Optical head using evanescent light and optical data recording/r

Details Optical head using evanescent light and optical data recording/r Optical head using evanescent light and optical data recording/r

1995-06-07

1998-03-31

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369112, 369126, G11B 709

Patent

active

057346321

ABSTRACT:
An optical information recording/reproducing method for recording and reproducing information using an evanescent light beam includes the steps of installing an optical head near an optical information recording medium, the optical head having a semiconductor laser, a photodetector for detecting a laser beam emitted from a first end surface of the semiconductor laser, and a device for generating evanescent light from the laser beam emitted from a second end surface of the semiconductor laser; injecting a current into the laser to produce a laser beam; generating an evanescent light by the laser beam in the evanescent light generating device; and interacting the evanescent light with the recording medium to record information on or reproduce information from the recording medium.

REFERENCES:
patent: 4860276 (1989-08-01), Ukita et al.
patent: 5159586 (1992-10-01), Yamashita et al.
patent: 5199090 (1993-03-01), Bell
patent: 5343460 (1994-08-01), Miyazaki et al.
patent: 5463609 (1995-10-01), Inagaki et al.
Journal of Applied Physics, vol. 63, No. 26, Dec. 27, 1993, "Fiber laser probe for near-field scanning optical microscopy", Betzig et al., pp. 3550-3552.
Patent Abstracts of Japan, vol. 17, No. 314, (P-1557), Jun. 15, 1993, & JP5-034129.

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