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Multi-level diffrative phase profiles have the potential to significantly improve the performance of many conventional lens systems. The theory, design, and fabrication of these diffractive profiles are described in detail. Basic examples illustrate the potential usefulness, as well as the limitations, of these elements. Access!-n For .. J',L.,-" A.' t o 2tio rizi I r:rdoi:10.21236/ada213404 fatcat:sn24nds4nbhtxoqa6d6am5f3jm