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PROBLEM TO BE SOLVED : To provide a fiber laser for generating a short pulse high repetition frequency fiber laser by employing a passive mode synchronized fiber laser, specifically employing a fiber integrated carbon nanotube saturable absorber. SOLUTION : The passive mode synchronized fiber laser employs a rare earth doped fiber interval as a gain medium that shows a relatively high absorption (for example, the peak pump absorption more than 50 dB/m), and a relatively low dispersion (for example, -20 ps/km-nm
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