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redface
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redface,
User Rank: Light Beer
12/5/2012 | 1:07:07 AM
re: UCLA Claims First Silicon Laser
This seems to be an impressive achievement if it can be made practical.

I would like to know what is the lasing mechanism. How does the laser get its gain? Is it based on electrical pumping of power, or does it depend on optical pumping (in which case it probably would not be considered a true "silicon laser").
deauxfaux
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deauxfaux,
User Rank: Light Beer
12/5/2012 | 1:07:06 AM
re: UCLA Claims First Silicon Laser
It is a Raman laser.....the real question is

"Where is the pump"

The answer: It ain't Silicon yet
deauxfaux
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deauxfaux,
User Rank: Light Beer
12/5/2012 | 1:07:05 AM
re: UCLA Claims First Silicon Laser
Redface

I am going to check into the details to be 100% certain on this point, if anything different comes out of my investigation, I'll track you down on one of the boards and correct my post.
But I am 99% sure.

Yes....hypesmanship. Jalali was able to hype one other company into acquisition by Intel (Cognet, I think), so none of this seems surprising.

Deaux
redface
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redface,
User Rank: Light Beer
12/5/2012 | 1:07:05 AM
re: UCLA Claims First Silicon Laser
Deaufaux wrote:
"Where is the pump"
The answer: It ain't Silicon yet.

Thanks for the answer. So this is not really a "silicon laser". Rather, it is some kind of nonlinear optics done in silicon waveguides. It is really disturbing when people refuses to call a horse's ass a horse's ass...

I believe Intel is working on a similar device based on Raman amplification in silicon.

deauxfaux
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deauxfaux,
User Rank: Light Beer
12/5/2012 | 1:07:04 AM
re: UCLA Claims First Silicon Laser
Really cool stuff, but unfortunately, optically pumped and commercially irrelevant for the next 5-10 years

http://www.opticsexpress.org/v...
Frank
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Frank,
User Rank: Light Beer
12/5/2012 | 1:07:02 AM
re: UCLA Claims First Silicon Laser
Silicon optics switches by changing refractive index

By R. Colin Johnson
EE Times
October 27, 2004 (6:04 PM EDT)

PORTLAND, Ore. GÇö Silicon circuits traditionally don't do optics. As anc"indirect bandgap" material GÇö one in which the bottom of the conduction band is shifted with respect to the top of the valence band GÇö energy released during electron recombination with a hole is converted primarily into phonons instead of the photons. The result is a "direct bandgap" material like gallium arsenide.

Cornell University researchers have demonstrated nanoscale techniques they say enabled the world's first silicon chip that switches optical wavelengths. The key is a ring-shaped nanoscale cavity whose resonant frequency depends on its refractive index, which can be optically switched by virtue of a second light beam controlling free-carrier dispersion.

According to Cornell University engineer Michal Lipson, the technique should eventually enable terahertz switching of signals on silicon chips with ultra-low power, high-modulation depth picosecond optical switches. They can be fabricated alongside conventional silicon circuitry. "Our photonic circuits are for carrying information, not for logic," said Lipson, principle investigator and an assistant professor at Cornell in its electrical and computer engineering department.

The first application is likey to be all-optical routers rather than not photonic circuitry, which could come later. The National Science Foundation is funding Lipson's quest for techniques to enable silicon to handle optics applications.


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