SYNTHESIZED DIFFRACTION ELEMENTS FOR DATA READING FROM OPTICAL DISKS
G. I. Greisukh, S. A. Stepanov
Design of the structure of diffraction elements with reference to the focusing of semiconductor laser radiation is discussed' For optimal choice of parameters of the synthesized structure, a single diffraction lens is shown to be usable as a high-aperture objective, focusing the radiation of a single- or multiple-mode semiconductor laser into a diffractionally limited spot whose size allows reliable readout from optical disks.
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