Photo-Polymer Objective Lens for Red Blue Lasers

The authors designed a photo-polymer objective lens which can be used for both red and blue lasers. The following two conditions were set to facilitate this lens production process. 1) We chose photo-polymer resin as one of the doublet lens materials. 2) One surface of the photo-polymer lens was designed to be flat. We installed this lens in pickup heads and played back some disks. Its performance was almost as good as that of a noncompatible glass lens.