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Russo-German startup claims laser materials breakthrough

Posted: 03 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:university of michigan? semiconductor laser? nsc-nanosemiconductor?

Researchers at the University of Michigan have produced 1.3?m edge-emitting semiconductor lasers that have demonstrated temperature stability over the range 0 to 80C, according to NSC-Nanosemiconductor GmbH, which supplied wafers for processing.

"The temperature stability demonstrated by our quantum dot technology and our MBE manufacturing expertise eliminates the need for a thermoelectric cooler and complex feedback photodetector circuitry to keep the operating power constant over temperature, which translates into cost savings and manufacturing simplification for makers of optical transceivers," said Bernd Meyer, CEO of NSC-Nanosemiconductor, a developer of nanoepitaxial compound semiconductor wafers.

NSC-Nanosemiconductor, originally spun out of the Abram Ioffe Physical-Technical Institute uses "quantum dot" technology with gallium arsenide along with a patented defect reduction technology. The Michigan group under Pallab Bhattacharya processed NSC-Nanosemiconductor wafers into 400- x 3-micron ridge waveguide lasers, the company said.

"From being a mere curiosity, self-organized quantum dot lasers have now emerged as a formidable technology, thanks to the painstaking research conducted by a number of groups around the world," said Bhattacharya. "These devices have demonstrated ultra-low threshold current, high output power and efficiency, ultra-low chirp, linewidth enhancement factor less than unity and a large modulation bandwidth. Now, with the demonstration of temperature independent operation, quantum dot lasers truly behave like atomic lasers."

"It is very satisfying to see such practical realization of years of advanced research" added Zhores Alferov, the Nobel Prize-winning head of the Abram Ioffe Institute and honorary chairman of NSC-Nanosemiconductor's scientific board. "This is just the start of further breakthroughs with quantum-dot technology which will transform the field of semiconductor lasers."

- Peter Clarke

Silicon Strategies

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