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Ytterbium-doped fiber amplifiers present great advantages, but are limited in terms of pulse energy by the small transverse dimensions of the amplifying medium. Coherent combining of fiber amplifiers is a scalable technique that allows the increase of the pulse energy, but is demonstrated so far mostly in CW regime. Here, we report on the coherent beam combining of two identical femtosecond Yb-doped fiber chirped pulse amplifiers, using active control of the phase between the amplifiers by use of an integrated electro-optics phase modulator.
© 2011 Optical Society of America
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