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Angular engineering strategy of an additional periodic phase for widely tunable phase-matched deep-ultraviolet second harmonic generation

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Light(Science & Applications) 2022年第2期11卷 254-261页

作者： Mingchuan Shao Fei Liang Haohai Yu huaijin zhang State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China

Manipulation of the light phase lies at the heart of the investigation of light-matter interactions,especially for efficient nonlinear optical processes.Here,we originally propose the angular engineering strategy of the additional periodic phase(APP)for realization of tunable phase matching and experimentally demonstrate the widely tunable phasematched second harmonic generation(SHG)which is expected for dozens of years.With an APP quartz crystal,the phase difference between the fundamental and frequency-doubled light is continuously angularly compensated under this strategy,which results the unprecedented and efficient frequency doubling at wavelengths almost covering the deep-UV spectral range from 221 to 332 nm.What’s more,all the possible phase-matching types are originally realized simultaneously under the angular engineering phase-matching conditions.This work should not only provide a novel and practical nonlinear photonic device for tunable deep-UV radiation but also be helpful for further study of the light-matter interaction process.

关键词： tunable phase matched

A General Strategy for Ordered Carrier Transport of Quasi‑2D and 3D Perovskite Films for Giant Self‑Powered Photoresponse and Ultrahigh Stability

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Nano-Micro Letters 2023年第8期15卷 128-140页

作者： Fei Zhu Gang Lian Deliang Cui Qilong Wang Haohai Yu huaijin zhang Qingbo Meng Ching‑Ping Wong State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100People’s Republic of China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan 250100People’s Republic of China Key Laboratory for Renewable Energy Chinese Academy of Sciences(CAS)BeijingPeople’s Republic of China Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsCASBeijing 100190People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Organic–inorganic hybrid perovskite materials have been focusing more attention in the field of self-powered photodetectors due to their superb photoelectric properties.However,a universal growth approach is required and challenging to realize vertically oriented growth and grain boundary fusion of 2D and 3D perovskite grains to promote ordered carrier transport,which determines superior photoresponse and high stability.Herein,a general thermal-pressed(TP)strategy is designed to solve the above issues,achieving uniaxial orientation and single-grain penetration along the film thickness direction.It constructs the efficient channel for ordered carrier transport between two electrodes.Combining of the improved crystal quality and lower trap-state density,the quasi-2D and 3D perovskite-based self-powered photodetector devices(with/without hole transport layer)all exhibit giant and stable photoresponse in a wide spectrum range and specific wavelength laser.For the MAPbI_(3)-based self-powered photodetectors,the largest R_(λ) value is as high as 0.57 A W^(−1)at 760 nm,which is larger than most reported results.Meanwhile,under laser illumination(532 nm),the FPEA_(2)MA_(4)Pb_(5)I_(16)-based device exhibits a high responsivity(0.4 A W^(−1)) value,which is one of the best results in 2DRP self-powered photodetectors.In addition,fast response,ultralow detection limit,and markedly improved humidity,optical and heat stabilities are clearly demonstrated for these TP-based devices.

关键词： Perovskites Thermal-pressed strategy Uniaxial orientation Self-powered photodetectors Stability

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Phonon engineering in Yb:La_(2)CaB_(10)O_(19)crystal for extended lasing beyond the fluorescence spectrum

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Light(Science & Applications) 2023年第9期12卷 1921-1929页

作者： Yanling Cheng Fei Liang Dazhi Lu Jingcheng Feng Guochun zhang Haohai Yu huaijin zhang Yicheng Wu State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Key Lab Functional Crystals and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Since the first invention of the laser in 1960,direct lasing outside the fluorescence spectrum is deemed impossible owing to the“zero-gain”cross-section.However,when electron-phonon coupling meets laser oscillation,an energy modulation by the quantized phonon can tailor the electronic transitions,thus directly creating some unprecedented lasers with extended wavelengths by phonon engineering.Here,we demonstrate a broadband lasing(1000-1280 nm)in a Yb-doped La_(2)CaB_(10)O_(19)(Yb:LCB)crystal,far beyond its spontaneous fluorescence spectrum.Numerical calculations and in situ Raman verify that such a substantial laser emission is devoted to the multiphonon coupling to lattice vibrations of a dangling“quasi-free-oxygen”site,with the increasing phonon numbers step-by-step(n=1–6).This new structural motif provides more alternative candidates with strong-coupling laser materials.Moreover,the quantitative relations between phonon density distribution and laser wavelength extension are discussed.These results give rise to the search for on-demand lasers in the darkness and pave a reliable guideline to study those intriguing electron-phonon-photon coupled systems for integrated photonic applications.

