title: Raman fiber laser harmonically mode-locked by exploiting the intermodal beating of CW multimode pump source.
abstract: We report here the first demonstration of a harmonic mode-locked Raman fiber laser using the intermodal beating of a continuous-wave (CW) multiple-longitudinal-mode pump laser. By matching the Raman-cavity round-trip frequency with the intermodal-beating one of a 1064 nm CW pump source, harmonic mode-locking in phosphosilicate Raman fiber laser is stably initiated at the first-order Stokes of 1239.5 nm, and generates rectangular-shape nanosecond pulses with the pulse energy up to 4.25 nJ. Using the new type of mode-locking, the harmonic order can be discretely tuned from 78 th- to 693 rd-order, and the cavity supermode is suppressed up to 51.1 dB with the signal-to-noise ratio of more than 65 dB.
authors.affiliation: Department of Electronic Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Luo
authors.forename: C C
authors.initials: CC
authors.lastname: Ye
authors.forename: H Y
authors.initials: HY
authors.lastname: Fu
authors.forename: H H
authors.initials: HH
authors.lastname: Cheng
authors.forename: J Z
authors.initials: JZ
authors.lastname: Wang
authors.forename: Z P
authors.initials: ZP
authors.lastname: Cai
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D053844:Lasers, Solid-State; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*