Download PDF by G. Vdovin (auth.), Professor Dr. Ulrich Wittrock (eds.): Adaptive Optics for Industry and Medicine: Proceedings of

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

ISBN-10: 3540239782

ISBN-13: 9783540239789

ISBN-10: 3540288678

ISBN-13: 9783540288671

This publication treats the improvement and alertness of adaptive optics for and drugs. The contributions describe lately constructed parts for adaptive-optics structures comparable to deformable mirrors, wavefront sensors, and replicate drivers in addition to entire 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 keeping with displays made on the 4th overseas Workshop on Adaptive Optics in and medication which came about in Münster, Germany, in October 2003. This hugely profitable sequence of workshops on adaptive optics began in 1997 and maintains with the 5th workshop in Beijing in 2005.

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

Example text

We followed a simple procedure: Fig. 4. Testing set-up with Hartmann sensor 3 Deformable Mirrors with Thermal Actuators 21 Fig. 5. Hartmann test reconstruction of primary aberrations formed by the thermal deformable mirror – – – In the first step the mirror was planarized and the correspondent response of the Hartmann sensor was stored in the computer. In the second step this “target” response was modified to include the response, corresponding to the chosen aberration, and the feedback was closed to compensate for this modification.

Piezo-ceramic actuators with comparable elongation would be priced in the range of tens to hundreds of US dollars. Naturally, thermal actuators do not demonstrate any considerable hysteresis and can be driven by a very simple current sources. Low stiffness and slow response are the main disadvantages and the design of the deformable mirror should compensate for these disadvantages. 75 mm-thick glass wafer supported by 19 thermal actuators placed in a hexagonal grid with a pitch of 7 mm. To achieve thermal actuation, we used SFR 16S-220R resistors.

By reversing the applied voltages so that a higher potential difference exists in the center of the cell (Fig. 4d), a proper spherical index distribution arises. Nevertheless this configuration produces a concave lens. To compensate spherical aberration in a BD-system an inverse wavefront has to be generated. This was realized using an additional glass convex lens in combination with the LC device. 4 Implementation of the LC Device in a BD-System For a BD-system it is important to control the spherical aberration which occurs when switching between the layers.

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Adaptive Optics for Industry and Medicine: Proceedings of the 4th International Workshop Münster, Germany, Oct. 19–24, 2003 by G. Vdovin (auth.), Professor Dr. Ulrich Wittrock (eds.)


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