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We demonstrate a DFB laser that can be injection locked to desire single mode of a femtosecond fiber laser comb. The femtosecond injection locking technique that can select one component among the fiber laser comb modes was applied to the comb selection. The DFB laser injection locked to the desired comb mode was used as optical frequency reference for absolute frequency measurement of an acetylene...
We report on an absolute frequency measurement of a single 40Ca+ ion in a linear Paul trap at the 10-15 level. A Cs-referenced frequency comb is used to measure the probe laser exciting the 4s2S1/2 to 3d2D5/2 quadrupole transition at 411 THz. A careful analysis of the estimated systematic shifts is given as well as an outlook on possible improvements.
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