Open AccessRaman fiber laser harmonically mode-locked by exploiting the intermodal beating of CW multimode pump source
Author(s) -
Zhengqian Luo,
C. C. Ye,
Hongyan Fu,
Haoliang Cheng,
J. Z. Wang,
Zhiping Cai
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.019905
Subject(s) - optics , fiber laser , materials science , laser , raman spectroscopy , harmonic , raman laser , multi mode optical fiber , nanosecond , mode locking , raman scattering , laser pumping , optoelectronics , optical fiber , physics , acoustics
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.