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We report on all-fiber coherent combining of 1.55 mum Er-doped single mode amplifiers achieved by means of active phase control that specifically employs the refractive index changes in Yb-doped fiber induced by 980 nm laser diode.
We report on an ytterbium-doped fiber CPA system delivering millijoule level pulse energy at repetition rates above 100 kHz corresponding to an average power of more than 100 W. The compressed pulses have a pulse duration of 800 fs. To our knowledge, this constitutes the highest pulse energy ever extracted from a fiber based femtosecond laser system and nearly two orders of magnitude higher repetition...
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