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Spatiotemporal mode-locking and dissipative solitons in multimode fiber lasers

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Light(Science & Applications) 2023年第11期12卷 2309-2324页

作者： Bo Cao Chenxin Gao Kewei Liu Xiaosheng Xiao changxi yang Chengying Bao State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China State Key Laboratory of Information Photonics and Optical Communications School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

Multimode fiber(MMF)lasers are emerging as a remarkable testbed to study nonlinear spatiotemporal physics with potential applications spanning from high energy pulse generation,precision measurement to nonlinear *** underlying mechanism for the generation of ultrashort pulses,which can be understood as a spatiotempoal dissipative soliton(STDS),in the nonlinear multimode resonators is the spatiotemporal mode-locking(STML)with simultaneous synchronization of temporal and spatial *** this review,we first introduce the general principles of STML,with an emphasize on the STML dynamics with large intermode ***,we present the recent progress of STML,including measurement techniques for STML,exotic nonlinear dynamics of STDS,and mode field engineering in MMF *** conclude by outlining some perspectives that may advance STML in the near future.

关键词： dissipative nonlinear locking

Diffraction from the Second-Order Photorefractive Grating in Paraelectric KTa_(1-x)Nb_(x)O_(3) Crystals

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Chinese Physics Letters 1993年第4期10卷 235-237页

作者： LIAN Yingwu yang changxi YE Peixian GUAN Qingcai WANG Jiyang Institute of Physics Academia SinicaBeijing 100080 Institute of Crystal Materials Shandong UniversityJinan 250100

Diffraction from the second-order photorefractive grating written in KTa_(1-x)Nb_(x)O_(3)(x=0.32)crystal with cubic phase has been observed for the first *** behaviors of this diffraction have been investigated *** qu... 详细信息

关键词： qualitative cubic

Observation of transition between multimode Q-switching and spatiotemporal mode locking

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Photonics Research 2021年第4期9卷 530-534页

作者： Kewei Liu Xiaosheng Xiao changxi yang State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China State Key Laboratory of Information Photonics and Optical Communications School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

We report experimental observation of multimode Q-switching and spatiotemporal mode locking in a multimode fiber laser.A typical steady Q-switching state is achieved with a 1.88μs pulse duration,a 70.14 kHz repetition rate,and a 215.8 mW output power,corresponding to the single pulse energy of 3.08μ*** find weak spatial filtering is essential to obtain stable Q-switched pulses,in contrast to the relatively stronger spatial filtering for spatiotemporal mode ***,a reversible transition process,as well as a critical bistable state,between multimode Q-switching and spatiotemporal mode locking,is achieved with specific spatial coupling and waveplates *** believe the results will not only contribute to understanding the complicated nonlinear dynamics in multimode,fiber-based platforms,but also benefit the development of promising high-pulse energy lasers.

关键词： multimode fiber switched

Real-time collision dynamics of vector solitons in a fiber laser

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Photonics Research 2021年第3期9卷 289-298页

作者： Kangjun Zhao Chenxin Gao Xiaosheng Xiao changxi yang State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

Particle-like structures of solitons, as a result of the balance between dispersion and nonlinearity, enable remarkable elastic and inelastic soliton collisions in many fields. Despite the experimental observation of temporal vector-soliton collisions in birefringent fibers, collision dynamics of vector solitons in fiber lasers have not been revealed before, to the best of our knowledge. Here, the real-time spectral evolutions of vector solitons during collisions in a dual-comb fiber laser, which generates vector solitons with slightly different repetition rates, are captured by a time-stretch dispersive Fourier transform technique. We record the whole process of vector-soliton collisions, including the formation of weak pulses induced by cross-polarization coupling, opposite central wavelength shifts of both vector solitons, distinct intensity redistribution and dissipative energy, and gradual recovery to initial states. Furthermore, extreme collisions with strong four-wave mixing sidebands are observed by virtue of coherent coupling between the orthogonal polarization components of vector solitons. Numerical simulations match well with the experimental observations. The experimental and numerical evidences of vector-soliton collision dynamics could give insight into the understanding of nonlinear dynamics in fiber lasers and other physical systems, as well as the improvement of laser performance for application in dual-comb spectroscopy.

关键词： fiber polarization solitons

Photo refractive Proper ties of Paraelec trie Copper Doped Pot assium Tant ala te Niobate

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Chinese Physics Letters 1991年第10期8卷 515-517页

作者： GUAN Qingcai WANG Jiyang WANG Min LIU Yaogang WEI Jingqian ZHANG Zhiguo yang changxi YE Peixian Institute of Crystal Materials Shandong UniversityJi'nan 250100 Institute of Physics Academia sinicaBeijing 100080

The photorefractive properties of Cu doped KTa_(1-x)Nb_(x)O_(3) have been st tidied by using two-wave mixing *** diffraction efficiency reaches as high as 52%under an electric *** dependences of diffraction efficiency on interference angles and applied fields Aave been *** maximum light induced index chajige is found to be 2.33×10^(-5) and the photorefraction sensitivity calculated is 5×10^(-6)cm^(2)/*** results demonstrate that electrons are the dominant charge carriers.