关键词： beyond lasing spectrum

Assembly of flower-like VS_(2)/N-doped porous carbon with expanded(001)plane on rGO for superior Na-ion and K-ion storage

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Nano Research 2022年第5期15卷 4108-4116页

作者： Junwei Sun Gang Lian Laiying Jing Di Wu Deliang Cui Qilong Wang Haohai Yu huaijin zhang Ching-Ping Wong State Key Lab of Crystal Materials Shandong UniversityJinan 250100China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan 250100China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

VS2 with natural layered structure and metallic conductivity is a prospective candidate for sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).However,due to large radius of Na+and K+,the limited interlayer spacing(0.57 nm)of VS2 generally determines high ion diffusion barrier and large volume variation,resulting in unsatisfactory electrochemical performance of SIBs and PIBs.In this work,flower-like VS_(2)/N-doped carbon(VS_(2)/N-C)with expanded(001)plane is grown on reduced graphene oxide(rGO)via a solvothermal and subsequently carbonization strategy.In the VS_(2)/N-C@rGO nanohybrids,the ultrathin VS2"petals"are alternately intercalated by the N-doped porous carbon monolayers to achieve an expanded interlayer spacing(1.02 nm),which can effectively reduce ions diffusion barrier,expose abundant active sites for Na+/K+intercalation,and tolerate large volume variation.The N-C and rGO carbonous materials can significantly promote the electrical conductivity and structural stability.Benefited from the synergistic effect,the VS2/N-C@rGO electrode exhibits large reversible capacity(Na+:407 mAh·g^(-1) at 1 A·g^(-1);K^(+):334 mAh·g^(-1) at 0.2 A·g^(-1)),high rate capacity(Na+:273 mAh·g^(-1) at 8 A·g^(-1);K+:186 mAh·g^(-1) at 5 A·g^(-1)),and remarkable cycling stability(Na+:316 mAh·g^(-1) at 2 A·g^(-1) after 1,400 cycles;K^(+):216 mAh·g^(-1) at 1 A·g^(-1) after 500 cycles).

关键词： VS_(2) N-doped porous carbon,graphene substrate expanded interlayer spacing sodium-ion batteries potassium-ion batteries

Saturable absorption and visible pulse modulation of few-layer topological nodal-line semimetal HfGeTe

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Chinese Optics Letters 2024年第3期22卷 89-94页

作者：赵启明张首焱王树贤王刚于浩海张怀金 State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Topological nodal-line semimetals attract growing research attention in the photonic and optoelectronic fields due to their unique topological energy-level bands and fascinating nonlinear optical responses.Here,to the best of our knowledge,we first report the saturable absorption property of topological nodal-line semimetal HfGeTe and the related pulse modulation in passively Q-switched visible lasers.Few-layer HfGeTe demonstrates outstanding saturable absorption properties in the visible-light band,yielding the saturation intensities of 7.88,12.66,and 6.64μJ/cm^(2)at 515,640,and 720 nm,respectively.Based on an as-prepared few-layer HfGeTe optical switch and a Pr:LiYF_(4)gain medium,Q-switched visible lasers are also successfully achieved at 522,640,and 720 nm.The minimum pulse widths of the green,red,and deep-red pulsed lasers are150,125.5,and 420 ns,respectively.Especially for the green and red pulsed laser,the obtained pulse width is smaller than those of the low-dimensional layered materials.Our work sheds light on the application potential of topological nodal-line semimetals in the generation of visible pulsed lasers.

关键词： visible pulsed laser topological nodal-line semimetals saturable absorption Q-switching Pr doping

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Pushing periodic-disorder-induced phase matching into the deep-ultraviolet spectral region:theory and demonstration

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Light(Science & Applications) 2020年第1期9卷 1590-1597页

作者： Mingchuan Shao Fei Liang Haohai Yu huaijin zhang State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China

Nonlinear frequency conversion is a ubiquitous technique that is used to obtain broad-range lasers and supercontinuum coherent sources.The phase-matching condition(momentum conservation relation)is the key criterion but a challenging bottleneck in highly efficient conversion.Birefringent phase matching(BPM)and quasiphase matching(QPM)are two feasible routes but are strongly limited in natural anisotropic crystals or ferroelectric crystals.Therefore,it is in urgent demand for a general technique that can compensate for the phase mismatching in universal nonlinear materials and in broad wavelength ranges.Here,an additional periodic phase(APP)from order/disorder alignment is proposed to meet the phase-matching condition in arbitrary nonlinear crystals and demonstrated from the visible region to the deep-ultraviolet region(e.g.,LiNbO_(3) and quartz).Remarkably,pioneering 177.3-nm coherent output is first obtained in commercial quartz crystal with an unprecedented conversion efficiency above 1‰.This study not only opens a new roadmap to resuscitate those long-neglected nonlinear optical crystals for wavelength extension,but also may revolutionize next-generation nonlinear photonics and their further applications.

