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6th International Symposium on laser Interaction with Matter

作者： Yang, Tian-Li Yang, Jing Zhou, Wang-Zhe Wang, Xiao-Jun Liu, Bing-Jie Peng, Qin-Jun Key Lab of Solid State Laser Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Key Lab of Function Crystal and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Institute of Optical Physics and Engineering Technology Qilu Zhongke Jinan250000 China

ISBN: (纸本)9781510660236

Nanosecond (ns) pulsed laser with high average power and high pulse repetition rate above 50 kHz is a potential solution for laser cutting, laser welding, laser cleaning and many other industry processing scenarios. Although Nd:YAG is a widely used solid-state gain medium, it is difficult to obtain ns pulsed laser with repetition rate above 50 kHz due to its limited stimulated emission cross section and thermal distortion under high pump intensity. In this paper, a kilowatt-level 100 kHz high repetition rate ns Nd:YAG master oscillator power amplifier (MOPA) laser system is reported, and a general optimization method was used to obtain a 205 W seed laser with a high repetition rate of 100 kHz. After beam shaping elements, the seed laser was amplified to 1008 W by a two-rod Nd:YAG preamplifier and a two-rod Nd:YAG main amplifier. The pulse-to-pulse stability factor of the pulsed laser was 0.961 and the pulse width was measured as 142.8 ns. The beam parameter product in the horizontal axis and vertical axis were measured as BPPx = 2.81 mm∙mrad and BPPy = 2.78 mm∙mrad respectively. This is the first time to obtain a kilowatt-level average power ns pulsed laser with repetition rate above 50 kHz using Nd:YAG, and the compact MOPA system is also suitable for power scaling and other practical use. © 2022 SPIE.

关键词： Pulsed lasers

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Insertable monolithic ring cavity laser for high output power single-frequency operation 17

Insertable monolithic ring cavity laser for high output powe...

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17th National Conference on laser technology and Optoelectronics

作者： Liu, Hua-Yu Bian, Qi Bo, Yong Yuan, Lei Kou, Yang Liu, Yang Peng, Qin-Jun Key Lab of Solid State Laser Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Key Lab of Function Crystal and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Institute of Optical Physics and Engineering Technology Qilu Zhongke Jinan250000 China University of Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9781510661097

A novel insertable monolithic ring laser based on a Nd:YAG-YAG bonded crystal was proposed for high output power single-frequency operation. In a proof-of-principle experiment, the unidirectional resonator pumped by an 808 nm diode laser was constructed with a half-wave plate and a TGG etalon, thus achieving both structural stability and functional tunability. A single-frequency laser with the output power of 4.1 W is obtained at 1064 nm, corresponding to the slope efficiency of 17.7 % and an optical-to-optical efficiency of 11.8 %. The power fluctuation is measured to be within ±1% over 20 min. The average beam quality factor M2 is measured to be 2.07. © 2022 SPIE.

关键词： Yttrium aluminum garnet

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High-performance femtosecond-laser microfabricated lattice-like-cladding waveguides in Er³⁺ and MgO co-doped LiNbO₃ crystals for multi-wavelength guidance and luminescence

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Results in Physics 2024年 61卷

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 and College of EngineeringPhysics Shenzhen Technology University Shenzhen 518118 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

We report on microfabrication of the straight and S-shaped waveguides with lattice-like-cladding structures in Er3+ and MgO co-doped LiNbO3 by femtosecond laser writing. The waveguides with so-called Type II geometry ... 详细信息

We report on microfabrication of the straight and S-shaped waveguides with lattice-like-cladding structures in Er³⁺ and MgO co-doped LiNbO₃ by femtosecond laser writing. The waveguides with so-called Type II geometry support fundamental-mode propagation of light at near-infrared wavelength of 1550 nm and mid-infrared wavelength of 4 μm, which was experimentally and numerically investigated. In addition, it has been found that the guidance is only along the perpendicular (i.e., TE) polarization, which can be produced through controlling the femtosecond laser's parameters and direction. The green up-conversion at 550 nm under ⁴S_3/2 → ⁴I_15/2 transitions as well as the near-infrared luminescence at 1530 nm under ⁴I_13/2 → ⁴I_15/2 transition have been realized in the waveguides, and the resulting up-conversion luminescence efficiency was higher than Type I waveguides, which proved the Type II WGs can preserve and inspire the properties of the materials. © 2024 The Author(s)

