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We report supercontinuum generation by launching femtosecond Yb-fiber laser pulses into a tapered single-mode fiber of 3-μm core diameter. A spectrum of more than one octave, from 550 to 1,400 nm, has been obtained with an output power of 1.3 W at a repetition rate of 250 MHz, corresponding to a coupling efficiency of up to 60 %. Using a typical f-2f interferometer, the carrier envelope offset frequency...
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