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Proceedings Paper

Advanced technology of GaN based tunable violet laser with external cavity for holographic data storage
Author(s): Naoki Mori; Norihiro Dejima; Atsushi Higashiura; Masaki Omori; Yu Higuchi
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Paper Abstract

We successfully completed the development of a GaN based Tunable laser for Tapestry holographic data storage through collaborative research with InPhase Technologies in 2010. After the collaborative research, with the aim to achieve further advance development for commercial storage use, we have continued to improve the laser characteristics, especially coherence property and high optical output power are significant issues for holographic data storage. Longitudinal single mode lasing is one of most important property in hologram recording; therefore we addressed to optimize laser diode structure for external cavity laser. In parallel to that, we have reviewed not only a Laser diode structure but also laser drive processing, and have successfully developed a function. In the case of performing high visibility hologram recording, prior to exposing to medium, both the laser driving current and the wavelength are slightly adjusted to achieve single mode lasing. We call this function “Mode Stabilizer”. Mode Stabilizer can automatically execute the adjustments in combination with an internal mode sensor for visibility sensing. This function is advantageous in that erroneous page-recording can be avoided. Moreover, we achieved high optical output power of 100 mW increased from conventional 45 mW, by optimizing the device structure of GaN Laser diode. With this high optical output power, acceleration of recording bit rate becomes possible.

Paper Details

Date Published: 8 September 2016
PDF: 6 pages
Proc. SPIE 9959, Optical Data Storage 2016, 995908 (8 September 2016); doi: 10.1117/12.2235336
Show Author Affiliations
Naoki Mori, Nichia Corp. (Japan)
Norihiro Dejima, Nichia Corp. (Japan)
Atsushi Higashiura, Nichia Corp. (Japan)
Masaki Omori, Nichia Corp. (Japan)
Yu Higuchi, Nichia Corp. (Japan)

Published in SPIE Proceedings Vol. 9959:
Optical Data Storage 2016
Ryuichi Katayama; Thomas D. Milster, Editor(s)

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