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Second-harmonic generation in periodic fork-shaped χ^((2)) gratings at oblique incidence

Chinese Optics Letters 2024年第4期22卷 101-105页

作者：盛艳刘山胡效康陈鑫徐天翔赵如薇 Wieslaw Kroli kowski Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province Ningbo UniversityNingbo 315211China Department of Quantum Science and Technology Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia School of Physics and Optoelectronics Engineering Xidian UniversityXi’an 710071China

Three-dimensional(3D) nonlinear photonic crystals have received intensive interest as an ideal platform to study nonlinear wave interactions and explore their applications. Periodic fork-shaped gratings are extremely important in this context because they are capable of generating second-harmonic vortex beams from a fundamental Gaussian wave, which has versatile applications in optical trapping and materials engineering. However, previous studies mainly focused on the normal incidence of the fundamental Gaussian beam, resulting in symmetric emissions of the second-harmonic vortices. Here we present an experimental study on second-harmonic vortex generation in periodic fork-shaped gratings at oblique incidence, in comparison with the case of normal incidence. More quasi-phase-matching resonant wavelengths have been observed at oblique incidence, and the second-harmonic emissions become asymmetric against the incident *** results agree well with theoretic explanations. The oblique incidence of the fundamental wave is also used for the generation of second-harmonic Bessel beams with uniform azimuthal intensity distributions. Our study is important for a deeper understanding of nonlinear interactions in a 3D periodic medium. It also paves the way toward achieving highquality structured beams at new frequencies, which is important for manipulation of the orbital angular momentum of light.

关键词： second-harmonic generation nonlinear photonic crystal periodically poled ferroelectric crystal quasi-phase matching nonlinear wavefront shaping

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Photon pair generation in lithium niobate waveguide periodically poled by femtosecond laser

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Chinese Optics Letters 2023年第4期21卷 115-119页

作者：戴凡田倩倩黄双印王敏涂成厚盛艳李勇男王慧田 Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071China Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Laser Physics Center Research School of Physics and EngineeringAustralian National UniversityCanberraACT 2601Australia National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Reliable generation of single photons is of key importance for fundamental physical experiments and quantum *** periodically poled lithium niobate[LN]waveguide has shown promise for an integrated quantum source due to its large spectral tunability and high efficiency,benefiting from the *** we demonstrate photon-pair sources based on an LN waveguide periodically poled by a tightly focused femtosecond laser *** pair coincidence rate reaches~8000 counts per second for average pump power of 3.2 m W[peak power is 2.9 k W).Our results prove the possibility of application of the nonlinear photonics structure fabricated by femtosecond laser to the integrated quantum *** method can be extended to three-dimensional domain structures,which provide a potential platform for steering the spatial degree of freedom of the entangled two-photon states.

关键词： photon pair spontaneous parametric downconversion femtosecond laser lithium niobate waveguide quasi-phase matching

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Chip-scale spontaneous quasi-phase matched second harmonic generation in a micro-racetrack resonator

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Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 66-74页

作者： Tingge Yuan Jiangwei Wu Yi'an Liu Xiongshuo Yan Haowei Jiang Hao Li Zhaokang Liang Qiang Lin Yuping Chen Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy.Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China Department of Electrical and Computer Engineering University of RochesterNew York 14627USA

In this paper,we demonstrate efficient spontaneous quasi-phase matched(SQPM)second harmonic generation(SHG)in a microracetrack resonator on X-cut thin film lithium *** approach does not involve poling,but exploits the anisotropy of the crystals to allow the phase-matching condition to be fulfilled spontaneously as the TE-polarized light circulates in a specifically designed racetrack *** experiment,normalized on-chip conversion efficiencies of 1.01×10-4/W and 0.43×10-4/W are achieved by 37th-order and 111th-order SQPM,*** configurable SQPM will benefit the application of nonlinear frequency conversion and quantum source generation in chip-scale integrated photonics compatible with standard CMOS fabrication processes.

关键词： lithium niobate on insulator quasi-phase matching second harmonic generation

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Multi-color laser generation in periodically poled KTP crystal with single period

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Chinese Optics Letters 2023年第2期21卷 76-80页

作者：牛素俭周志远程静欣葛正杨琛史保森 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information&Quantum Physics University of Science and Technology of ChinaHefei 230026China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308China

Frequency conversion based on three-wave mixing is a critical nonlinear optic application,extending the frequency range of existing lasers and realizing frequency-transduced detectors in a wavelength range that lacks an effective *** matching is vital for effective frequency *** advantages of quasi-phase matching(QPM)over birefringent phase matching are a lack of walk-off effect,a maximum nonlinear coefficient,and phase matching in the entire transparency ***,using different types and orders of QPM,four kinds of effective frequency doubling processes are realized in a periodically poled potassium titanyl phosphate(KTP)crystal with a single period,and three kinds of frequency doubling processes are experimentally *** also show a feasible way to construct an RGB color generator based on two different QPM *** study significantly expands the feasible frequency conversion of existing lasers to different wavelengths,providing an effective method for multi-color laser generation based on periodically poled KTP crystals.

关键词： nonlinear optics frequency doubling multi-color laser quasi-phase matching

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Polarization-dependent optical engineering of ferroelectric domains

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ChemPhysMater 2023年第4期2卷 346-350页

作者： Shan Liu Yan Sheng Wieslaw Krolikowski Department of Quantum Science and Technology Research School of PhysicsAustralian National UniversityCanberra 2601Australia Department of Electronic Materials Engineering Research School of PhysicsAustralian National UniversityCanberra 2601Australia Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Science Program Texas A&M University at QatarDoha 23874Qatar

Ferroelectric domain engineering with infrared femtosecond laser pulses has been a powerful technique to achieve a spatially modulated second-order nonlinear coefficient in three ***,studies regarding the in-fluence of laser writing conditions on the light-induced ferroelectric domain inversion remain ***,an experimental study to reveal the role of laser polarization in light-induced domain inversions is *** dependence of the optical threshold and maximal writing depth of inverted domains on light polarization is ex-perimentally *** results are explained by considering the second-order nonlinear optical properties and birefringence-induced focus splitting in the *** findings are useful in fabricating high-quality and large-scale ferroelectric domain structures for applications in optics,electronics,and quantum technologies.

关键词： Nonlinear photonic crystals Ferroelectric domain engineering quasi-phase matching Harmonic generation

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Periodically poled LiNbO3 crystals from 1D and 2D to 3D

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Science China(Technological Sciences) 2020年第7期63卷 1110-1126页

作者： WANG TianXin CHEN PengCheng XU Chuan ZHANG Yong WEI DunZhao HU XiaoPeng ZHAO Gang XIAO Min ZHU ShiNing National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

A periodically-poled LiNbO3(PPLN) crystal features space-dependent second-order nonlinear coefficients, which is one of the most important materials to effectively control nonlinear optical interactions through quasi-phase matching(QPM). By using electric-field poling method, 1D and 2D PPLN crystals have been successfully fabricated for laser frequency conversion, quantum light sources, nonlinear beam shaping and nonlinear optical imaging. Recently, femtosecond laser engineering technique is utilized to prepare 3D domain structures inside LiNbO3 crystal, which provides a promising platform to control nonlinear interacting waves in 3D configuration. After 40 years of developments, PPLN crystals still have exciting prospects in fundamental researches and practical applications for integrated photonic chip, quantum information processing,and so on.

关键词： periodically-poled LiNbO3 quasi-phase matching nonlinear optics

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