M. Aiba, S. Kawakita, J. Sato, K. Kanno, T. Yamada
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We have developed an objective lens which can be used for different optical disk formats -Blu-ray Disc, DVD and CD. The compatible technique is based on the diffraction characteristics optimized by tuning refractive index dispersion. This optical configuration can provide suitable designs for optical pick-up system of high speed recording.