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Proceedings Paper

Far-field focus sensor using moving interference fringes generated by a one-dimension uniform-pitch grating inside a collinear hologram data disc
Author(s): Teruo Fujita; Ryusuke Ishisaka; Haruki Toyoshima
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Paper Abstract

This paper reports the theoretical analysis and experimental results of a far-field focus sensor. This system utilizes moving interference fringes at the far-field caused by the one-dimension uniform-pitch grating embedded inside a disc. The intensity of the moving fringes was sampled and processed by a digital signal processor and synchronization circuits including a phase lock loop. A well-shaped and low-offset focus error signal was observed all over the disc rotation, as well as, the focus serve operation being confirmed. Finally, how this sensor can be adopted to the collinear hologram data storage system is discussed.

Paper Details

Date Published: 14 September 2018
PDF: 8 pages
Proc. SPIE 10757, Optical Data Storage 2018: Industrial Optical Devices and Systems, 1075708 (14 September 2018); doi: 10.1117/12.2322068
Show Author Affiliations
Teruo Fujita, Fukui Univ. of Technology (Japan)
Ryusuke Ishisaka, Fukui Univ. of Technology (Japan)
Haruki Toyoshima, Fukui Univ. of Technology (Japan)

Published in SPIE Proceedings Vol. 10757:
Optical Data Storage 2018: Industrial Optical Devices and Systems
Ryuichi Katayama; Yuzuru Takashima, Editor(s)

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