Spectral broadening in high-power Yb-doped fiber lasers employing narrow-linewidth multilongitudinal-mode oscillators

Huang, Zhihua; Liang, Xiaobao; Li, Chengyu; Lin, Hungyen; Li, Qi; Wang, Jianjun; Feng, Jing

doi:10.1364/ao.55.000297

Cited by 54 publications

(21 citation statements)

References 17 publications

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“…In commercial multi-kilowatt fiber laser, a 20/400 Yb-doped LMA fiber and the co-pumped scheme are commonly used [20]. Thus, the same configuration was adopted in the simulation model; the laser system used a master oscillator power amplifier (MOPA) layout and the main parameters are listed in Table 1.…”

Section: Simulation Model and Resultsmentioning

confidence: 99%

Impact of Stimulated Raman Scattering on the Transverse Mode Instability Threshold

Liu

et al. 2018

IEEE Photonics J.

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Quantum defect originating from the stimulated Raman scattering (SRS) effect is a heat source that induces refractive index grating and, thus, significantly decreases the threshold of transverse mode instability (TMI), which is the main limiting factor for the power scaling of high-power fiber lasers. A semi-analytical model that takes the TMI and SRS effects into account was developed, and the impact of the Raman content variation due to changes in the injected seed and fiber length on the TMI threshold was investigated. Experimental demonstrations of the impact of the SRS effect on the TMI threshold are presented. We proved that TMI affects the beam quality of the signal light rather than the Raman light. Taking these facts into account, the suppression of SRS could be an effective way to counter the TMI of fiber lasers.

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Section: Simulation Model and Resultsmentioning

confidence: 99%

Impact of Stimulated Raman Scattering on the Transverse Mode Instability Threshold

Liu

et al. 2018

IEEE Photonics J.

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“…The seed signal will suffer nonlinear propagation in amplifier stage. The nonlinear propagation of the optical field can be simulated by the nonlinear coupling amplitude equation [21,22]. For the seed with a series of longitudinal modes generated by phase modulation, coupling amplitude equation needs to consider a series of light waves.…”

Section: Numerical Modelmentioning

confidence: 99%

Spectral evolution and stimulated Brillouin scattering suppression in phase-modulated fiber amplifier

et al. 2018

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The model combining power balance equations, coupling amplitude equations and stimulated Brillouin scattering (SBS) equation is established to simulate the spectrum evolution and SBS threshold in the amplifier stage. Four typical phase modulation seeds are employed to calculate the SBS spectrum evolution in fiber amplifier. The spectrum evolution results show that the top-hat shaped spectrum seed is optimal to suppress the SBS effect and scale the SBS threshold. The SBS threshold is studied in co-pumped and counter-pumped amplifiers. Simulation results show that counter-pumped amplifier is capable of generating about 2.5 times more output than co-pumped amplifier. The results provide theoretical basis on the design and experiment of continuous wave high power narrow linewidth fiber laser.

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“…Currently, the master oscillator power amplifier (MOPA) configuration has become a widely used choice to realize high-power output [7][8][9][10] . However, with the increase of the output power, the main signal laser's spectra will be broadened drastically by nonlinear effects such as self-phase modulation (SPM) [11][12][13] and four-wave mixing (FWM) [11,14] , which significantly affect the stability and further power improvement of the laser.…”

Section: Introductionmentioning

confidence: 99%

Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system

Bian

Jiao

et al. 2021

High Pow Laser Sci Eng

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Suppressing nonlinear effects in high-power fiber lasers based on fiber gratings has become a hotspot. At present, research is mainly focused on suppressing stimulated Raman scattering in a high-power fiber laser. However, the suppression of spectral broadening, caused by self-phase modulation or four-wave mixing, is still a challenging attribute to the close distance between the broadened laser and signal laser. If using a traditional fiber grating with only one stopband to suppress the spectral broadening, the signal power will be stripped simultaneously. Confronting this challenge, we propose a novel method based on phase-shifted long-period fiber grating (PS-LPFG) to suppress spectral broadening in a high-power fiber master oscillator power amplifier (MOPA) laser system in this paper. A PS-LPFG is designed and fabricated on 10/130 passive fiber utilizing a point-by-point scanning technique. The resonant wavelength of the fabricated PS-LPFG is 1080 nm, the full width at half maximum of the passband is 5.48 nm, and stopband extinction exceeds 90%. To evaluate the performance of the PS-LPFG, the grating is inserted into the seed of a kilowatt-level continuous-wave MOPA system. Experiment results show that the 30 dB linewidth of the output spectrum is narrowed by approximately 37.97%, providing an effective and flexible way for optimizing the output linewidth of high-power fiber MOPA laser systems.

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Spectral broadening in high-power Yb-doped fiber lasers employing narrow-linewidth multilongitudinal-mode oscillators

Cited by 54 publications

References 17 publications

Impact of Stimulated Raman Scattering on the Transverse Mode Instability Threshold

Impact of Stimulated Raman Scattering on the Transverse Mode Instability Threshold

Spectral evolution and stimulated Brillouin scattering suppression in phase-modulated fiber amplifier

Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system

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