title: Understanding multipeak phenomena in actively Q-switched fiber lasers.
abstract: Dynamics of split pulses in actively Q-switched fiber lasers are numerically investigated, and the mechanism that produces multipeak phenomena (MPP) is precisely illustrated. It is shown that the first transient pulse in a cavity is initiated by the quick switching of a Q-switching element, which actually injects part of the amplified spontaneous emission into the laser cavity in the form of a pulse. Then the multipeak structures are related to the evolution of the perturbation caused by the switching and are determined by the rise time of the switching and by conditions of photon density and population inversion.
authors.affiliation: Department of Engineering Physics, McMaster University, Hamilton, Ontario LBS 4L7, Canada. wangyong_x@yahoo.com
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Xu