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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 9069–9080

Characterization of the transmitted near-infrared wavefront error for the GRAVITY/VLTI Coudé Infrared Adaptive Optics System

Pengqian Yang, Stefan Hippler, Casey P. Deen, Wolfgang Brandner, Yann Clénet, Thomas Henning, Armin Huber, Sarah Kendrew, Rainer Lenzen, Oliver Pfuhl, and Jianqiang Zhu  »View Author Affiliations


Optics Express, Vol. 21, Issue 7, pp. 9069-9080 (2013)
http://dx.doi.org/10.1364/OE.21.009069


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Abstract

The adaptive optics system for the second-generation VLT-interferometer (VLTI) instrument GRAVITY consists of a novel cryogenic near-infrared wavefront sensor to be installed at each of the four unit telescopes of the Very Large Telescope (VLT). Feeding the GRAVITY wavefront sensor with light in the 1.4 to 2.4 micrometer band, while suppressing laser light originating from the GRAVITY metrology system, custom-built optical components are required. In this paper, we present the development of a quantitative near-infrared point diffraction interferometric characterization technique, which allows measuring the transmitted wavefront error of the silicon entrance windows of the wavefront sensor cryostat. The technique can be readily applied to quantitative phase measurements in the near-infrared regime. Moreover, by employing a slightly off-axis optical setup, the proposed method can optimize the required spatial resolution and enable real time measurement capabilities. The feasibility of the proposed setup is demonstrated, followed by theoretical analysis and experimental results. Our experimental results show that the phase error repeatability in the nanometer regime can be achieved.

© 2013 OSA

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(050.1960) Diffraction and gratings : Diffraction theory
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(110.2650) Imaging systems : Fringe analysis

ToC Category:
Adaptive Optics

History
Original Manuscript: January 8, 2013
Revised Manuscript: March 3, 2013
Manuscript Accepted: March 4, 2013
Published: April 4, 2013

Citation
Pengqian Yang, Stefan Hippler, Casey P. Deen, Wolfgang Brandner, Yann Clénet, Thomas Henning, Armin Huber, Sarah Kendrew, Rainer Lenzen, Oliver Pfuhl, and Jianqiang Zhu, "Characterization of the transmitted near-infrared wavefront error for the GRAVITY/VLTI Coudé Infrared Adaptive Optics System," Opt. Express 21, 9069-9080 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-7-9069


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