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A frequency comparison and an absolute frequency measurement of iodine stabilized frequency-doubled Nd:YAG lasers at 532 nm has been performed at the Max-Planck-Institute for Quantum Optics. Two independent I 2 -stabilized laser systems, one assembled at the Institute of Laser Physics, Novosibirsk, Russia, the other at the Physikalisch-Technische Bundesanstalt, Braunschweig, Germany were investigated...
We have measured the absolute frequency of the 115 In + 5s 21 S 0 -5s5p 3 P 0 clock transition at 236.5 nm with an accuracy of 3.3 parts in 10 11 . For this measurement, a frequency synthesis chain was used which links the indium clock transition to a methane-stabilized He-Ne laser at 3.39 μm and a Nd:YAG laser at 1064 nm...
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