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Proceedings Paper

Orthogonal linear polarized laser wave oscillation in a thin film integrated laser chip for MO disk signal detection
Author(s): Kenya Goto
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Paper Abstract

A laser diode chip coated with thin films on both edge- facets is proposed as a main functional device for a lensless magneto-optical (MO) reading head in a new magneto- optical floppy disk system. The head consists of the laser chip with anti-reflection coats, birefringence quarter wave films (QWF), a half mirror film (HM) and a Faraday rotator thin film, a polarizing film (as a combining device for two polarized waves) and a high speed photo diode chip. They are all die-bonded on one pair of heat sink metal which also works as electrodes supplying the injection current to the laser diode chip. An aero-flow suspender keeps the optical head very close toward the floppy disk recording surface. The laser cavity is formed between HM and MO disk. In this optical head the laser can oscillates two orthogonal linearly polarized laser waves in the inside of the chip but they are converted into two circular polarized waves in the outside of the chip through the two QWFs which are coated on the two edge-facets of the laser chip. The MO signal can be got from detecting a difference frequency between the two circular polarized waves which had been biased by the Kerr effect on the surface of the disk.

Paper Details

Date Published: 16 August 1996
PDF: 4 pages
Proc. SPIE 2873, International Symposium on Polarization Analysis and Applications to Device Technology, (16 August 1996); doi: 10.1117/12.246216
Show Author Affiliations
Kenya Goto, Tokai Univ. (Japan)

Published in SPIE Proceedings Vol. 2873:
International Symposium on Polarization Analysis and Applications to Device Technology
Toru Yoshizawa; Hideshi Yokota, Editor(s)

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