Blue-Violet Two-Beam Optical Head for High-Speed Recording

概要

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We proposed an optical head using two laser diodes, which can control each plane of polarization of the two beams from the laser diode individually. The optical head makes it possible to decrease crosstalk light markedly by spatially isolating two beams during playback. An optical disk apparatus employing the optical head was constructed and the two optical spots were aligned on an optical disk at an interval of approximately 10 μm. Writing and reading in parallel were performed using the two blue-violet beams. We obtained a crosstalk intensity of $-48$ dB against carrier intensity and demonstrated operation at a bit rate of 200 Mbps.
2004-11-15