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We report on an all-polarization-maintaining mode-locked fiber with a nonlinear amplifying loop mirror. The repetition rate of the laser varying from 100 kHz to 21 MHz by adjusting the length of passive fiber at the proper position of the cavity. The pulse energy up to 0.1 mu J is realized in case of 100 kHz, and the compressed pulse duration of 177 fs is demonstrated in the case of 5.92 MHz. It's noticeable that almost all the pulses can be compressed to hundreds of femtosecond level.
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