirror. Correction of the ATST RB perturbations is demonstrated for an optimum subset of three WFSs with corrections improving the ATST rms wavefront error from 340 to 17 .8   nm . In addition to the active correction of the ATST, an analytically robust sensitivity analysis that can be generally extended to a wider class of optical systems is presented.

© 2006 Optical Society of America

OCIS Codes
(220.1000) Optical design and fabrication : Aberration compensation
(220.1140) Optical design and fabrication : Alignment
(220.4830) Optical design and fabrication : Systems design
(350.1260) Other areas of optics : Astronomical optics
(350.4600) Other areas of optics : Optical engineering

Original Manuscript: January 4, 2006
Revised Manuscript: February 28, 2006
Manuscript Accepted: March 1, 2006

Robert Upton, "Optical control of the Advanced Technology Solar Telescope," Appl. Opt. 45, 5881-5896 (2006)

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