By G. Vdovin (auth.), Professor Dr. Ulrich Wittrock (eds.)
This ebook treats the improvement and alertness of adaptive optics for and drugs. The contributions describe lately built elements for adaptive-optics platforms akin to deformable mirrors, wavefront sensors, and reflect drivers in addition to whole adaptive optical platforms 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 according to shows made on the 4th foreign 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 begun in 1997 and keeps 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
3. The electrode design of the LC device using CLM technique Fig. 4. The eﬀective birefringence vs. voltage characteristic and a schematical driving method of the LC device is depicted. 4e shows a measured wavefront using a Shack–Hartmann sensor As already known the eﬀective birefringence is a nonlinear function of the applied voltage. For our planar oriented LC device the measured dependence is depicted in Fig. 4a. The eﬀective birefringence is maximal when there is no voltage applied to the cell.
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. R. W. ): Adaptive Optics for Industry and Medicine (Starline Printing 2002), pp. 145–153 5 Aberration Compensation Using Nematic Liquid Crystals S.
Due to quasi-linear behavior of the device in this mode, linear control algorithms can be implemented, which is already proved to work in experimental adaptive optical system . 2. Amplitude and phase control, which includes additional optimization of phase shifts between the voltages, can be used for further improvement of the results obtained by the 1st method. Simulations have shown that the reduction of residual aberrations due to optimization of phase shifts can reach 65%. However, this method requires using of nonlinear optimization algorithms.