scholarly journals Numerical modeling of the thermally induced core laser leakage in high power co-pumped ytterbium doped fiber amplifier

2018 ◽  
Vol 6 ◽  
Author(s):  
Lingchao Kong ◽  
Jinyong Leng ◽  
Pu Zhou ◽  
Zongfu Jiang
Keyword(s):  
Numerical Modeling ◽  
Physical Process ◽  
High Power ◽  
Fiber Amplifier ◽  
Theoretical Explanation ◽  
Combined Effect ◽  
Mode Instability ◽  
Thermally Induced ◽  
Bending Loss ◽  
Novel Model

We propose a novel model to explain the physical process of the thermally induced core laser leakage (TICLL) effect in a high power co-pumped ytterbium doped fiber (YDF) amplifier. This model considers the thermally induced mode bending loss decrease and the thermally induced mode instability (TMI) in the coiled YDF, and is further used to reproduce the TICLL effect in the high power co-pumped step-index $20/400$ fiber amplifier. Besides, the TICLL effect in the co-pumping scheme and counter-pumping scheme is compared. The result proves that the TICLL effect is caused by the combined effect of the thermally induced mode bending loss decrease and the TMI, and could be mitigated by adopting the counter-pumping scheme. To our best knowledge, this is the first theoretical explanation of the TICLL effect in high power fiber amplifier.

Theoretical study of the effect of pump wavelength drift on mode instability in a high-power fiber amplifier

Laser Physics ◽  
2018 ◽  
Vol 28 (4) ◽  
pp. 045101 ◽  
Author(s):  
Yakun Liu ◽  
Rumao Tao ◽  
Rongtao Su ◽  
Xiaolin Wang ◽  
Pengfei Ma ◽  
...  
Keyword(s):  
High Power ◽  
Theoretical Study ◽  
Fiber Amplifier ◽  
Pump Wavelength ◽  
Mode Instability

scholarly journals Study of dopant concentrations on thermally induced mode instability in high-power fiber amplifiers

Laser Physics ◽  
2016 ◽  
Vol 26 (6) ◽  
pp. 065103 ◽  
Author(s):  
Rumao Tao ◽  
Pengfei Ma ◽  
Xiaolin Wang ◽  
Pu Zhou ◽  
Zejin Liu
Keyword(s):  
High Power ◽  
Fiber Amplifiers ◽  
Mode Instability ◽  
Thermally Induced

Mode instability in high power all-fiber amplifier with large-mode-area gain fiber

2017 ◽  
Vol 396 ◽  
pp. 123-126 ◽  
Author(s):  
Jianming Wang ◽  
Dapeng Yan ◽  
Songsong Xiong ◽  
Bao Huang ◽  
Cheng Li
Keyword(s):  
High Power ◽  
Fiber Amplifier ◽  
Mode Instability ◽  
Large Mode Area ◽  
Mode Area

scholarly journals High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

2018 ◽  
Vol 6 ◽  
Author(s):  
Pengfei Ma ◽  
Hu Xiao ◽  
Daren Meng ◽  
Wei Liu ◽  
Rumao Tao ◽  
...  
Keyword(s):  
Output Power ◽  
High Power ◽  
Phase Modulation ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
Beam Quality ◽  
Mode Instability ◽  
Thermally Induced ◽  
Narrow Bandwidth ◽  
Maximal Output Power

An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA system for thermally induced mode instability (TMI) suppression. The stimulated Brillouin scattering (SBS) effect is balanced by simply using one-stage phase modulation technique. With different phase modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths accounting for 90% power of ${\sim}$0.025, 0.17 and ${\sim}$0.89 nm. Compared with our previous 976 nm pumping system, TMI threshold is overall boosted to be ${>}$5 times in which tandem pumping increases the TMI threshold of ${>}$3 times. The beam quality ($M^{2}$ factor) of the output laser is well within 1.5 below the TMI threshold while it is ultimately saturated to be 1.86 with the influence of TMI at maximal output power. Except for SBS and TMI, stimulated Raman scattering (SRS) effect will be another challenge for further power scaling. In such a high power MOPA system, multi-detrimental effects (SBS, SRS and TMI) will coexist and may be mutual-coupled, which could provide a well platform for further comprehensively investigating and optimizing the high power, narrow-bandwidth fiber amplifiers.

scholarly journals Build up and decay of mode instability in a high power fiber amplifier

2012 ◽  
Vol 20 (12) ◽  
pp. 13274 ◽  
Author(s):  
Nicoletta Haarlammert ◽  
Oliver de Vries ◽  
Andreas Liem ◽  
Andrea Kliner ◽  
Thomas Peschel ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Amplifier ◽  
Mode Instability

scholarly journals Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Qiuhui Chu ◽  
Rumao Tao ◽  
Chengyu Li ◽  
Honghuan Lin ◽  
Yuying Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Power ◽  
Fiber Amplifier ◽  
Mode Instability ◽  
Mode Excitation

Mode instability dynamics in high-power low-numerical-aperture step-index fiber amplifier

2017 ◽  
Vol 56 (19) ◽  
pp. 5412 ◽  
Author(s):  
Liangjin Huang ◽  
Tianfu Yao ◽  
Jinyong Leng ◽  
Shaofeng Guo ◽  
Rumao Tao ◽  
...  
Keyword(s):  
High Power ◽  
Numerical Aperture ◽  
Fiber Amplifier ◽  
Mode Instability ◽  
Step Index ◽  
Step Index Fiber
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