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Pieces Parts

by Dan Wiswell About thirty years ago I was doing some spring cleaning and decided to bring a few tables worth of items to a large flea market in south-central New Hampshire. I had an […]
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Photon momentum for metrology – PTB.de

The optical cavity consists of two ultra-high-reflectivity mirrors (reflectivity > 99.995 %) that are suspended from two electromagnetic force-compensation balances. The visible laser beam is reflected 21 times between the mirrors. Source: Photon momentum for […]