title: Passive coherent combination of two ultrafast rod type fiber chirped pulse amplifiers.
abstract: Using passive coherent beam combining of two ultrafast fiber amplifiers, we demonstrate the generation of high temporal quality 300 fs and 650 μJ pulses corresponding to 60 W of average power at a repetition rate of 92 kHz. Furthermore, at 2 MHz of repetition rate record coherent combining average powers of 135 W before and 105 W after compression are measured. A combining efficiency higher than 90% is maintained over the whole range of output powers and repetition rates investigated demonstrating the efficiency and robustness of the passive combining technique. The measured pulse-to-pulse relative power fluctuation at high energy is 2%, indicating that the system is essentially immune to environmental phase noise. We believe the passive combining method to be an attractive approach for compact multi-GW peak power femtosecond fiber-based sources.
authors.affiliation: Amplitude Systemes, Cité de la Photonique, 33600 Pessac, France. yzaouter@amplitude-systemes.com
authors.forename: Y
authors.initials: Y
authors.lastname: Zaouter
authors.forename: L
authors.initials: L
authors.lastname: Daniault
authors.forename: M
authors.initials: M
authors.lastname: Hanna
authors.forename: D N
authors.initials: DN
authors.lastname: Papadopoulos
authors.forename: F
authors.initials: F
authors.lastname: Morin
authors.forename: C
authors.initials: C
authors.lastname: Hönninger
authors.forename: F
authors.initials: F
authors.lastname: Druon
authors.forename: E
authors.initials: E
authors.lastname: Mottay
authors.forename: P
authors.initials: P
authors.lastname: Georges