关键词： method refractive Copper

Upconversion-luminescent hydrogel optical probe for in situ dopamine monitoring

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Photonics Research 2020年第11期8卷 1800-1807页

作者： Bingqian Zhou Jingjing Guo changxi yang Lingjie Kong State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Dopamine(DA),as a neurotransmitter in human brain,plays a crucial role in reward motivation and motor *** improper level of DA can be associated with neurological disorders such as schizophrenia and Parkinson’s *** quantify DA,optical DA sensors have emerged as an attractive platform due to their capability of high-precision and label-free measurement,and immunity to electromagnetic ***,the lack of selectivity,limited biocompatibility,and complex fabrication processes are challenges that hinder their clinical ***,we report a soft and biocompatible luminescent hydrogel optical sensor capable of recognizing and quantifying DA with a simple and compact interrogation *** sensor is made of a hydrogel optical fiber(HOF)incorporated with upconversion nanoparticles(UCNPs).DA molecules are detected through the luminescence energy transfer(LET)between the UCNPs and the oxidation products of DA,while the light-guiding HOF enables both excitation and emission collection of the *** hydrogel sensor provides an optical readout that shows a linear response up to 200μmol/L with a detection limit as low as 83.6 nmol/*** results show that the UCNP-based hydrogel sensor holds great promise of serving as a soft and biocompatible probe for monitoring DA in situ.

关键词： holds attractive enable

Pattern formation in 2-μm Tm Mamyshev oscillators associated with the dissipative Faraday instability

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Photonics Research 2019年第11期7卷 1287-1295页

作者： Pan Wang Shunyu Yao Philippe Grelu Xiaosheng Xiao changxi yang State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China Laboratoire ICB UMR 6303 CNRS Universite Bourgogne Franche-ComteF-21078 Dijon CedexFrance

We investigate numerically the pattern formation in 2-μm thulium-doped Mamyshev fiber oscillators, associated with the dissipative Faraday instability. The dispersion-managed fiber ring oscillator is designed with commercial fibers, allowing the dynamics for a wide range of average dispersion regimes to be studied, from normal to nearzero cavity dispersion where the Benjamin–Feir instability remains inhibited. For the first time in the 2-μm spectral window, the formation of highly coherent periodic patterns is demonstrated numerically with rates up to ~100 GHz. In addition, irregular patterns are also investigated, revealing the generation of rogue waves via nonlinear collision processes. Our investigations have potential applications for the generation of multigigahertz frequency combs. They also shed new light on the dissipative Faraday instability mechanisms in the area of nonlinear optical cavity dynamics.

关键词： dynamics. Faraday dissipative

Self-Pumped Phase Conjugation of Co-Doped (KNa)_(0.1)(Sr_(0.75)Ba_(0.25))_(0.9)Nb_(2)O_(6) Crystal

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Chinese Physics Letters 1992年第3期9卷 137-139页

作者： SUN Daliang CHEN Huanchu JIANG Quanzhong CHEN Jun ZHANG Zhiguo yang changxi Institute of Crystal Materials Shandong UniversityJi’nan 250100 Institute of Physics Academia SinicaBeijing 100080

Self-pumped phase conjugate in trapezoid-cut Co-doped (KNa)_(0.1)(Sr_(0.75)Ba_(0.25))_(0.9)Nb_(2)O_(6)(Co-KNSBN)crystal was demonstrated without external reflection mirrors and applied field,phase conjugation reflectivities as high as 40.5%were *** threshold power was lower than 0.02 W/cm^(2).The device was operated in one-region four-wave mixing using the photorefractive effect.

关键词： effect conjugate

Buildup dynamics of multiple solitons in spatiotemporal mode-locked fiber lasers

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Photonics Research 2021年第10期9卷 1898-1906页

作者： KEWEI LIU XIAOSHENG XIAO YIHANG DING HONGYAN PENG DONGDONG LV changxi yang State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China State Key Laboratory of Information Photonics and Optical Communications School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China School of Physics and Electronic Engineering Hainan Normal UniversityHaikou 571158China

Spatiotemporal mode locking is a nonlinear process of multimode soliton *** the real-time buildup dynamics of the multiple solitons in a spatiotemporal mode-locked multimode fiber laser are investigated,assisted by the time-stretch *** find that the buildup processes are transverse mode dependent,especially during the stages of relaxation oscillation and Q-switching prior to multiple soliton ***,we observe that the transverse modal composition of these generated pulses among the multiple solitons can be different from each other,indicating the spatiotemporal structure of the multiple soliton.A simplified theoretical model based on pulse energy evolution is put forward to interpret the role of 3D saturable absorber on spatiotemporal structures of spatiotemporal mode-locking multiple *** work has presented the spatiotemporal nonlinear dynamics in multimode fiber lasers,which are novel to those inside the single transverse mode fiber lasers.

关键词： fiber mode solitons