By Ulrich Wittrock
This ebook treats the improvement and alertness of adaptive optics for and drugs. The contributions describe lately built elements for adaptive-optics structures reminiscent of deformable mirrors, wavefront sensors, and reflect 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 in keeping with displays made on the 4th foreign Workshop on Adaptive Optics in and medication which happened in M?nster, Germany, in October 2003. This hugely profitable sequence of workshops on adaptive optics all started in 1997 and maintains with the fifth workshop in Beijing in 2005.
Read Online or Download Adaptive Optics for Industry and Medicine : Proceedings of the 4th International WorkshopMünster, Germany, Oct. 19-24, 2003 (Springer Proceedings in Physics) (Springer Proceedings in Physics) PDF
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Additional info for Adaptive Optics for Industry and Medicine : Proceedings of the 4th International WorkshopMünster, Germany, Oct. 19-24, 2003 (Springer Proceedings in Physics) (Springer Proceedings in Physics)
Of the objective lens and is in addition inversely proportional to the wavelength . A. lenses and short wavelengths. S is the sensitivity of the system and d denotes the cover layer thickness. )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.
Fig. 7. Normalised focus mode proﬁles 14 D. Rowe et al. 2. 4 New Concept Mirror The latest design concept considered exploits support ﬂexures located underneath the bimorph mirror, rather than at its edge. This increases the value of the lowest resonance, and the thickness of the mirror substrate can therefore be reduced. 5 mm for the 2nd iteration mirror, which has the same diameter. This, in conjunction with a simpliﬁed ﬂexure arrangement, should reduce the manufacturing cost of this option. Because of the reduction in weight, the new concept design could utilise compliant epoxy or rubber to hold the mirror in place.
In an optical pickup system there are two sources for spherical aberration: The ﬁrst one is the variation of the substrate thickness due to manufacturing tolerances under mass production conditions. The second one concerns disks with multiple data-layers, which cause spherical aberration when layers are switched, as the objective lens can only be optimized for a single layer thickness. We report a method for eﬀective compensation of spherical aberration by utilizing a novel liquid crystal device, which generates a parabolic wavefront proﬁle.
Adaptive Optics for Industry and Medicine : Proceedings of the 4th International WorkshopMünster, Germany, Oct. 19-24, 2003 (Springer Proceedings in Physics) (Springer Proceedings in Physics) by Ulrich Wittrock