Abstract
Systems for reading data from optical disks are suggested. In these systems a diffractive lens simultaneously executes the functions of a focusing objective and the dispersive element of dynamical autofocusing device. The design of diffractive lens structure is given for two cases. In the first case the objective focusing semiconductor laser emission consists of a single diffractive lens. In the second case, it consists of a diffractive and homogeneous lens with spherical surfaces. When designing the diffractive lens structure, one must consider that semiconductor lasers have a heat instability of emission frequency and emission wavelength spread from one sample to another.
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