We demonstrate coherent beam combining of two femtosecond fiber chirped-pulse amplifiers seeded by a common oscillator. Using a feedback loop based on an electro-optic phase modulator, an average power of $7.2\mathrm{W}$ before compression is obtained with a combining efficiency of 90%. The spatial and temporal qualities of the oscillator are retained, with a recombined pulse width of $325\mathrm{fs}$ . This experiment opens up a way to scale the peak/average power of ultrafast fiber sources.

© 2011 Optical Society of America

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