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Science News for April 12, 2009


Active optical clock

Researchers have proposed a novel optical clock concept that enables more stable clocks, sub-natural linewidth laser spectroscopy, and long coherence time lasers. The lasing behavior of the active optical clock is described by the modified Schawlow-Townes linewidth formula, which narrows the linewidth due to collective emission from ga...

SourceScience China Press·JournalChinese Science Bulletin·DateApr 12, 2009