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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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Wavelength-dependent nonlinear wavefront shaping in 3D nonlinear photonic crystal

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Chinese Optics Letters 2024年第7期 71-75页

作者：王韵泽盛艳刘山赵如薇徐天翔徐铁峰陈峰 wieslaw krolikowski Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo University Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province Ningbo University Quantum Science and Technology Research School of PhysicsAustralian National University Ningbo Institute of Oceanography State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation of the Ministry of Education School of PhysicsShandong University

A 3D nonlinear photonic crystal containing four parallel segments of periodicχ（2）grating structure is fabricated employing the femtosecond laser poling of ferroelectric *** second harmonic generation from this foursegment structure is studied with a fundamental Gaussian *** tuning the wavelength of the fundamental wave,the second harmonic varies from the Laguerre–Gaussian beam （topological charge lc=1） to the higher-order Hermite–Gaussian beam and Laguerre–Gaussian again （lc=-1）.This effect is caused by the wavelength-dependent phase delays introduced by the four-grating *** study contributes to a deeper understanding of nonlinear wave interactions in3D nonlinear photonic *** also offers new possibilities for special beam generation at new frequencies and their control.

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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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Nonlinear Talbot self-healing in periodically poled LiNbO_3 crystal [Invited]

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Chinese Optics Letters 2021年第6期19卷 50-53页

作者：王炳霞刘山徐天翔赵茹薇陆培祥 wieslaw krolikowski 盛艳 Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and TechnologyWuhan 430074China Laser Physics Center Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia Science Program Texas A&M University at QatarDoha 23874Qatar

The nonlinear Talbot effect is a near-field nonlinear diffraction phenomenon in which the self-imaging of periodic objects is formed by the second harmonics of the incident laser beam. We demonstrate the first, to the best of our knowledge, example of nonlinear Talbot self-healing, i.e., the capability of creating defect-free images from faulty nonlinear optical structures. In particular, we employ the tightly focused femtosecond infrared optical pulses to fabricate LiNbO_(3) nonlinear photonic crystals and show that the defects in the form of the missing points of two-dimensional square and hexagonal periodic structures are restored in the second harmonic images at the first nonlinear Talbot plane. The observed nonlinear Talbot self-healing opens up new possibilities for defect-tolerant optical lithography and printing.

关键词： nonlinear Talbot effect nonlinear photonic crystal periodically poled LiNbO_(3) second harmonic generation self-healing

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激光刻写三维全息图产生涡旋倍频的实验和理论研究

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红外与毫米波学报 2021年第1期40卷 102-107页

作者：陈鑫尹恒刘山赵璧君王军利盛艳魏志义 krolikowski wieslaw 西安电子科技大学物理与光电工程学院陕西西安710071 澳大利亚国立大学物理研究学院激光技术中心堪培拉2601 中国科学院物理研究所北京凝聚态物理国家实验室北京100190 德克萨斯A&M大学卡塔尔分校科学项目组多哈23874

涡旋光通常需借助外部光学元件或结构将高斯光束整形来产生。激光引发的光致折变结构可以将光束整形功能直写到材料内部,具有便于集成和稳定性好等优点,但这种线性衍射通常无法获得高效的倍频涡旋输出。为解决该问题,首先实验研究了铌... 详细信息

涡旋光通常需借助外部光学元件或结构将高斯光束整形来产生。激光引发的光致折变结构可以将光束整形功能直写到材料内部,具有便于集成和稳定性好等优点,但这种线性衍射通常无法获得高效的倍频涡旋输出。为解决该问题,首先实验研究了铌酸锂中激光直写参量对光致折变结构分辨率和最大深度的影响,并刻写三维全息图将高斯基频光转换为十字形涡旋倍频;之后理论证明了利用基频的布拉格衍射,可在1.074~3.716μm范围产生相位匹配的涡旋倍频输出。

关键词：体相位全息图飞秒激光直写光束整形频率变换

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Composite structure Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG ceramics with high color spatial uniformity for white laser lighting

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Journal of Advanced Ceramics 2024年第2期13卷 189-197页

作者： Pengfei Sang Le Zhang Jian Kang Mingzhou Li Shiwei Chen Peng Yang Bingheng Sun Yang Li wieslaw Strek Hao Chen Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology Xuzhou 221400China Xuzhou EAGLED Technology Co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials Technology Co. Ltd.Xuzhou 221116China Xuzhou Fuchang Electronic Technology Co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China School of Material Science and Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland

Composite ceramic phosphor(CCP)is a candidate light-conversion material to obtain the high-quality laser lighting *** based on the transmissive configuration model could not simultaneously meet the requirements of angular color uniformity and high thermal *** this study,a novel composite structure ceramic was designed,including Al_(2)O_(3)-YAG:Ce/YAG layered ceramic with a size of 1 mm×1 mm for lighting,and Al_(2)O_(3) ceramic(φ=16.0 mm)was used as the wrapping material due to its outstanding thermal *** prepared ceramics exhibited excellent thermal performance and no yellow ring *** this design,we achieved the match of the intensity distribution of the blue and yellow lights,resulting in a high angular color uniformity of 0.9 with a view angle of±80°.All ceramics showed no luminous saturation phenomenon,even the laser power density was increased up to 47.51 W/mm^(2).A high-brightness white-light source with a luminous flux of 618 lm,a luminous efficiency of 126 lm/W,a CCT of 6615 K,and a CRI of 69.9 was obtained in the transmissive *** particular,the surface temperature of the ceramic was as low as 74.1℃ under a high laser radiation(47.51 W/mm^(2)).These results indicate that Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG composite structure ceramic is a promising luminescent material in the high-power laser lighting applications.

关键词： Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG angular color uniformity high thermal stability high-power laser lighting

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High recorded color rendering performance of single-structured Ce,Mn:Y_(3)(Al,Sc)_(2)Al_(3)O_(12)phosphor ceramics for high-power white LEDs/LDs

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Journal of Advanced Ceramics 2024年第6期13卷 810-820页

作者： Xuanchu Liu Congcong Yang Yanbin Li Chang Min Jian Kang Tianyuan Zhou Chunming Zhou Chaofan Shi Cen Shao Bingheng Sun wieslaw Strek Hao Chen Le Zhang Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology Xuzhou 221400China Xuzhou EAGLED Technology Co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials Technology Co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Achieving a high color rendering index(CRI)and luminous stability in single-structured Ce:Y_(3)Al_(5)O_(12)(Ce:YAG)phosphor ceramics(PCs)is crucial for high-power white light-emitting diodes or laser diodes(LEDs/LDs).However,cyan valleys and insufficient amounts of the red component in the Ce:YAG emission spectra significantly limit their real *** this work,a series of Ce,Mn:Y_(3)(Al,Sc)_(2)Al_(3)O_(12)(Ce,Mn:YSAG)PCs were fabricated by vacuum sintering,and efficient spectral regulation was realized for full-color *** cyan valley was filled by the blueshifted emission peak of Ce^(3+)via Sc^(3+)*** orange‒red emission at approximately 580 nm was effectively supplemented via Mn^(2+)*** particular,CRI of Ce,Mn:YSAG increased from 56.4 to 85.8,a 52%increase compared with that of Ce:YAG under high-power LED excitation,and the operating temperature was stable at approximately 50℃for long working ***,CRI of 80.9 could still be obtained for PC-based white *** results indicated that Ce,Mn:YSAG PC,which has excellent CRI and luminous stability,is an extremely promising color convertor for high-power white LEDs/LDs.

关键词： color rendering index(CRI) color converter Ce:Y_(3)Al_(5)O_(12)(Ce:YAG)phosphor ceramics(PCs) high-power white light-emitting diodes or laser diodes(LEDs/LDs) luminous stability

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Laser induced broadband white emission of Y2Si2O7 nanocrystals

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Journal of Rare Earths 2019年第11期37卷 1196-1199页

作者： Robert Tomala Dariusz Hreniak wieslaw Strek Institute for Low Temperature and Structure Research Polish Academy of Sciences

The generation of broadband white emission of theα-Y2Si2O7 nanocrystals was observed upon excitation by focused beam ofCW lasers operating in near infrared,visible and blue *** influence of excitation energy on order of process is *** temperature of sample emitting laser induced white emission(LIWE)was determined by luminescence nanothermometry *** is found that the temperature is much lower than that predicted by blackbody model characterized with the same *** is shown that the LIWE is accompanied by efficient *** origin of white emission is discussed in terms of multiphoton ionization process leading to the inter valence charge transfer emission.

关键词： White light Photoconductivity Laser induced emission Nanocrystals

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Full Wavefield Analysis for Damage Assessment in Composite Materials

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 264-274页

作者： Tomasz Wandowski Pawel Malinowski wieslaw Ostachowicz Institute of Fluid Flow Machinery Polish Academy of Sciences

In this paper damage assessment based on guided elastic wave propagation phenomenon is *** waves are generated by piezoelectric transducer and registered by scanning laser doppler vibrometer(SLDV).Signal processing is based on the analysis of full wavefield measurements gathered from dense mesh of measurement points spanned over area of investigated *** wavefield measurement approach allows creation of animations presenting the guided wave propagation in the *** such approach is suitable for analysis of interaction of guided waves with discontinuities located in *** the research attention is paid especially on analysis of phenomenon of S0/A0′guided wave mode conversion due to interaction with investigated discontinuities-teflon inserts and impact *** presented work is related to glass fibre reinforced polymer(GFRP)*** the research,auxiliary non-destructive testing(NDT)method is also *** aim of this method is to indicate the depth of discontinuity,and to prove that delamination was created in the case of impact *** method is based on terahertz spectroscopy(THz)where the analysis of propagation of electromagnetic waves in the terahertz band is *** spectroscopy method can be utilized for damage assessment in the dielectric materials like GFRP.

关键词： damage assessment guided wave propagation (GW) mode conversion terahertz spectroscopy(THz)

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A Letter of Congratulations from Chairman wieslaw Klimczak of the Civil Association “Polish House” to President Zhou Tienong of CAFIU

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International Understanding 2011年第2期 17-18页

作者： wieslaw Klimczak Civil Association "Polish House"

Warsaw April 29,2011 Your Excellency ***, On behalf of the Civil Association 'Polish House',I would like to extend our sincere congratulations and best wishes to the participants of the 2nd Plenary Session of the 10th Executive Council of the Chinese Association for International Understanding(CAFIU) scheduled on April 29,*** Session,held at the 30th anniversary of CAFIU,is of special significance and far-reaching *** a Polish NGO enjoying sound cooperation

关键词：波兰协会公民中国科协铁委员会

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