Spherical Grating Objective Lenses for Optical Disk Pick-ups

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Abstract
Plane grating collimator lenses [GCLs] and spherical grating objective lenses [SGLs] have been developed and installed in different optical pick-ups for CD players. The relief profile for the grating lenses have been designed to obtain high diffraction power efficiency of about 80% for the GCLs and about 65% for the SGLs. The blazed grating profile has been engraved by diamond turning lathes. GCLs were mass-produced by the plastic injection molding method and installed in more than 80 thousand optical pick-ups for portable and general audio use. SGLs have a much higher NA and can be used as objectives for the optical pick-ups. A thin plastic relief grating profile for the SGLs is formed by the photo-polymerization method on a flat face of a piano-spherical glass substrate. The field angle for the SGLs is more than ±0.5 degree, within the Marechel Criterion.

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