Journal ArticleDOI
Optical Pickup with a Spherical Aberration Compensator Using a Crossed-Stripe Liquid Crystal Device
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TLDR
In this paper, an optical pickup with a spherical aberration compensator using nematic liquid crystal (LC) cells was proposed, which is composed of two LC cells each of which has X and Y stripe electrodes, respectively.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.read more
Citations
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Journal ArticleDOI
Liquid crystal lens for spherical aberration compensation in a Blu-ray disc system
TL;DR: Theoretical and experimental investigations into the use of a liquid crystal lens with a variable focal length for spherical aberration compensation in an optical pickup are presented in this paper, where the cover-layer thickness of the optical disc deviates from its nominal value.
Proceedings ArticleDOI
A study of blue-ray pickup head optical system with liquid crystal optics module
TL;DR: In this paper, a new optical design consisting of a blue-ray pick-up head system and liquid crystal optics is proposed, which is capable of correcting aberrations fast with liquid crystal optical scheme when any misalignment errors occur.
References
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Journal ArticleDOI
Solid immersion microscope
S. M. Mansfield,Gordon S. Kino +1 more
TL;DR: In this article, a real-time optical microscope was developed that operates on the same principle as a liquid immersion microscope, with the liquid replaced by a solid lens of high refractive index material.
Journal ArticleDOI
High-numerical-aperture lens system for optical storage
TL;DR: In this article, a glass element between the objective and the disk was added to increase the transverse resolution of optical storage systems by as much as a factor of 1.5.
Journal ArticleDOI
0.8-Numerical-Aperture Two-Element Objective Lens for the Optical Disk
Abstract: A high-numerical-aperture ( NA) optical pick-up for an optical disk was developed using a two-element lens, a thin disk substrate and a spherical aberration compensation mechanism. We designed a two-element objective lens rather than a conventional singlet objective lens in order to increase the fabrication tolerance of the objective lens for high NA. A disk substrate which is thinner than that of the digital video disk (DVD) was adopted to increase the disk tilt tolerance. A spherical aberration compensation mechanism was realized by controlling the distance between the two lenses of the objective using an actuator in order to cancel the aberration due to the variations in the disk thickness. In the experiment, we fabricated a two-element lens according to our design and confirmed that it performed as a high-quality 0.8- NA objective lens.
Proceedings ArticleDOI
High-density optical disk system using a solid immersion lens
TL;DR: In this paper, a truncated hemispherical solid immersion lens (SIL) attached to a conventional objective could multiply the effective numerical aperture of an optical pick-up by a factor of refractive index n.