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30 October 2001 Design, analysis, and fabrication of refractive beam shaping elements for optical storage applications
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Abstract
For the next generation of DVD we have designed an 'asymmetric Gaussian to flat-top' converter which uses two refractive optical elements. The design method is based on conservation of energy. This approach leads to an analytically solvable mapping equation which was integrated numerically. The properties of the designed element were analyzed by numerical nonparaxial wave-propagation as well as by experimental characterization. In detail, we have studied the tolerance to phase noise, the tolerance to deviations from the specified form and the tolerance to positioning errors. We observed, that the flat-top-intensity shows a very height sensitivity to phase noise. The sensitivity is increased by rotationally symmetric distributions of phase noise e.g. produced by diamond turning. The influence of these deviations on the intensity distribution in the focal plane of the high NA-focusing lens are investigated. First experimental results of a shaping element fabricated by direct write in resist are presented.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Karl-Heinz Brenner, Peter Kuemmel, and Uwe D. Zeitner "Design, analysis, and fabrication of refractive beam shaping elements for optical storage applications", Proc. SPIE 4443, Laser Beam Shaping II, (30 October 2001); https://doi.org/10.1117/12.446740
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