title: Active coherent beam combining of a five-element, 800 W nanosecond fiber amplifier array.
abstract: Coherent beam combining of an 800 W nanosecond single-frequency fiber amplifier array has been demonstrated. Five high-power all-fiberized Yb-fiber amplifiers were tiled into a crisscross array, and the laser beams were actively phase-locked by using the stochastic parallel gradient descent algorithm. The contrast of the far-field intensity pattern of the combined beam was more than 91.6%. The combined pulsed laser has a pulse width of ~3.5 ns and a peak power of 21.5 kW.
authors.affiliation: College of Optic-electric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
authors.forename: Rongtao
authors.initials: R
authors.lastname: Su
authors.forename: Pu
authors.initials: P
authors.lastname: Zhou
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.forename: Hanwei
authors.initials: H
authors.lastname: Zhang
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Xu