ISSN:
1349-9432
Keywords:
optical disk
;
high numerical aperture
;
liquid crystal
;
compensation
;
wavefront aberration
;
multi-layer disk
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract To increase recording density in an optical disk system, a two-lens system which enlarge its numerical aperture (NA) has been developed. When NA becomes larger, however, the spherical aberration due to disk thickness error increases. We propose an optical pickup with a spherical aberration compensator using nematic liquid crystal (LC). Our LC device is composed of two LC cells each of which has X and Y stripe electrodes, respectively. We discussed how the spherical aberration due to the disk thickness error can be compensated by combination of two crossed cylindrical phase distributions induced by the LC cells, and confirmed the compensation effect in a design example by simulation. We have also fabricated the crossed stripe LC device actually, and have obtained the experimental result which shows that amount sufficient to compensate the aberration is achieved.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s10043-000-0138-2
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