Results 191 to 200 of about 7,519 (215)

Dynamical repertoire of brain networks in mindfulness cognitive behavioural therapy during rumination: A randomized controlled trial

Vohryzek J, van der Velden AM, Kuyken W, Montero-Marin J, Collin G, Kringelbach ML, Ruhe E.   +6 more
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Self-starting spatiotemporal mode-locking using Mamyshev regenerators

Optics Letters, 2022
Bridging multi-mode fibers and Mamyshev regenerators holds promise for pulse energy scaling in fiber lasers. However, initialization of a multi-mode Mamyshev oscillator remains a practical challenge. Here we report self-starting spatiotemporal mode-locking (STML) in a multi-mode Mamyshev oscillator without active assistance.
Bo Cao, Chenxin Gao, Yihang Ding, Xiaosheng Xiao, Changxi Yang, Chengying Bao   +5 more
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Spatiotemporal Mode-Locking

Conference on Lasers and Electro-Optics, 2018
We describe, through multiple theoretical and experimental realizations, spatiotemporal mode-locking (STML), the most general form of self-organization in optical oscillators. We discuss qualitatively new kinds of mode-locking, and routes to ultrahigh power, compact lasers.
Wright, Logan G., Christodoulides, Demetrios N., Wise, Frank W.   +2 more
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Narrow bandwidth spatiotemporal mode-locked Yb-doped fiber laser

Optics Letters, 2022
We report a narrow bandwidth spatiotemporal mode-locked (STML) ytterbium-doped fiber laser, based on a homemade carbon nanotube/polyvinyl alcohol composite film and the multimode interference filtering effect. The wavelength-tunable narrow bandwidth STML operations combined with different pulse states are achieved, including single pulse, multiple ...
Tian-Xu Zhao, Guang-Xin Liu, Li-long Dai, Bang Zhao, Hu Cui, Cheng-Bo Mou, Zhi-Chao Luo, Wen-Cheng Xu, Ai-Ping Luo   +8 more
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Dissecting the Mechanisms of Spatiotemporal Mode-Locking

OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF), 2020
We uncover the mechanisms behind a range of new 3D solitons in multimode lasers using an approach called attractor dissection. Experimental measurements allow us to decompose multimode states containing up to 30 million locked modes.
Wright, Logan G., Sidorenko, Pavel, Pourbeyram, Hamed, Ziegler, Zachary M., Isichenko, Andrei, Malomed, Boris A., Menyuk, Curtis, Christodoulides, Demetrios N., Wise, Frank W.   +8 more
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Periodic intensity fluctuations in spatiotemporal mode-locked lasers

Sixteenth National Conference on Laser Technology and Optoelectronics, 2021
We report the periodic intensity fluctuations and period-timing bifurcation in a spatiotemporal mode-locked multimode fiber laser. By adjusting the intracavity waveplate or the pump power, the intensity pattern of the spatiotemporal modelocked output could transit from uniformity to period-2, then to period-4.
Yihang Ding, Xiaosheng Xiao, Shuzheng Fan, Changxi Yang   +3 more
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Period-doubling in spatiotemporal mode-locked lasers

Asia Communications and Photonics Conference/International Conference on Information Photonics and Optical Communications 2020 (ACP/IPOC), 2020
We report on the experimental observation and numerical simulation of the nonlinear dynamic of period-doubling in spatiotemporal mode-locked lasers composed of full-multimode fibers. It is found that the dynamics of different transverse modes are different.
Shuzheng Fan, Xiaosheng Xiao, Xiaoguang Zhang   +2 more
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Wavelength-switchable spatiotemporal mode-locked multimode fiber laser

2021 19th International Conference on Optical Communications and Networks (ICOCN), 2021
We propose and demonstrate a wavelength-switchable spatiotemporal mode-locked multimode fiber laser, which relies on spatial beam self-cleaning via the nonlinear Kerr effect to attain high pulse energy with near Gaussian output beam shape. Moreover, it is found that the wavelength-dependent self-cleaning behavior observed at different wavelengths has ...
Mingwei Qiu, Mengmeng Chen, Zuxing Zhang
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Spatiotemporal dynamics in spatiotemporal mode-locked multimode fiber lasers

2018 Asia Communications and Photonics Conference (ACP), 2018
For the first time, as far as we know, spatiotemporal dynamics are experimentally observed in spatiotemporal mode-locked multimode fiber lasers. A simple theoretical model is proposed, by which the observed spatiotemporal dynamics are explained.
Xiaosheng Xiao, Yihang Ding, Changxi Yang   +2 more
openaire   +1 more source