Coherent beam combining and phase noise measurements of ytterbium fiber amplifiers.
Phase noise characterization of a 10-W Yb fiber amplifier is presented, and we demonstrate phase locking of two fiber amplifiers with near-perfect fringe contrast at power levels of as much as 10 W per fiber. Coherent beam combining is maintained during the turn-on transient as well as in thermal steady-state operation.
Massachusetts Institute of Technology Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA. saugst@ll.mit.edu
Steven J
SJ
Augst
T Y
TY
Fan
Antonio
A
Sanchez