Download e-book for kindle: Adaptive optics for industry and medicine: proceedings of by Ulrich Wittrock

By Ulrich Wittrock

ISBN-10: 3540239782

ISBN-13: 9783540239789

This e-book treats the improvement and alertness of adaptive optics for and medication. The contributions describe lately constructed parts for adaptive-optics platforms similar to deformable mirrors, wavefront sensors, and replicate drivers in addition to entire adaptive optical platforms and their functions in and medication. purposes diversity from laser-beam forming and adaptive aberration correction for high-power lasers to retinal imaging in ophthalmology. The contributions are according to shows made on the 4th overseas Workshop on Adaptive Optics in and drugs which happened in Münster, Germany, in October 2003. This hugely winning sequence of workshops on adaptive optics begun in 1997 and keeps with the fifth workshop in Beijing in 2005.

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Additional resources for Adaptive optics for industry and medicine: proceedings of the 4th international workshop, MuМ€nster, Germany, Oct. 19-24, 2003

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Acknowledgements Aspects of the work reported here have been carried as part of the Smart Optics Faraday Partnership entitled A Complete Toolkit for Adaptive Optics. The aim of the programme is to develop low cost solutions to promote the use of Adaptive Optics. The other collaborators are: Imperial College, Davin Optronics, and Optisense. References 1. M. Ellis: Low-Cost Bimorph Mirrors in Adaptive Optics. PhD Thesis, IPL 3 Deformable Mirrors with Thermal Actuators G. Vdovin1,2 and M. Loktev1 1 2 Delft University of Technology, EEMCS, Electronic Instrumentation Laboratory Mekelweg 4, 2628 CD Delft, The Netherlands OKO Technologies PO Box 581, 2600 AN Delft, The Netherlands Summary.

Fig. 2. 2 Electrode Design Our LC device consists of two glass plates whose inner surfaces are coated with indium tin oxide (ITO). One of the surfaces is coated homogeneously to provide a uniform potential distribution. The second surface is provided with an electrode structure. The cell gap is filled with nematic LCs which are aligned planar through a polyimide layer. Depending on the local electric field distribution the effective birefringence ∆neff , which is defined as the retardation caused by the LC molecules divided by the cell gap, changes because of the realignment of the LC molecules and therefore the local phase of the incident linear polarized light changes.

4 . In a BD-system spherical aberration occurs once because of mass-production limited waviness of the surfaces of the disks. A nominal waviness of ±2 µm on the surface requires an active correction [3, 4]. The second source for spherical aberration in a BD-system results from the optical path differences of the axial and periphery rays when switching between the data layers. The BD-type disk uses two data layers with cover layer thicknesses of typically 80 µm and 100 µm, respectively and by focusing through the first semi-transparent data layer onto the second fully reflective data layer light passes trough a spacing layer of around 20 µm consisting of polycarbonate.

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Adaptive optics for industry and medicine: proceedings of the 4th international workshop, MuМ€nster, Germany, Oct. 19-24, 2003 by Ulrich Wittrock

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