Measurement of non-common path static aberrations in an interferometric camera by phase diversity

Zhaojun Yan; Thomas M. Herbst; Pengqian Yang; Peter Bizenberger; Xianyu Zhang; Albert R. Conrad; Thomas Bertram; Martin Kuerster; Hans-Walter Rix; Xinyang Li; Changhui Rao

doi:10.1117/12.974523

15 October 2012 Measurement of non-common path static aberrations in an interferometric camera by phase diversity

Zhaojun Yan, Thomas M. Herbst, Pengqian Yang, Peter Bizenberger, Xianyu Zhang, Albert R. Conrad, Thomas Bertram, Martin Kuerster, Hans-Walter Rix, Xinyang Li, Changhui Rao

Author Affiliations +

Proceedings Volume 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 841726 (2012) https://doi.org/10.1117/12.974523
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

LINC-NIRVANA (LN) is a near-infrared image-plane beam combiner with advanced, multi-conjugated adaptive optics for the Large Binocular Telescope. Non-common path aberrations (NCPAs) between the near-infrared science camera and the wave-front sensor (WFS) are unseen by the WFS and therefore are not corrected in closed loop. This would prevent LN from achieving its ultimate performance. We use a modified phase diversity technique to measure the internal optical static aberrations and hence the NCPAs. Phase diversity is a methodology for estimating wave-front aberrations by solving an unconstrained optimization problem from multiple images whose pupil phases differ from one another by a known amount. We conduct computer simulations of the reconstruction of aberrations of an optical system with the phase diversity method. In the reconstruction, we fit the wave-front to Zernike polynomials to reduce the number of variables. The limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) algorithm is very well suited to phase diversity (PD) due to its good performance in solving large scale optimization problems. The main constraint for the implementation of PD for LN is that we cannot add extra components to the internal interferometric camera imaging system to obtain infocus and defocus images. In this paper, we introduce a new method, namely shifting the focal plane source, not the detector, to overcome this constraint. Some experiments were done to test and verify this method and the results are presented and discussed. The study shows that the method is very flexible and the paper gives practical guidelines for the application of phase diversity methods to characterize adaptive optics systems.

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Zhaojun Yan, Thomas M. Herbst, Pengqian Yang, Peter Bizenberger, Xianyu Zhang, Albert R. Conrad, Thomas Bertram, Martin Kuerster, Hans-Walter Rix, Xinyang Li, and Changhui Rao "Measurement of non-common path static aberrations in an interferometric camera by phase diversity", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 841726 (15 October 2012); https://doi.org/10.1117/12.974523

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