Experimental and theoretical study on mode selection of fiber lasers with convex output end

LI Chen; LIAO Su-ying; ZHOU Jie; YAN Ping; GONG Ma-li

doi:10.3969/j.issn.1001-3806.2009.05.014

In order to improve the beam properties of fiber lasers,the fiber-end surface is processed similar to a convex spherical surface.The beam quality and the output power of the fiber lasers were studied experimentally.Based on the rate equation with transverse spatial hole burning taken into account,a theoretical model of mode selection with end face for the fiber lasers was set up and the effect was numerically simulated with the fiber convex output end.Numerical simulation and experimental results show that the output beam quality can be improved taking a convex face as the output end of a fiber laser.

Experimental and theoretical study on mode selection of fiber lasers with convex output end

Corresponding author: LIAO Su-ying, liaosuying@gmail.com;

1. State Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China

Received Date: 2008-11-08

Accepted Date: 2008-12-05

Available Online: 2009-10-25

Abstract: In order to improve the beam properties of fiber lasers,the fiber-end surface is processed similar to a convex spherical surface.The beam quality and the output power of the fiber lasers were studied experimentally.Based on the rate equation with transverse spatial hole burning taken into account,a theoretical model of mode selection with end face for the fiber lasers was set up and the effect was numerically simulated with the fiber convex output end.Numerical simulation and experimental results show that the output beam quality can be improved taking a convex face as the output end of a fiber laser.

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Reference (11)

[1]	JEONG Y,SAHU J K,PAYNE D N,et al.Ytterbium-doped large-core fiber laser with 1.36kW continuous-wave output power[J].Optics Express,2004,12(25):6088-6092.
[2]	BONATI G,VOELCKEL H,GABLER T,et al.1.53kW from a single Yb-doped photonic crystal fiber laser[C]//Late Breaking Developments.San Jose:Photonics West,2005:5709-2a.
[3]	FERMANN M E.Single-mode excitation of multimode fibers with ultra-short pulses[J].Opt Lett,1998,23(1):52-54.
[4]	KOPLOW J P,KLINER D A V,GOLDBERG L.Single-mode operation of a coiled multimode fiber amplifier[J].Opt Lett,2000,25(7):442-444.
[5]	ALVAREZ-CHAVEZ J A,GRUDININ A B,NILSSON J,et al.Mode selection in high power cladding pumped fiber lasers with tapered section[C]//Conference on Lasers and Electro-Optics CLEO'99.Washington,DC:The Optical Society of America,1999:247-248.
[6]	LIMPERT J,ZELLMER H,TNNERMANN A,et al.Suppression of high order modes in a multimode fiber amplifier using efficient gain-loss-management (GLM)[C]//Advanced Solid-State Lasers.Paper MB20.Washington,DC:The Optical Society of America,2002:112-114.
[7]	HOTOLEANU M,SODERLUND M,KLINER D,et al.High order mod-es suppression in large mode area active fibers by controlling the radial distribution of the rare earth dopant[J].Proc SPIE,2006,6102:61021T1-61021T8.
[8]	GRIEBNER U,KOCH R,SCHNNAGEL H,et al.Efficient laser operation with nearly diffraction-limited output from a diode-pumped heavily Nd-doped multimode fiber[J].Opt Lett,1996,21(4):266-268.
[9]	GRIEBNER U,SCHöNNAGEL H.Laser operation with nearly diffraction-limited output from a Yb:YAG multimode channel waveguide[J].Opt Lett,1999,24(11):750-752.
[10]	GONG M L,YUAN Y Y,LI C,et al.Numerical modeling of transverse mode competition in strongly pumped multimode fiber lasers and amplifiers[J].Optics Express,2007,15(6):3236-3246.
[11]	HIDEHIKO Y,PANEL P,MASUD M.Beam quality factor of higher order modes in a step-index fiber[J].Journal of Lightwave Technology,2006,24(3):1350-1355.

Experimental and theoretical study on mode selection of fiber lasers with convex output end

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