Kimio TATSUNO

Central Research Laboratories, Hitachi, Ltd., 1-280, Higashi-Koigakubo, Kokubunji, Tokyo, Japan 185

(Received May 8, 1996; Accepted November 1, 1996)

Imaging characteristics for holographic objective lenses application to optical disk pick-ups was analyzed by a comparison between flat and spherical aplanatic hologram lenses with the aid of the third order aberration theory and ray tracing method. The aplanatic hologram lens image field was 0.5 deg for NA=0.5 with focal length f=5 mm under the Marechal criterion. The results indicates that the aplanatic hologram lenses are feasible for optical disk applications.

Key words : hologram lens, aplanatism, aberration, Marechal criterion, optical disk