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转角相位匹配实现亚相干长度非线性光学调控

Science Bulletin 2024年第9期69卷 1170-1172页

作者：谢臻达吕新杰祝世宁 National Laboratory of Solid State Microstructures School of Electronic Science and EngineeringCollege of Engineering and Applied SciencesSchool of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

As recognized since the very early age in the 1960s [1], phase matching is always the crucial problem throughout the development of the nonlinear optics up to date. This problem of the phase mismatch is raised as result of material dispersion inside a nonlinear crystal, from the momentum conservation in the optical nonlinear interaction process. In the case of the second harmonic(SH) generation, for example, the momentum of an SH photon is normally not matched to the sum of the momenta of the two fundamental beam photons, due to their different refractive indexes.

关键词：非线性光学相干长度相位匹配

Passively stable 0.7-octave microcombs in thin-film lithium niobate microresonators

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Chinese Optics Letters 2024年第5期22卷 53-56页

作者：赵泽兴王晨宇邱静远叶志霖尹志军王振林贾琨鹏田晓慧谢臻达祝世宁 National Laboratory of Solid State Microstructures School of Electronic Science and EngineeringSchool of PhysicsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Nanzhi Institute of Advanced Optoelectronic Integration Technology Co. Ltd.Nanjing 210093China

The optical frequency comb based on microresonators(microcombs)is an integrated coherent light source and has the potential to promise a high-precision frequency standard;self-reference and a long-term stable microcomb are the keys to this ***,we demonstrated a 0.7-octave spectrum Kerr comb via dispersion engineering in a thin-film lithium niobate microresonator,and the single-soliton state can be accessed passively with long-term stability over 3 *** such a robust broadband coherent comb source using thin-film lithium niobate,a fully stabilized microcomb can be expected for massive practical applications.

关键词： thin-film lithium niobate soliton microcomb photorefractive effect

LiNbO_(3)crystals:from bulk to film

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Advanced Photonics 2022年第3期4卷 4-5页

作者： zhenda xie Shining Zhu Nanjing University College of Engineering and Applied SciencesSchool of PhysicsSchool of Electric Science and EngineeringNational Laboratory of Solid State MicrostructuresNanjingChina Nanjing University Ministry of EducationKey Laboratory of Intelligent Optical Sensing and ManipulationNanjingChina Collaborative Innovation Center of Advanced Microstructures NanjingChina

Lithium niobate^(1,2) is a ferroelectric crystal that features superior electrooptical,nonlinear optical,and acoustic optical performance,and it is thus prominent in various optoelectronic *** breakthroughs in the fabrication of thin film lithium niobate(TFLN)combine the unique features of the bulk crystal onto an integrated platform with submicron light confinement,driving new records in reducing the energy consumption for high-speed electro-optical modulation,3–5 the footprint for acoustic wave filtering,6 and the power requirement for efficient optical frequency conversion.7–9 TFLN is mainly fabricated using the smart cut technique,10,11 which was developed for silicon-oninsulator materials12 and is known for its capability for manufacturing high-quality,large-sized crystalline *** performances are expected by moving from bulk to TFLN,e.g.,in the form of lithium-niobate-on-insulator(LNOI)optical communication and wireless communication devices,and this trend may also lead to fundamental breakthroughs in optical computation,microwave photonics,and quantum optics,as discussed below.

关键词： film breakthrough optics

Dissipative soliton generation and real-time dynamics in microresonator-filtered fiber lasers

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Light(Science & Applications) 2022年第11期11卷 2676-2686页

作者： Mingming Nie Bowen Li Kunpeng Jia Yjun xie Jingjie Yan Shining Zhu zhenda xie Shu-Wei Huang Department of Electrial Computer and Energy EngineeringUniversity of Colorado BoulderBoulderColorado 80309USA School of Electronic Science and Engineering National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesSchool of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Optical frequency combs in microresonators(microcombs)have a wide range of applications in science and technology,due to its compact size and access to considerably larger comb *** recent successes,the problems of self-starting,high mode efficiency as well as high output power have not been fully addressed for conventional soliton *** demonstration of laser cavity soliton microcombs by nesting a microresonator into a fiber cavity,shows great potential to solve the *** we study the dissipative soliton generation and interaction dynamics in a microresonator-fltered fiber laser in both theory and *** bring theoretical insight into the mode-locking principle,discuss the parameters effect on soliton properties,and provide experimental guidelines for broadband soliton *** predict chirped bright dissipative soliton with flat-top spectral envelope in microresonators with normal dispersion,which is fundamentally forbidden for the externally driven ***,we experimentally achieve soliton microcombs with large bandwidth of~10 nm and high mode efficiency of 90.7%.Finally,by taking advantage of an ultrahigh-speed time magnifier,we study the real-time soliton formation and interaction dynamics and experimentally observe soliton Newton's *** study will benefit the design of the novel,high-efficiency and self-starting microcombs for real-world applications.