关键词： matching ultraviolet periodic

Three-dimensional nonlinear photonic crystal in naturally grown potassium–tantalate–niobate perovskite ferroelectrics

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Light(Science & Applications) 2020年第1期9卷 122-129页

作者： Chang Li Xuping Wang Yang Wu Fei Liang Feifei Wang Xiangyong Zhao Haohai Yu huaijin zhang State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Key Laboratory of Optoelectronic Material and Device Department of PhysicsShanghai Normal UniversityShanghai 200234China

Since quasi-phase-matching of nonlinear optics was proposed in 1962,nonlinear photonic crystals were rapidly developed by ferroelectric domain inversion induced by electric or light poling.The three-dimensional(3D)periodical rotation of ferroelectric domains may add feasible modulation to the nonlinear coefficients and break the rigid requirements for the incident light and polarization direction in traditional quasi-phase-matching media.However,3D rotating ferroelectric domains are difficult to fabricate by the direct external poling technique.Here,we show a natural potassium-tantalate-niobate(KTN)perovskite nonlinear photonic crystal with spontaneous Rubik’s cube-like domain structures near the Curie temperature of 40℃.The KTN crystal contains 3D ferroelectric polarization distributions corresponding to the reconfigured second-order susceptibilities,which can provide rich reciprocal vectors to compensate for the phase mismatch along an arbitrary direction and polarization of incident light.Bragg diffraction and broadband second-harmonic generation are also presented.This natural nonlinear photonic crystal directly meets the 3D quasi-phase-matching condition without external poling and establishes a promising platform for all-optical nonlinear beam shaping and enables new optoelectronic applications for perovskite ferroelectrics.

关键词： nonlinear perovskite ferroelectric

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倍半氧化物激光陶瓷的研究进展

硅酸盐学报 2024年第3期52卷 1006-1022页

作者：李晴王俊马杰刘鹏沈德元章健于浩海张怀金唐定远山东大学晶体材料国家重点实验室济南250100 江苏师范大学江苏省先进激光材料与器件重点实验室江苏徐州221116 中国科学院上海硅酸盐研究所上海201899 深圳技术大学聚龙学院广东深圳518118

倍半氧化物透明陶瓷具有声子能量低、热膨胀系数低、损伤阈值高、热导率高等优势,在固体激光领域有着极大的应用前景。提出了研制高质量倍半氧化物透明陶瓷亟需解决的瓶颈问题,阐述了在倍半氧化物陶瓷制备过程中提高光学质量、减少晶格... 详细信息

倍半氧化物透明陶瓷具有声子能量低、热膨胀系数低、损伤阈值高、热导率高等优势,在固体激光领域有着极大的应用前景。提出了研制高质量倍半氧化物透明陶瓷亟需解决的瓶颈问题,阐述了在倍半氧化物陶瓷制备过程中提高光学质量、减少晶格缺陷的关键措施,总结了稀土离子掺杂倍半氧化物陶瓷在1~3μm波段固体激光器应用中的代表性成果,并对倍半氧化物激光陶瓷的未来发展进行了展望。

关键词：倍半氧化物透明陶瓷稀土离子激光陶瓷固体激光

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强激光用非线性光学晶体研究进展(特邀)

激光与光电子学进展 2024年第1期61卷 336-352页

作者：徐明霞于浩海路大治孙洵许心光张怀金山东大学晶体材料国家重点实验室山东济南250100

以磷酸二氢钾(KDP)/磷酸二氘钾(DKDP)、三硼酸锂(LBO)、硼酸氧钙钇(YCOB)和硅酸镓镧族铌酸镓镧(LGN)为代表的非线性光学晶体已经在紫外到中红外的系列激光技术中获得了重要应用,长期受到国内外同行的广泛关注,其品质的提升和口径的扩大... 详细信息

以磷酸二氢钾(KDP)/磷酸二氘钾(DKDP)、三硼酸锂(LBO)、硼酸氧钙钇(YCOB)和硅酸镓镧族铌酸镓镧(LGN)为代表的非线性光学晶体已经在紫外到中红外的系列激光技术中获得了重要应用,长期受到国内外同行的广泛关注,其品质的提升和口径的扩大成为了当前国际竞争的焦点。着眼于强激光的重要需求,综述了KDP/DKDP、LBO、YCOB和LGN等重要非线性光学晶体的研究现状,介绍了其在大尺寸单晶生长及非线性光学性能等方面的研究进展,分析其在强激光非线性光学领域的应用前景。最后讨论了强激光用非线性光学晶体可能的发展方向和重点。

关键词：非线性光学非线性光学晶体晶体生长频率转换光参量啁啾脉冲放大