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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709684.0, MPI für Astronomie / Publikationen_mpia
Optimization of the transmitted wavefront for the infrared adaptive optics system
Authors:Yang, P.; Hippler, S.; Zhu, J.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Science China Physics, Mechanics, and Astronomy
Issue / Number:4
Start Page:608
End Page:614
Audience:Not Specified
Abstract / Description:The adaptive optics system for the second-generation Very Large Telescope-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 1.4-2.4 mum band, while suppressing laser light originating from the GRAVITY metrology system requires custom-built optical componets. In this paper, we present the development of a quantitative near-infraredpoint 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 a theoretical analysis and experimental results. Our experimental results show that the phase error repeatability in the nanometer regime can be achieved.
Free Keywords:adaptive optics; non-common aberration; point diffraction interferometry
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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