关键词： resonator fiber soliton

Enhanced saturable absorption of MoS2 black phosphorus composite in 2μm passively Q-switched Tm:YAP laser

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Chinese Optics Letters 2018年第2期16卷 113-116页

作者： Yang Xue zhenda xie Zhilin Ye Xiaopeng Hu Zinlong Xu Han Zhang National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China College of Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

We report the fabrication of an MoS2 black phosphorus（BP） composite saturable absorber by liquid phase exfoliation and the spin-coating method and further exploitation to build a 2 μm passively Q-switched Tm：YAP laser. Such a composite based Q-switched laser with a duration of 488 ns and corresponding peak power of 85.9 W is obtained, which shows an improved saturable absorption effect than that of single MoS2（616 ns,68.7 W） and BP（932 ns, 22.4 W）. The results indicate that simple and reasonable fabrication of the vertical composite from two-dimensional atomic layer materials opens up the possibility to create an unprecedented saturable absorber with exciting properties.

关键词： YAP laser Mo BP m passively Q-switched Tm

Localization and Steering of Light in One-Dimensional Parity-Time Symmetric Photonic Lattices

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Chinese Physics Letters 2019年第1期36卷 14-18页

作者： Xing Wei zhenda xie Yan-Xiao Gong Xinjie Lv Gang Zhao ShiNing Zhu National Laboratory of Solid State Microstructures and School of Physics Nanjing University College of Electronic Science and Engineering National Laboratory of Solid State MicrostructuresNanjing University College of Engineering and Applied Sciences National Laboratory of Solid State MicrostructuresNanjing University

We theoretically study the propagation dynamics of input light in one-dimensional mixed linear-nonlinear photonic lattices with a complex parity-time symmetric potential. Numerical computation shows simultaneous localization and steering of the optical beam due to the asymmetric scatter and interplay between Kerr-type nonlinearity and PT symmetry. This may provide a feasible measure for manipulation light in optical communications, integrated optics and so on.

关键词： Localization Steering One-Dimensional Parity-Time Symmetric Photonic Lattices

Liquid metal as a broadband saturable absorber for passively Q-switched lasers

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Chinese Optics Letters 2020年第11期18卷 63-67页

作者： Tianqi Zhang Mudong Wang Yang Xue Jinlong Xu zhenda xie Shining Zhu National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China School of Physics Nanjing UniversityNanjing 210093China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China

We demonstrated the efficient plasmon-induced nonlinear absorption of liquid metal GaInSn nanospheres prepared by a facile liquid-phase method. With GaInSn as saturable absorbers, a passively Q-switching operation was obtained at both 1.3 and 2 μm. The pulse width of 32 ns was achieved at 1.3 μm with repetition rate of44 kHz, single pulse energy of 51.9 μJ, and output power of 425 mW. Meanwhile, 510 ns and 92 kHz pulses with energy of 36.1 μJ and output power of 2.48 W were obtained at 2 μm. This work provides the potential of liquid metal for improving metal functions and flexible optical devices.

关键词： GaInSn nanosphere passively Q-switched lasers saturable absorber

Enhanced nonlinear optical response of layered WSe1.4Te0.6 alloy in 1 μm passively Q-switched laser

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Chinese Optics Letters 2019年第12期17卷 59-63页

作者： Zhengting Du Tianqi Zhang zhenda xie Jian Ning Xinjie Lü Jinlong Xu Shining Zhu College of Engineering and Applied Sciences National Laboratory of Solid State MicrostructuresNanjing UniversityNanjing 210093China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China

Due to the composition-dependent properties of two-dimensional(2D)transition metal dichalcogenides(TMDs),alloying of existing dissimilar TMDs architecture is a novel and controllable route to tailor crystal structures with superior optical and optoelectronic ***,we reported the hexagonal-phase WSe1.4Te0.6 alloy can enable great promise for enhanced saturable absorption response exceeding the parent component WSe2 and WTe2,with larger modulation depth and lower saturable *** advantages allowed the 1064 nm passively Q-switched lasers based on WSe1.4Te0.6 to be more efficient,with pulse duration narrowed to 45%,and slope efficiency increased by 232%.Our findings highlighted the appropriate alloying of TMDs as an effective strategy for development of saturable absorbers.

关键词： switched passive optical

Effect of thickness variations of lithium niobate on insulator waveguide on the frequency spectrum of spontaneous parametric down-conversion

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Chinese Physics B 2021年第11期30卷 268-273页

作者： Guang-Tai Xue Xiao-Hui Tian Chi Zhang zhenda xie Ping Xu Yan-Xiao Gong Shi-Ning Zhu National Laboratory of Solid State Microstructures School of PhysicsSchool of Electronic Science and EngineeringCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Institute for Quantum Information and State Key Laboratory of High Performance Computing College of ComputingNational University of Defense TechnologyChangsha 410073China

We study the effect of waveguide thickness variations on the frequency spectrum of spontaneous parametric downconversion in the periodically-poled lithium niobate on insulator(LNOI)*** analyze several variation models and our simulation results show that thickness variations in several nanometers can induce distinct effects on the central peak of the spectrum,such as narrowing,broadening,and *** also prove that the effects of positive and negative variations can be canceled and thus lead to a variation-robust feature and an ultra-broad *** study may promote the development of on-chip photon sources in the LNOI platform,as well as opens up a way to engineer photon frequency state.

关键词： lithium niobate on insulator spontaneous parametric down-conversion waveguide thickness variation frequency spectrum