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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8670–8683

Active cophasing and aligning testbed with segmented mirrors

Weirui Zhao and Genrui Cao  »View Author Affiliations

Optics Express, Vol. 19, Issue 9, pp. 8670-8683 (2011)

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An active segmented cophasing imaging testbed with a high accurate optical adjustment and control in nanoscale is set up. A two-dimensional dispersed fringe analysis method is used to calculate the piston error between the adjacent segments. Segments alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the individual segment on the focal plane. The cophasing errors are corrected by sensitive micro-displacement actuators under a computer closed-loop control. A FISBA interferometer is introduced to evaluate that a final total residual surface error of about 0.08λ RMS and the residual piston error of 0.026λ RMS are achieved (λ = 633nm).

© 2011 OSA

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 7, 2011
Revised Manuscript: March 15, 2011
Manuscript Accepted: April 15, 2011
Published: April 19, 2011

Weirui Zhao and Genrui Cao, "Active cophasing and aligning testbed with segmented mirrors," Opt. Express 19, 8670-8683 (2011)

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