title: Intermodal interference induced significant frequency modulation to amplitude modulation conversion in a broadband large-mode-area fiber laser.
abstract: The conversion of the FM-to-AM effect induced by intermodal interference in the broadband large-mode-area (LMA) fiber laser was first investigated theoretically and experimentally. The numerical simulation results show that the spectrum transfer functions are different at different positions of the LMA fiber end face owing to the intermodal interference, so the output broadband pulses are different. We attain the similar results in the experiment when measuring the output pulse with the single mode fiber sampling oscilloscope. Whereas there is no amplitude modulation for the output pulse when measured by the bulk detector owing to the orthogonal characteristic of the eigenmodes.
authors.affiliation: Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Honghuan
authors.initials: H
authors.lastname: Lin
authors.forename: Feng
authors.initials: F
authors.lastname: Jing
authors.forename: Dangpeng
authors.initials: D
authors.lastname: Xu
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Huang
authors.forename: Ying
authors.initials: Y
authors.lastname: Deng
authors.forename: Yuanchao
authors.initials: Y
authors.lastname: Geng
authors.forename: Mingzhong
authors.initials: M
authors.lastname: Li
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Na
authors.initials: N
authors.lastname: Zhu
authors.forename: Jianjun
authors.initials: J
authors.lastname: Wang