| Popis: |
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 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 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. |
