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Er3+ -doped fiber-lasers efficiently generate frequency-combs for optical frequency metrology. We have for the first time resolved the two main concerns against fiber lasers vs the well established Ti:Sa technology by increasing the repetition rate to 250 MHz and decreasing the carrier envelope offset phase noise well below 1 rad.
Er3+-doped fiber-lasers efficiently generate frequency-combs for optical frequency metrology. 3.5 nJ energy, 35 fs duration and 100 MHz repetition-rate laser pulses are used to obtain an octave spanning frequency-comb in the visible.
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