18 September 2007 Design and analysis of a diffractive astigmatic lens for DVD pickup
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Abstract
A refractive astigmatic lens is employed to generate a focus error signal (FES) for servo control in general optical pickup. In this paper, a diffractive optical element (DOE) is designed to implement optical functions of astigmatic focusing for a MEMS-based miniature optical pickup at 650nm wavelength. We present a diffractive astigmatic lens with its internal zones and external zones quantized into four, two phase levels, respectively based on fabrication consideration. The optical simulation based on scalar diffraction theory shows the efficiency of this quantized lens for astigmatic focusing and a comparison of the FES in the optical pickup system has been plotted.
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Wen-Jie Chen, Cheng-Huan Chen, "Design and analysis of a diffractive astigmatic lens for DVD pickup", Proc. SPIE 6667, Current Developments in Lens Design and Optical Engineering VIII, 666704 (18 September 2007); doi: 10.1117/12.735282; https://doi.org/10.1117/12.735282
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