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news digest ♦ Lasers


wrote, “decay abruptly” and release the stored charge as a giant pulse of coherent radiation.


“What’s unique about this is the delay time between when we create the population of electron-hole pairs and when the burst happens. Macroscopic coherence builds up spontaneously during this delay,” Noe said.


Kono said the basic phenomenon of superfluorescence has been seen for years in molecular and atomic gases but wasn’t sought in a solid-state material until recently. The researchers now feel such superfluorescence can be fine-tuned. “Eventually we want to observe the same phenomenon at room temperature, and at much lower magnetic fields, maybe even without a magnetic field,” he said.


Even better, Kono said, it may be possible to create superfluorescent pulses with any desired wavelength in solid-state materials, powered by electrical rather than light energy.


The researchers said they expect the paper to draw serious interest from their peers in a variety of disciplines, including condensed matter physics; quantum optics; atomic, molecular and optical physics; semiconductor optoelectronics; quantum information science; and materials science and engineering.


There’s much work to be done, Kono said. “There are several puzzles that we don’t understand,” he said. “One thing is a spectral shift over time: The wavelength of the burst is actually changing as a function of time when it comes out. It’s very weird, and that has never been seen.”


Noe also observed superfluorescent emission with several distinct peaks in the time domain, another mystery to be investigated.


Support for the research came from the National Science Foundation, with support for work at the National High Magnetic Field Laboratory from the state of Florida.


140 www.compoundsemiconductor.net January / February 2012


Further details of the researchers’ results can be seen in the paper, “ Giant superfluorescent bursts from a semiconductor magneto- plasma,” byG. Timothy Noe IIet al, Nature Physics, Published online on 29 January 2012. DOI: 10.1038/nphys2207


Thailand floods cause Oclaro revenues to slide 28%


The optical communications and laser innovator had revenues of $86.5 million for the second quarter of fiscal 2012, compared to revenues of $120.3 million for Q2 FY 2011


Oclaro has announced its financial results for its second quarter of fiscal year 2012, which ended December 31, 2011.


Revenues were $86.5 million for the second quarter of fiscal 2012, compared to revenues of $105.8 million in the first quarter of fiscal 2012.


“In the second quarter of fiscal 2012, Oclaro achieved revenue at the high end of our previous guidance range, primarily due to our recovery efforts from the recent Thailand flooding,” said Alain Couder, chairman and CEO of Oclaro.


“We are pleased with our recovery progress thus far. We expect full commercial production by the end of March for three of our five affected product lines and within the June quarter for the remaining two. In spite of the flood, we remain focused on enabling Oclaro to emerge from this period better positioned


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