Direct read after write optical disk system

Details Direct read after write optical disk system Direct read after write optical disk system

G - Physics

11

B

352/32.2

G11B 7/12 (2006.01) G11B 7/125 (2006.01) G11B 11/105 (2006.01)

Patent

CA 1206612

-1- ABSTRACT An optical disk system having direct read after write capabilities in which the write beam and the read beam are generated by a pair of integrated injection diode lasers. The integration can be achieved by mounting two separate injection diode lasers side by side in a common package or providing two side by side injection diode lasers formed on a common semiconductor substrate. The two lasers would be located in the same focal plane relative to a recording material, with one of the lasers pulse modulated to provide a data modulated write beam and the other laser driven in the continuous wave (CW) regime to provide a read beam of constant intensity. The plane containing the focused beams would be oriented relative to the recording material so that the focused beams impinge upon adjacent portions of one data track of the recording material. Since the pair of lasers are closely spaced (1-1000 microns) a common optical path or train is used for both the write beam and the read beam.

428629

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