Abstract
We propose and demonstrate an architecture that achieves passive coherent combination of two femtosecond fiber chirped-pulse amplifiers. The setup consists in the use of a well-balanced amplifying Sagnac interferometer. The experiment shows that the temporal, spectral, and spatial qualities of each beam are retained, with the generation of pulses at repetition rate, an uncompressed average power of , and a combining efficiency of 96%. The behavior of this architecture in the presence of high accumulated nonlinear phase is investigated.
© 2011 Optical Society of America
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