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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 19 — Jul. 1, 2002
  • pp: 3781–3789

Interferometric Hartmann wave-front sensing for active optics at the 6.5-m conversion of the Multiple Mirror Telescope

Steven C. West  »View Author Affiliations


Applied Optics, Vol. 41, Issue 19, pp. 3781-3789 (2002)
http://dx.doi.org/10.1364/AO.41.003781


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Abstract

A little-used interferometric modification to the classical Hartmann optical test is being used for active optics corrections at the 6.5-m Multiple Mirror Telescope (MMT) Observatory. The technique produces compact interference spots whose positions depend on discrete wave-front phase-difference errors. A diffraction model illustrates the formation of interference spots. The limitations on wave-front sampling that are due to atmospheric seeing are estimated. Two data reduction matrix strategies are given. A single correction of collimation and primary mirror figure produces a nearly diffraction-limited telescope image. Wave-front polynomial coefficients ranging from several nanometers to several micrometers in amplitude are reliably detected.

© 2002 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1940) Diffraction and gratings : Diffraction
(050.5080) Diffraction and gratings : Phase shift
(120.1680) Instrumentation, measurement, and metrology : Collimation
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(350.1260) Other areas of optics : Astronomical optics

History
Original Manuscript: October 4, 2001
Revised Manuscript: February 14, 2002
Published: July 1, 2002

Citation
Steven C. West, "Interferometric Hartmann wave-front sensing for active optics at the 6.5-m conversion of the Multiple Mirror Telescope," Appl. Opt. 41, 3781-3789 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-19-3781


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