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Chin. Opt. Lett.
 Home  List of Issues    Issue s2 , Vol. 12 , 2014    10.3788/COL201412.S21401


Beam cleanup of the stimulated Raman scattering in grade-index multi-mode fiber
Wenliang Wang, Liangjin Huang, Jinyong Leng, Shaofeng Guo, Zongfu Jiang
College of Optoelectric Science and Engineering, [National University of Defense Technology], Changsha 410073, China

Chin. Opt. Lett., 2014, 12(s2): pp.S21401

DOI:10.3788/COL201412.S21401
Topic:Lasers and laser optics
Keywords(OCIS Code): 060.2310  060.4370  190.5650  

Abstract
In order to study the beam cleanup effect of the stimulated Raman scattering (SRS) in the graded-index multi-mode fiber (GIMF), a continuous wave all-fiber laser at 1117.8 nm and a pulsed fiber amplifier at 1064 nm are built up as the seed and pump source in the Raman fiber amplifier (RFA). In unseeded SRS process, a pump beam with M.2x = 6.7 and M.2y = 6.7 is transferred into a Stokes beam with M.2x = 1.5 and M.2y = 1.7 in the multi-mode fiber with a 62.5 μm graded-index core (numerical aperture =0.29). In the RFA, a seed light with M.2x = 6.7 and M.2y = 7.3 is amplified to a signal light with M.2x = 1.8 and M.2y = 2.0. The experimental results are explained by the simulation on the mode evolution during SRS procession and Raman amplifica-tion in the GIMF. The results show that both the SRS and Raman amplification effect in the GIMF have beam cleanup effect.

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Received:2014/1/14
Accepted:2014/3/15
Posted online:2014/11/3

Get Citation: Wenliang Wang, Liangjin Huang, Jinyong Leng, Shaofeng Guo, Zongfu Jiang, "Beam cleanup of the stimulated Raman scattering in grade-index multi-mode fiber," Chin. Opt. Lett. 12(s2), S21401(2014)

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