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Fritz Riehle of PTB, the national-standards lab in Braunschweig, Germany, says that such superiority had already been demonstrated in a comparison of two ytterbium optical clocks at his lab. 1083 nm ytterbium doped fibre amplifier for optical pumping of helium, Elec. However, some thermally excited ytterbium ions expel an electron and therefore shrink just enough to compensate for the lattice expansion. |
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