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# Frequency Comb

Stack of quartz optical 'cavities' -- precisely machined disks of solid quartz crystal -- for use in NIST's compact laser frequency comb. (Only one is actually used.) A low-power infrared laser produces light that travels in a loop inside one of the cavities. Each cavity is 2 millimeters wide and shaped like a flat ellipse.

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February 19, 2008

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