Optical heads based on coupled-cavity laser diode

Yoshitada Katagiri; Hiro Ukita

doi:10.1117/12.218710

8 September 1995 Optical heads based on coupled-cavity laser diode

Yoshitada Katagiri, Hiro Ukita

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.

Citation Download Citation

Yoshitada Katagiri and Hiro Ukita "Optical heads based on coupled-cavity laser diode", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); https://doi.org/10.1117/12.218710

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