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Proceedings Paper

Optical heads based on coupled-cavity laser diode
Author(s): Yoshitada Katagiri; Hiro Ukita
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Paper Abstract

Optical heads wherein a laser diode (LD) is optically coupled through a small aperture to a recording medium acting as an external mirror are described. A flying head and a fiber- coupled head are presented, and their high-sensitivity, wavelength-free detection characteristics are demonstrated. A micro-lens head is also investigated. Interference undulations of the coupled-cavity laser with various spatial frequencies due to variations in the external-cavity length are completely explained. Anti-reflection (AR) coatings on the LD facet with reflectivities of better than -40 dB greatly suppress these undulations. To achieve practical heads, fundamental fabrication techniques including AR coating and monolithic integration on laser wafers are briefly mentioned.

Paper Details

Date Published: 8 September 1995
PDF: 12 pages
Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); doi: 10.1117/12.218710
Show Author Affiliations
Yoshitada Katagiri, NTT Optical Network Systems Labs. (Japan)
Hiro Ukita, Ritsumeikan Univ. (Japan)

Published in SPIE Proceedings Vol. 2514:
Optical Data Storage '95
Gordon R. Knight; Hiroshi Ooki; Yuan-Sheng Tyan, Editor(s)

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