Experimental demonstration of transverse mode instability enhancement by a counter-pumped scheme in a 2  kW all-fiberized laser

Zebiao Li; Zhihua Huang; Xiaoyu Xiang; Xiaobao Liang; Honghuan Lin; Shanhui Xu; Zhongmin Yang; Jianjun Wang; Feng Jing

doi:10.1364/PRJ.5.000077

Photonics Research, Volume. 5, Issue 2, 77(2017)

Experimental demonstration of transverse mode instability enhancement by a counter-pumped scheme in a 2 kW all-fiberized laser

Zebiao Li^1,2, Zhihua Huang², Xiaoyu Xiang², Xiaobao Liang², Honghuan Lin², Shanhui Xu^1,3,4, Zhongmin Yang^1,3,4、*, Jianjun Wang², and Feng Jing²

Author Affiliations

¹State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China

²Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

³Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou 510640, China

⁴Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, China

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Figures & Tables(10)

Fig. 1. Experimental setup.

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Fig. 2. M2 factor variation of the co-pumped and counter-pumped schemes as a function of the output power.

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Fig. 3. Spectra of the co-pumped and counter-pumped schemes with output power of nearly 2 kW.

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Fig. 4. Coupling coefficients of the co-pumped and counter-pumped schemes along the 50/400 fiber. The reader can refer to Smith and Smith’s model for the fiber amplifier parameters [9].

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Fig. 5. Coupling coefficients of the co-pumped and counter-pumped schemes along the 20/400 fiber.

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Fig. 6. TMI threshold of the co-pumped amplifier as a function of initial HOM content.

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Fig. 7. Output power of the co-pumped amplifier as a function of seed power.

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Table 1. Parameters of Test Amplifier

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Table 1. Parameters of Test Amplifier

$d_{core}$	20 μm	$λ_{s}$	1064 nm
$n_{core}$	1.4575	$λ_{p}$	976 nm
${NA}_{core}$	0.065	$h_{q}$	$1000 W / (m^{2} K)$
${NA}_{clad}$	0.46	$τ$	901 μs
$N_{Y b}$	$6.52 \times 10^{25} m^{- 3}$	$η$	$1.2 \times 10^{- 5} K^{- 1}$
$σ_{a p}$	$1.77 \times 10^{- 24} m^{2}$	$κ$	1.38 W/(Km)
$σ_{e p}$	$1.71 \times 10^{- 24} m^{2}$	$ρ$	$1.55 \times 10^{6} J / ({Km}^{3})$
$σ_{a s}$	$6.40 \times 10^{- 27} m^{2}$	$P_{s}$	20 W
$σ_{e s}$	$3.98 \times 10^{- 25} m^{2}$	$R_{N}$	$10^{- 10} {Hz}^{- 1}$

Table 2. TMI Threshold Comparison I: with Identical Cladding Diameter
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Table 2. TMI Threshold Comparison I: with Identical Cladding Diameter
Fiber Length/m Co-Pump/W Counter-Pump/W Bi-Pump/W ER
20/400 15 1853 4716 3195 155%
30/400 8 1185 2356 1903 99%
50/400 5 658 1076 1091 64%

Table 3. TMI Threshold Comparison II: with Identical Core Diameter
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Table 3. TMI Threshold Comparison II: with Identical Core Diameter
Fiber Length/m Co-Pump/W Counter-Pump/W Bi-Pump/W ER
30/250 3 634 1018 1003 60%
30/400 8 1185 2356 1903 99%
30/600 15 1933 4927 3326 155%

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Zebiao Li, Zhihua Huang, Xiaoyu Xiang, Xiaobao Liang, Honghuan Lin, Shanhui Xu, Zhongmin Yang, Jianjun Wang, Feng Jing, "Experimental demonstration of transverse mode instability enhancement by a counter-pumped scheme in a 2 kW all-fiberized laser," Photonics Res. 5, 77 (2017)

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