Read e-book online Adaptive Optics for Industry and Medicine: Proceedings of PDF


By G. Vdovin (auth.), Professor Dr. Ulrich Wittrock (eds.)

This e-book treats the improvement and alertness of adaptive optics for and drugs. The contributions describe lately built elements for adaptive-optics platforms corresponding to deformable mirrors, wavefront sensors, and reflect drivers in addition to whole adaptive optical structures and their purposes in and drugs. purposes variety from laser-beam forming and adaptive aberration correction for high-power lasers to retinal imaging in ophthalmology. The contributions are in line with shows made on the 4th foreign Workshop on Adaptive Optics in and medication which happened in Münster, Germany, in October 2003. This hugely winning sequence of workshops on adaptive optics all started in 1997 and maintains with the 5th workshop in Beijing in 2005.

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Extra info for Adaptive Optics for Industry and Medicine: Proceedings of the 4th International Workshop Münster, Germany, Oct. 19–24, 2003

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The effect of the LC device in this mode of operation is similar to placing a variable telescope optic into the beam path. Our LC device consists of concentric ring electrodes to generate parabolic phase profiles to deform the wavefront that enters the objective lens. Simulations were made using the software ZEMAX to evaluate the extent of spherical aberration in a BD-system with dual data layers and to study the effect of compensation using the LC device. A. objective lens system which focuses perfectly on the 100 µm data layer, shows spherical aberration in the order of 550 mλ (RMS) when focusing on the 80 µm layer.

The tolerance limit for spherical aberration in a 5 Aberration Compensation Using Nematic Liquid Crystals 37 Fig. 1. Simulation set-up of a BD-type pickup and disk to calculate spherical aberration. The additional glass convex lens with a calculated focal length of 316 mm is necessary to generate the correct wavefront. By evaluation of the LC device in a BD test drive with 50 GB data capacity distributed on two layers, we achieved better results with a glass convex lens with f = 400 mm than with f = 300 mm BD-system is below 20 mλ (RMS).

M. Sarro: Electrical characteristics of plasma-enhanced chemical vapor deposited silicon carbide thin films. Materials Science Forum 433, 451 (2002) 9. M. W. De Lima Monteiro, G. Vdovin: Comparison study of the performance of piston, thin plate and membrane mirrors for correction of turbulence-induced phase distortions. Opt. Comm. 192, 91 (2001) 10. A. Hastings: The Art of Analog Layout (Prentice-Hall, Saddle Brook, NJ 2001) 11. M. Loktev, G. Vdovin, A. Naumov, C. Saunter, S. Kotova, I. Guralnik: Control of a modal liquid crystal wavefront corrector.

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