8 September 1995 Optical heads based on coupled-cavity laser diode
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Proceedings Volume 2514, Optical Data Storage '95; (1995) https://doi.org/10.1117/12.218710
Event: Optical Data Storage '95, 1995, San Diego, CA, United States
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yoshitada Katagiri, Yoshitada Katagiri, Hiro Ukita, Hiro Ukita, } "Optical heads based on coupled-cavity laser diode", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); doi: 10.1117/12.218710; https://doi.org/10.1117/12.218710
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