High-power coherent beam polarization combination of fiber lasers: progress and prospect [Invited]

Liu, Zejin; Ma, Pengfei; Su, Rongtao; Tao, Rumao; Ma, Yanxing; Wang, Xiaolin; Zhang, Pu

doi:10.1364/josab.34.0000a7

Cited by 110 publications

(48 citation statements)

References 76 publications

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“…High power linearly polarized all-fiber lasers or MOPAs with narrow linewidth and near diffraction limited beam quality have important applications for nonlinear frequency conversion [1], spectral beam combining (SBC) [2]- [5] and coherent beam combining (CBC) [6]- [8]. However, nonlinear effects (NLE) such as SBS [9], four-wave-mixing (FWM) [10], [11] and mode instability (MI) [12] effects have limited the power scaling of this type of narrow linewidth fiber laser systems.…”

Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced selfpulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M 2 maintains lower than 1.3 in the power scaling process.

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Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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“…The ultrashort pulses can be generated from the lasers by the principle of passive mode-locking technologies 4-7 .Generally, the passively mode-locked ultrafast solid-state lasers are considered to possess better performance than fiber lasers 8,9 . However, with the rapid developments of both the laser and optical fiber technologies, now the performance of modern ultrafast fiber lasers becomes to be comparable with the solid-state lasers [11][12][13] . Therefore, the ultrafast fiber lasers are regarded as the candidates of the next-generation ultrashort pulse sources because of their obvious advantages such as robust operation, flexible light path, and excellent heat dissipation.After achieving the passive mode-locking operation in fiber lasers, the ultrashort pulses can be treated as the optical solitons 14 .…”

mentioning

confidence: 99%

Soliton Booting Dynamics in an Ultrafast Anomalous Dispersion Fiber Laser

Chen

Yao

et al. 2018

IEEE Photonics J.

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Ultrafast fiber lasers play important roles in many aspects of our life for their various applications in fields ranging from fundamental sciences to industrial purposes. Passive mode-locking technique is a key step to realize the ultrafast soliton fiber lasers. However, the booting dynamics of the soliton fiber lasers have not yet been well understood. Herein, we reveal the soliton buildup dynamics of ultrafast fiber lasers operating both in anomalous and net-normal dispersion regimes. Based on the advanced experimental methodologies of spatio-temporal reconstruction and dispersive Fourier transform (DFT), the soliton booting dynamics are analyzed in the time and spectral domains. It was found that the booting dynamics of conventional and dissipative solitons operating in the anomalous and net-normal dispersion regimes, respectively, are different from each other due to the different pulse shaping mechanisms. In particular, the spectral interference pattern with strong relaxation oscillation behavior was observed near the mode-locking transition for conventional soliton, while no relaxation oscillation of spectral pattern was obtained for dissipative soliton. We firstly revealed that the spectral pattern distributions are induced by the transient structured soliton formation during the pulse shaping from the noise background. The experimental results were verified by the theoretical simulations. The obtained results would provide a general guideline for understanding the soliton booting dynamics in ultrafast fiber lasers, and will prove to be fruitful to the various communities interested in solitons and fiber lasers. 2The ability of generating ultrashort pulses enables fast development of ultrafast science and technology, which thus, in turn, motivates laser scientists to search for high-performance ultrafast lasers with desirable features for practical applications 1-3 . The ultrashort pulses can be generated from the lasers by the principle of passive mode-locking technologies 4-7 .Generally, the passively mode-locked ultrafast solid-state lasers are considered to possess better performance than fiber lasers 8,9 . However, with the rapid developments of both the laser and optical fiber technologies, now the performance of modern ultrafast fiber lasers becomes to be comparable with the solid-state lasers [11][12][13] . Therefore, the ultrafast fiber lasers are regarded as the candidates of the next-generation ultrashort pulse sources because of their obvious advantages such as robust operation, flexible light path, and excellent heat dissipation.After achieving the passive mode-locking operation in fiber lasers, the ultrashort pulses can be treated as the optical solitons 14 . Due to the high peak power of soliton pulse, the nonlinear effect experienced by the soliton in the fiber could result in the exhibition of abundant nonlinear dynamics by combining with the cavity parameter design. Therefore, in recent decades extensive efforts have been directed toward the investigations of soliton evolution and dynamic...

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“…Coherent beam combining (CBC) of fiber lasers has great potential in breaking through the power limitation of a single laser beam while maintaining good beam quality -a topic that has been widely studied during the past decades [1][2][3][4][5][6][7][8] . In general, CBC techniques can be divided into two categories: filled aperture combining and tiled aperture combining [1] .…”

Section: Introductionmentioning

confidence: 99%

Deep-learning-based phase control method for tiled aperture coherent beam combining systems

Hou

Chang

et al. 2019

High Pow Laser Sci Eng

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We incorporate deep learning (DL) into tiled aperture coherent beam combining (CBC) systems for the first time, to the best of our knowledge. By using a well-trained convolutional neural network DL model, which has been constructed at a non-focal-plane to avoid the data collision problem, the relative phase of each beamlet could be accurately estimated, and then the phase error in the CBC system could be compensated directly by a servo phase control system. The feasibility and extensibility of the phase control method have been demonstrated by simulating the coherent combining of different hexagonal arrays. This DL-based phase control method offers a new way of eliminating dynamic phase noise in tiled aperture CBC systems, and it could provide a valuable reference on alleviating the long-standing problem that the phase control bandwidth decreases as the number of array elements increases.

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High-power coherent beam polarization combination of fiber lasers: progress and prospect [Invited]

Cited by 110 publications

References 76 publications

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Soliton Booting Dynamics in an Ultrafast Anomalous Dispersion Fiber Laser

Deep-learning-based phase control method for tiled aperture coherent beam combining systems

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