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July 7, 1993

HIGHER READ/WRITE BLUE LASER DENSITY FROM COHERENET

By CBR Staff Writer

IBM Corp, which licensed some of its blue laser technology to Coherenet Inc so that the company could make the devices for IBM and others, has been demonstrating a blue laser optical recording system that can read and write data at a density of 2.5G-bits per square inch, five times higher than current products using infra-red lasers, so that a typical double-sided 5.25 optical disk would hold 6.5Gb – the higher-frequency blue light can be focused to a smaller spot than can infra red light, so more data can be written in a given area – but the technology is a long way from being seen in disk drives.

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