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Optical quality membrane mirror

Seitz, Stefan and Buske, Ivo and Börret , Rainer (2009) Optical quality membrane mirror. Master's, Hochschule Aalen.

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Abstract

This thesis describes the development of an optical quality membrane mirror with aberrations smaller than the correction limit of an adaptive optical mirror. The shape is generated by a pressure difference. A small overview about historical and state-of-the-art membrane mirrors is given. Hencky’s respec-tively Campbell’s approximations are the most used theories for describing the deformation of a thin membrane subjected to uniform pressure. The main wavefront error is spherical aberration. Shape correction is possible by varying design-parameters or by using adaptive optical systems. Suitable materials are polyester and polyimide. A solar safety film is used for our membrane mirrors. Mechanical and optical properties were determined with experiments. Because the prototype DLR-AOS per-formed poorly, the influence of the initial tension was analyzed. The component creating this tension was replaced by a more satisfying pellicle frame adjustable in 5 axes. The point spread function im-proved significantly. A flexible experimental setup for measuring the deviation from a reference sphere with interference respectively Shack-Hartmann-sensor was designed. Integration of the adap-tive mirror is prepared. The wavefront deviation is within 10 λ (λ = 633 nm) and very smooth. 6 λ are achievable by adjusting the pellicle frame. The dominant wavefront errors are astigmatism and coma caused by non-ideal boundary conditions

Document Type:Thesis (Master's)
Title:Optical quality membrane mirror
Authors:
AuthorsInstitution or Email of Authors
Seitz, StefanUNSPECIFIED
Buske, IvoIvo.Buske@dlr.de
Börret , RainerUNSPECIFIED
Date:31 March 2009
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:membrane mirror, pellicle, aberrations
Institution:Hochschule Aalen
Department:Zentrum für Optische Technologien
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Dr.-Ing. Ivo Buske
Deposited On:07 Dec 2009 12:06
Last Modified:07 Dec 2009 12:06

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