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High repetition rate with broadband spectrum optical pulses generated directly from an Yb – doped fiber oscillator were realized. The output spectrum has a 10 – dB spectral width of 106 nm over 1100nm. The average power of the pulses is higher than 100 mW and the repetition rate was 169.43 MHz. To the best of our knowledge, this is the first time the mode – locked Yb – doped fiber laser with the optical spectrum broader than 100 nm, pumped by low pump power has been reported.
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