We have fabricated a high-numerical-aperture objective lens that consists of only a single-element. This lens has a large working distance and does not require assembly procedures in comparison to a two-element objective lens already proposed. We have also developed aberration-compensation methods for coma and spherical aberration. Spherical aberration is compensated automatically by using a servo circuit. A signal read-out obtained from a high-density optical disk is demonstrated using this single-element objective lens.
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Ariyoshi et al. (2002) studied this question.
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