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Compact active high-resolution imaging system

Buske, Ivo and Riede, Wolfgang (2008) Compact active high-resolution imaging system. In: Proceedings of SPIE Europe: Optics/Photonics in Security and Defence 2008. SPIE Europe: Optics/Photonics in Security and Defence 2008, 2008-09-15 - 2008-09-18, Cardiff, GB. (In Press)

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Abstract

High-resolution telescope systems used for observational tasks require sufficiently large apertures to enhance the spatial resolution. Due to the propagation through turbulent layers of the atmosphere the distorted wavefront implicates a broadening of the imaged spot and hence a loss in optical resolution. The improvement in visual resolution by applying adaptive optics has been successfully demonstrated in a mobile telescope platform. To compensate for the effects of atmospheric turbulence, a closed-loop system was developed with a bandwidth of up to 600 Hz capable to achieve a wavefront correction with a residual wavefront deformation of 50 nm RMS. A reference signal which is probing the wavefront distortion is realized with the help of a coherent laser beam emanating from the object. The developed adaptive optical system is capable of compensating phase distortions in a conjugated plane with time constants of 30 ms. Turbulence was artificially induced along the optical path by a turbulence generator. Measurements of MTF values and Strehl ratio will be presented.

Document Type:Conference or Workshop Item (Speech)
Title:Compact active high-resolution imaging system
Authors:
AuthorsInstitution or Email of Authors
Buske, IvoUNSPECIFIED
Riede, WolfgangUNSPECIFIED
Date:14 August 2008
Journal or Publication Title:Proceedings of SPIE Europe: Optics/Photonics in Security and Defence 2008
Refereed publication:Yes
In ISI Web of Science:No
Status:In Press
Keywords:adaptive optics, FSO, free space optical communication, atmospheric turbulence, high resolution imaging
Event Title:SPIE Europe: Optics/Photonics in Security and Defence 2008
Event Location:Cardiff, GB
Event Type:international Conference
Event Dates:2008-09-15 - 2008-09-18
Organizer:SPIE
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:10 Nov 2008
Last Modified:15 Jan 2010 00:23

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