关键词： Femtosecond laser microfabrication Green up-conversion Lithium niobate Multi-wavelength waveguide

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Photonic spin-orbit coupling induced by deep-subwavelength structured light

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Physical Review A 2024年第2期109卷 023522-023522页

作者： Xin Zhang Guohua Liu Yanwen Hu Haolin Lin Zepei Zeng Xiliang Zhang Zhen Li Zhenqiang Chen Shenhe Fu Department of Optoelectronic Engineering Jinan University Guangzhou 510632 China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou 510632 China Guangdong Provincial Engineering Research Center of Crystal and Laser Technology Guangzhou 510632 China

We demonstrate both theoretically and experimentally beam-dependent photonic spin-orbit coupling in a two-wave mixing process described by an equivalent of the Pauli equation in quantum mechanics. The considered structured light in the system is comprising a superposition of two orthogonal spin-orbit-coupled states defined as spin-up and -down equivalents. The spin-orbit coupling is manifested by prominent pseudospin precession as well as spin-transport-induced orbital angular momentum generation in a photonic crystal film of wavelength thickness. The coupling effect is significantly enhanced by using a deep-subwavelength carrier envelope, different from previous studies which depend on materials. The beam-dependent coupling effect can find intriguing applications; for instance, it is used in precisely measuring variation of light with spatial resolution up to 15 nm.

关键词： Angular momentum of light Spin-orbit coupling Structured light

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Simulation analyses and configuration optimizations of an LD pumped 3.1 µm Co/Er:PbF2 MIR laser

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Optik 2023年第1期290卷

作者： Tan, Juncheng Zheng, Weibi Zhang, Lianhan Li, Zhen Zhang, Peixiong Hang, Yin Chen, Zhenqiang Guangdong Provincial Engineering Research Center of Crystal and Laser Technology Guangdong Guangzhou510632 China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou510632 China Department of Optoelectronic Engineering Jinan University Guangzhou510632 China Research Center of Laser Crystal Key Laboratory of High Power Laser Materials Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China

The demand for mid-infrared physics technology is increasing, and it is still a difficult process from growing excellent laser crystals to performing laser experiments. In this paper, we consider the energy transfer process between Co2+ and Er3+, and present the theoretical simulation results of the output power of the 3.1 µm Co/Er:PbF2 MIR laser. Based on the setup of a LD pulse pumped laser system, the effects of beam waist radius, resonator parameters and crystal length on the output are discussed in detail. The calculation results show that under good cavity mirror conditions, we can obtain a 3.1 µm laser with an output slope efficiency of 43.4%, whose output energy reaches 2.19 mJ at an input of 5 mJ. This provides guidance include the cavity mirror parameters and crystal parameters for laser experiments. © 2023 Elsevier GmbH

关键词： Lead compounds

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Wide-wavelength-tunable operation of Tm:GYAP disordered crystal laser with birefringence filtering

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Optik 2024年 308卷

作者： Zhao, Zi-Wen Hu, Wen-Jie Zhu, Si-Qi Yin, Hao Li, Zhen Chen, Zhen-Qiang Guangdong Provincial Engineering Research Center of Crystal and Laser Technology Guangzhou510632 China Department of Optoelectronic Engineering Jinan University Guangzhou510632 China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Guangzhou510632 China

A disordered crystal of Tm:GYAP with a doping concentration of 5 at% was designed and grown. Test results show that the fluorescence spectral half-height width of this crystal is 203 nm, which implies that this crystal is capable of realizing a wide wavelength-tunable laser operation in the 2 µm band. In this study, the Tm:GYAP crystal based laser with a center wavelength of 1936.2 nm and a spectral width of 7.56 nm had been realized by using a compact straight cavity structure. Under a pumping of 8.55 W, a maximum output power of 0.841 W was obtained, and the corresponding optical-to-optical conversion efficiency and the slope efficiency were 9.8% and 12.7%, respectively. In addition, the wavelength-tunable laser operation of Tm:GYAP crystal was realized for the first time by inserting a birefringent filter. The tuning range of the output laser exceeded 120 nm (from 1911.8 nm to 2039.5 nm) even in the compact straight cavity. © 2024 Elsevier GmbH

