HoloDisc
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| | More info. | March 17 2003, 4:36 PM |
Comparison testing of violet diodes:
http://home.ncifcrf.gov/ccr/flowcore/vioflame.htm
Package Power Technologies' unit can come in:
http://www.powertechnology.com/pdf/ham.pdf
While I was looking around I found these hi-powered laser diodes:
http://www.plttechnology.com/product.htm
Here's a little news blurp on Sanyo's Laser:
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Sanyo schedules production of 35mW blue-violet laser
Posted : 23 Jan 2003
Sanyo Electric Co. Ltd. will begin production this spring of a 35mW laser for next-generation writable optical disk systems. Sanyo plans to invest about $85 million to develop various blue-violet lasers and hopes to sell about $125 million of them in 2005.
"The introduction of the high-power 35mW laser will advance the next-g eneration DVD greatly," said Sanyo president Yukinori Kuwano. Sanyo will offer first samples of the 35mW part in May, priced at almost $1,700 apiece.
Sanyo's 35mW device is one of the highest-power blue-violet lasers announced to date. Last December, Ni chia Corp. and Sony Corp. said they would work together to develop a 100mW laser for use in upcoming Blu-ray disk systems.
Sanyo will build its blue-violet laser on a GaN substrate rather than a sapphire substrate, the substrate of choice for Nichia. Sanyo also employs an ion implantation layer that contributes to the precise control of the laser's emission, resulting in the kind of low-noise, low-current laser required for optical disk systems, Sanyo said.
Sanyo's part features a wavelength of 405nm, threshold current of 40mA, and operating current of 75mA. Since it does not have insulating sapphire substrate, it has instead a structure with electrodes on the top and bottom, which reduces chip size by about a half, Kuwano said.
The structure is dif ferent from Nichia's sapphire-based lasers, but Sanyo can make it without infringing any Nichia patents, Kuwano said.
Sanyo announced a 5mW blue-violet laser last March that uses the same structure, and is now sampling that part.
Anticipating higher d emand for blue-violet lasers, other manufacturers are also preparing for volume production. Aside from the Nichia/Sony partnership, Sharp Corp. will begin production of blue-violet lasers by the end of this year at a new fabrication facility, which is und er construction. And Rohm Co. Ltd. is developing a silicon carbide-based laser with Cree Inc.
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