Integrated optical pickup system for axial dual focus

We propose an optical pickup that acquires data from both layers of a dual-layer digital versatile disk simultaneously. An adaptive optical element that uses liquid crystals creates two axial foci separated by a spacing of 55 mum, which is the distance between the two layers. The spacing between the...

Full description

Saved in:
Bibliographic Details
Published in:Applied optics (2004) 2001-02, Vol.40 (5), p.614-621
Main Authors: Stankovic, S, Dias, D, Hain, M, Bhattacharya, S, Glöckner, R, Karaboué, C, Benmohammadi, L, Guessous, F, Wang, L, Tschudi, T, Ferstl, M, Pawlowski, E, Steingrüber, R
Format: Article
Language:English
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We propose an optical pickup that acquires data from both layers of a dual-layer digital versatile disk simultaneously. An adaptive optical element that uses liquid crystals creates two axial foci separated by a spacing of 55 mum, which is the distance between the two layers. The spacing between the foci can be varied by the adaptive element. The separation of the reflected light into TE and TM polarized light, corresponding to each of the layers, is made by dielectric gratings that are characterized by high aspect ratios. Electron-beam lithography and reactive ion etching techniques were used to produce the submicrometer structures. All fabricated elements were assembled in a pickup system, whose properties were measured.
ISSN:1559-128X
DOI:10.1364/ao.40.000614