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

Journals >Photonics Research >Volume 5 >Issue 2 >Page 77 > Article

Photonics Research
Vol. 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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DOI: 10.1364/PRJ.5.000077 Cite this Article Set citation alerts

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[J]. Photonics Research, 2017, 5(2): 77 Copy Citation Text

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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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$d_{core}$	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
$σ_{e s}$	$3.98 \times 10^{- 25} m^{2}$	$R_{N}$	$10^{- 10} {Hz}^{- 1}$