Parameter space for the collective laser coupling in the laser fusion driver based on the concept of fiber amplification network.
Collective laser coupling of the fiber array in the inertial confinement fusion (ICF) laser driver based on the concept of fiber amplification network (FAN) is researched. The feasible parameter space is given for laser coupling of the fundamental, second and third harmonic waves by neglecting the influence of the frequency conversion on the beam quality under the assumption of beam quality factor conservation. Third harmonic laser coupling is preferred due to its lower output energy requirement from a single fiber amplifier. For coplanar fiber array, the energy requirement is around 0.4 J with an effective mode field diameter of around 500 μm while maintaining the fundamental mode operation which is more than one order of magnitude higher than what can be achieved with state-of-the-art technology. Novel waveguide structure needs to be developed to enlarge the fundamental mode size while mitigating the catastrophic self-focusing effect.
Reseach Center of Laser Fusion, China Academy of Engineering Physics, PO Box 919-988, Mianyang 621900, China.
Zhihua
Z
Huang
Honghuan
H
Lin
Dangpeng
D
Xu
Mingzhong
M
Li
Jianjun
J
Wang
Ying
Y
Deng
Rui
R
Zhang
Yongliang
Y
Zhang
Xiaocheng
X
Tian
Xiaofeng
X
Wei
D000669:Amplifiers, Electronic; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation