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High-energy, high-peak-power, sub-nanosecond, spatial super-Gaussian 177 nm vacuum ultraviolet laser

High Power laser Science and Engineering 2024年第6期12卷 65-70页

作者： Ning Wen Tian-Hao Lv Nan Zong Hong-Wei Gao Yong Bo Qin-Jun Peng Da-Fu Cui Zu-Yan Xu Xiao-Yang Wang Li-Juan Liu Ru-Kang Li Nan Wang Xue-Chun Lin Key Laboratory of Solid-State Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina Key Laboratory of Functional Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina Laboratory of All-Solid-State Light Source Institute of SemiconductorsChinese Academy of SciencesBeijingChina Institute of Optical Physics and Engineering Technology Qilu ZhongkeJinanChina University of Chinese Academy of Sciences BeijingChina

A high-energy pulsed vacuum ultraviolet(VUV) solid-state laser at 177 nm with high peak power by the sixth harmonic of a neodymium-doped yttrium aluminum garnet(Nd:YAG) amplifier in a KBe_(2)BO_(3)F_(2) prism-coupled device was demonstrated. The ultraviolet(UV) pump laser is a 352 ps pulsed, spatial top-hat super-Gaussian beam at 355 nm.A high energy of a 7.12 mJ VUV laser at 177 nm is obtained with a pulse width of 255 ps, indicating a peak power of 28 MW, and the conversion efficiency is 9.42% from 355 to 177 nm. The measured results fitted well with the theoretical prediction. It is the highest pulse energy and highest peak power ever reported in the VUV range for any solid-state *** high-energy, high-peak-power, and high-spatial-uniformity VUV laser is of great interest for ultra-fine machining and particle-size measurements using UV in-line Fraunhofer holography diagnostics.

关键词： high pulse energy KBe_(2)BO_(3)F_(2)prism-coupled device spatial super-Gaussian beam vacuum ultraviolet

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A 45-μJ,10-kHz,burst-mode picosecond optical parametric oscillator synchronously pumped at a second harmonic cavity

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Chinese Physics B 2022年第8期31卷 424-428页

作者： Chao Ma Ke Liu Yong Bo Zhi-Min Wang Da-Fu Cui Qin-Jun Peng Key Laboratory of Solid-State Lasers Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Functional Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Institute of Optical Physics and Engineering Technology Qilu ZhongkeJinan 250000China University of Chinese Academy of Sciences Beijing 100190China

A novel high-energy picosecond optical parametric oscillator(OPO)was realized by placing an OPO in a secondharmonic(SH)*** a proof-of-principle experiment,we demonstrated excellent burst energy of 45μJ for the OPO signal at 900 nm that operates at a pulse repetition rate of 10 k Hz and a pulse width of 46.8 *** beam quality was measured as M_(x)^(2)=1.44 and M_(y)^(2)=1.40 in the orthogonal directions,corresponding to an average beam factor M^(2)=*** far,this study is the first to investigate high-energy ps OPO synchronously pumped in a second-harmonic cavity.

关键词： ultrafast laser synchronously pumped optical parametric oscillator high energy

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Short mid-infrared watt-level all-fiber nonlinear pulse compressor above 100-MHz pulse repetition rate

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High Power laser Science and Engineering 2023年第1期11卷 107-113页

作者： Jingcheng Shang Chao Mei Shengzhi Zhao Yizhou Liu Kejian Yang Chun Wang Tao Li Tianli Feng School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and ApplicationShandong UniversityQingdaoChina Key Laboratory of Laser&Infrared System(Shandong University) Ministry of EducationQingdaoChina Institute of Novel Semiconductors State Key Laboratory of Crystal MaterialsShandong UniversityJinanChina Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services SCCEUniversity of Science and Technology BeijingBeijingChina

We firstly report a 2-μm all-fiber nonlinear pulse compressor based on two pieces of normal dispersion fiber(NDF),which enables a high-power scaling ability of watt-level and a high pulse compression ratio of *** the NDFbased all-fiber nonlinear pulse compressor,the 450-fs laser pulses with a repetition rate of 101.4 MHz are compressed to 35.1 fs,corresponding to a 5.2 optical oscillation cycle at the 2-μm wavelength *** output average power reaches 1.28 W,which is believed to be the highest value never achieved from the previous 2-μm all-fiber nonlinear pulse compressors with a high pulse repetition rate above 100 *** dynamic evolution of the ultrafast pulse inside the all-fiber nonlinear pulse compressor is numerically analyzed,matching well with the experimental results.

关键词： few-optical-cycle pulses high pulse repetition rate nonlinear pulse compression

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Optical edge-to-screw singularity state conversions

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Photonics Research 2024年第8期12卷 1689-1695页

作者： HAOLIN LIN JUNHUI JIA GUOHUA LIU YANWEN HU ZHEN LI ZHENQIANG CHEN SHENHE FU Department of Optoelectronic Engineering Jinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632China Guangdong Provincial Engineering Research Center of Crystal and Laser Technology Guangzhou 510632China

Optical singularity states,which significantly affect propagation properties of light in free space or optical medium,can be geometrically classified into screw and edge *** different types of singularity states do not exhibit direct connection,being decoupled from each other in the absence of external *** we demonstrate a novel optical process in which a higher-order edge singularity state initially nested in the propagating Gaussian light field gradually involves into a screw singularity with a new-born topological charge determined by order of the edge *** considered edge state comprises an equal superposition of oppositely charged vortex and antivortex *** theoretically and experimentally realize this edge-to-screw conversion process by introducing intrinsic vortex–antivortex *** also present a geometrical representation for mapping this dynamical process,based on the higher-order orbital Poincaré*** this framework,the edge-to-screw conversion is explained by a mapping of state evolution from the equator to the north or south pole of the Poincaré*** demonstration provides a novel approach for manipulating singularity state by the intrinsic vortex–antivortex *** presented phenomenon can be also generalized to other wave systems such as matter wave,water wave,and acoustic wave.

关键词： interaction Poincaré wave

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Unexpected giant negative area compressibility in palladium diselenide

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National Science Review 2023年第9期10卷 146-153页

作者： Xingxing Jiang Shengzi Zhang Dequan Jiang Yonggang Wang Maxim S.Molokeev Naizheng Wang Youquan Liu Xingyu Zhang Zheshuai Lin New Functional Crystals Group Key Laboratory of Functional Crystals and Laser TechnologyTechnical Institute of Physics and ChemistryChinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences University of Chinese Academy of Sciences Center for High Pressure Science &Technology Advanced Research School of Materials Science and Engineering Peking University Laboratory of Crystal Physics Kirensky Institute of PhysicsSB RAS Department of Physics Far Eastern State Transport University International Research Center of Spectroscopy and Quantum Chemistry Siberian Federal University

Negative area compressibility（NAC） is a counterintuitive 'squeeze-expand' behavior in solids that is very rare but attractive due to possible pressure-response applications and coupling with rich physicochemical ***,NAC behavior is reported in palladium diselenide with a large magnitude and wide pressure *** discover that,apart from the rigid flattening of layers that has been generally recognized,the unexpected giant NAC effect in PdSe2largely comes from anomalous elongation of intralayer chemical *** structural variations are driven by intralayer-to-interlayer charge transfer with enhanced interlayer interactions under *** work updates the mechanical understanding of this anomaly and establishes a new guideline to explore novel compression-induced properties.

关键词： negative area compressibility Lifshitz mechanism charge transfer

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High-Performance Femtosecond-laser Microfabricated Waveguides in Er3+ and Mgo Co-Doped Linbo3 crystals for Mid- and Near-Infrared Spectral Regimes

SSRN

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SSRN 2024年

作者： Lv, Jinman Li, Ge Duan, Yumeng Zheng, Xinzhi Ma, Yujie Chen, Feng Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser Application Technology College of EngineeringPhysics Shenzhen Technology University Shenzhen518118 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan250100 China

Mid- and near-infrared light propagation are achieved with lattice-like-cladding waveguides in Er3+ and MgO co-doped LiNbO3 microfabricated by femtosecond laser writing. The transmission performance of the fundamental mode in so fabricated straight and curved Type II waveguides at both the mid-infrared and telecommunication wavelengths are experimentally and numerically investigated. It is shown that polarization can be produced by laser-written Type II waveguides through controlling the femtosecond laser’s parameters and direction. It is also shown that green up-conversion luminescence of 4S3/2→4I15/2 can be realized by using a 980 nm pump laser, and the resulting fluorescence efficiency can be higher than that from other methods. © 2024, The Authors. All rights reserved.

关键词： Femtosecond lasers

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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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Large low-field reversible magnetocaloric effect in K_(3)Gd(PO_(4))_(2) at sub-Kelvin temperature

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Journal of Rare Earths 2024年第6期42卷 1087-1092,I0003页

作者： Haojie Wang Zhaojun Mo Jianjian Gong Heng Tu Guochun Zhang Jun Shen School of Rare Earths University of Science and Technology of ChinaHefei230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341119China Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser TechnologyKey Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China Department of Energy and PowerEngineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China

We synthesized a potassium gadolinium phosphate K3Gd(PO_(4))_(2)with monoclinic structure(P2_(1/m))by the high-temperature solid-state reaction *** lattice constants obtained by Rietveld refinements of XRD curve are a=0.7411 nm,b=0.5624 nm,and c=0.9433 *** and magnetocaloric properties of K_(3)Gd(PO_(4))_(2)were investigated in *** magnetic phase transition temperature of K3Gd(PO_(4))2 was determined by ultra-low temperature testing to be 0.58 K.K_(3)Gd(PO_(4))2 exhibits large magnetic entropy changes(-ΔSM).The maximum-ΔSM are 20.2 and 29.4 J/(kg·K)in the magnetic field variation(ΔH)of 1 and 2 T,respectively,which are larger than that of the commercial Gd_(3)Ga_(5)O_(12)(GGG).The maximum adiabatic temperature change(ΔT_(ad))reaches 5.91 K under a magnetic field change(ΔH)of 1 T.K_(3)Gd(PO_(4))_(2)is a potential magnetic refrigeration material for obtaining sub-Kelvin temperatures.

关键词： Ultra-low temperature Magnetocaloric effect Magnetic entropy change Magnetic refrigeration Rare earths

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Electro-optically cavity-dumped Ho:YAG laser with wavelengths switching between 2090nm and 2122nm

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Optics Communications 2025年 591卷

作者： Chen, Na Li, Zhen-Ling Zhang, Jing-Ya Zhang, Ao-Nan Liu, Ke Kou, Yang Wang, Xiao-Jun Key Laboratory of Solid State Laser Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Key Laboratory of Functional Crystal and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100190 China

A wavelength switchable cavity dumped nanosecond (ns) Ho:YAG laser is demonstrated. A rubidium titanyl phosphate (RTP) electro-optic cell is combined with a thin film polarizer (TFP) for cavity dumping operating at 10 kHz repetition rate. By finely rotating the TFP, the intracavity loss for different wavelength peak around 2.1 μm is accurately controlled, and the laser can be selectively operated at 2090.31 nm and 2122.41 nm, respectively. The output characteristics are almost similar for both of the two wavelengths. The pulse width is kept at approximately 4.5 ns. When the incident pump power is 21.8 W, the maximum average output power of 7.3 W is achieved, corresponding to a maximum pulse energy of 0.73 mJ. © 2025 Elsevier B.V.

关键词： Optical pumping

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High-energy,hundred-picosecond pulsed 266 nm mid-ultraviolet generation by a barium borate crystal

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High Power laser Science and Engineering 2023年第2期11卷 127-131页

作者： Ning Wen Nan Wang Nan Zong Xue-Chun Lin Hong-Wei Gao Yong Bo Qin-Jun Peng Da-Fu Cui Zu-Yan Xu Key Laboratory of Functional Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina Laboratory of All-Solid-State Light Source Institute of SemiconductorsChinese Academy of SciencesBeijingChina Key Laboratory of Solid-State Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina Institute of Optical Physics and Engineering Technology Qilu ZhongkeJinanChina University of Chinese Academy of Sciences BeijingChina

We present a high-energy,hundred-picosecond(ps)pulsed mid-ultraviolet solid-state laser at 266 nm by a direct second harmonic generation(SHG)in a barium borate(BaB_(2)O_(4),BBO)nonlinear *** green pump source is a 710 mJ,330 ps pulsed laser at a wavelength of 532 nm with a repetition rate of 1 *** a green pump energy of 710 mJ,a maximum output energy of 253.3 mJ at 266 nm is achieved with 250 ps pulse duration resulting in a peak power of more than 1 GW,corresponding to an SHG conversion efficiency of 35.7%from 532 to 266 *** experimental data were well consistent with the theoretical *** the best of our knowledge,this laser exhibits both the highest output energy and highest peak power ever achieved in a hundred-ps/ps regime at 266 nm for BBO-SHG.

关键词： all-solid-state laser hundred-picosecond pulse mid-ultraviolet high-energy laser

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