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Optical Engineering

Evaluation and autoalignment method of the focusing unit for a near-field optical recording system
Author(s): Hyoung Kil Yoon; DaeGab Gweon; Jun Hee Lee; Jaehwa Jeong; Hyeong-ryeol Oh; Sang Tae Lee
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Paper Abstract

Evaluation results and an autoalignment method for an optical head of a near-field recoding (NFR) system are presented. The focusing unit is an optical head of a NFR system and is composed of a solid immersion lens (SIL) and an objective lens (OL). Generally, the size of the focusing unit is smaller than that of the conventional optical recording head. Hence there are difficulties in assembling the small focusing unit precisely and a novel method for an effective assembly is required. We compose an evaluation system with an interferometer and evaluate some focusing unit samples aligned and assembled manually and present the obtained results. We also propose a conceptual method of autoalignment to assemble the focusing unit well by a pattern recognition using a neural network. Using the conventional optical tool, Code V, a tolerance analysis of the assembly error between the SIL and the objective lens and an interference pattern analysis for the assembly error are executed. Then, through an analysis of the simulation results, the autoalignment methodology using a neural network approach is proposed.

Paper Details

Date Published: 1 October 2004
PDF: 11 pages
Opt. Eng. 43(10) doi: 10.1117/1.1788693
Published in: Optical Engineering Volume 43, Issue 10
Show Author Affiliations
Hyoung Kil Yoon, Korea Advanced Institute of Science and Technology (South Korea)
DaeGab Gweon, Korea Advanced Institute of Science and Technology (South Korea)
Jun Hee Lee, Korea Advanced Institute of Science and Technology (South Korea)
Jaehwa Jeong, Korea Advanced Institute of Science and Technology (South Korea)
Hyeong-ryeol Oh, Hanyang Univ. (South Korea)
Sang Tae Lee, Kwangwoon Univ. (South Korea)

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