关键词： lasers

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Coaxial Multi-Wavelength Generation in YVO4 crystal with Stimulated Raman Scattering Excited by a Picosecond-Pulsed 1064 laser

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Chinese Physics Letters 2020年第4期37卷 46-48页

作者： Jing-Jie Hao Wei Tu Nan Zong Yu Shensi Shen-Jin Zhang Yong Bo Qin-Jun Peng Zu-Yan Xu Key Lab of Solid State Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 Key Lab of Function Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100190

The multiwavelength characteristics of stimulated Raman scattering(SRS)in YVO4 crystal excited by a picosecond laser at 1064nm are investigated theoretically and *** output with seven wavelengths is achieved coaxially and synchronously at 894,972,1175,1312,1486,1713 and 2022 nm in a YVO4 *** maximum total Raman output energy is as high as 2.77mJ under the pump energy of 7.75mJ.A maximum total Raman conversion efficiency of 47.8%is obtained when the pump energy is 6.54 *** is the highest order of Stokes components and the highest output energy generated by YVO4 reported up to *** work expands the Raman spectrum of YVO4 crystal to the near-IR regime,with seven wavelengths covered at the same time,paving the way for new wavelength generation in the near-IR regime and its multiwavelength application.

关键词： pump scattering coaxial

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High-power wavelength-tunable and power-ratio-controllable dual-wavelength operation at 1319 nm and 1338 nm in a Q-switched Nd:YAG laser

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Photonics Research 2022年第10期10卷 2287-2292页

作者： QI BIAN YONG BO JUN-WEI ZUO LEI YUAN HONG-WEI GAO QIN-JUN PENG Key Laboratory of Solid State Laser 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

We report the first demonstration on three types of 1.3 μm spectral region in a Q-switched Nd:YAG laser. In order to dissipate the heat deposition effectively to obtain good beam quality, the Nd:YAG rod crystal with 1° cut-angle on end faces is side-pumped by the quasi-continuous-wave pulsed laser diode. A Suprasil etalon is well designed as the intracavity mode-selector to obtain wavelength-tunable single line or power-ratio-controllable dual line operation at1319 nm and 1338 nm. With the pump pulse width of 200 μs and pump power of 410 W, the acousto-optic Q-switched laser delivered a pulse width of 117 ns at 400 Hz repetition rate, and the M2factor was measured to be about 1.87. 1319 nm together with 1338 nm single-wavelength laser achieved an average output power of 47.6 W and 39.9 W with a linewidth of 0.48 nm and 0.32 nm, and a tunable range of 111.2 pm and108.6 pm, respectively. Among dual-wavelength oscillation, both lines can be tuned at almost equal intensity level with 45.7 W total output power, which is input into an LBO crystal to generate red light of 11.4 W for 659 nm,6.7 W for 664 nm, and 7.5 W for 669 nm. The 1.3 μm wavelength-selectable operation realized by using the same laser configuration may enhance the application in the fields of tunable lasers and THz frequency generation.

关键词： Nd:YAG switched tunable

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Widely tunable continuous-wave visible and mid-infrared light generation based on a dual-wavelength switchable and tunable random Raman fiber laser

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Photonics Research 2023年第5期11卷 808-816页

作者： HAN WU WEIZHE WANG BO HU YANG LI KAN TIAN RUI MA CHUNXIAO LI JUN LIU JIYONG YAO HOUKUN LIANG College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser TechnologyTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nonlinear frequency conversion of wavelength agile and high-power random fiber lasers can provide a promising way to generate continuous-wave(CW)visible and mid-infrared(MIR)light with unique properties such as the continuous modeless spectrum,low temporal/spatial coherence,and high temporal ***,we report a dual-wavelength switchable and tunable random Raman fiber laser(RRFL)based on a phosphosilicate fiber that has two Raman gain peaks for the first time and demonstrate its superior capability to generate widely tunable CW visible and mid-infrared light via nonlinear frequency *** using the combination of a tunable pump and two tunable gratings in Littrow configuration that can provide separated point feedback for the two Stokes wavelengths corresponding to silica-and phosphorus-related Raman peaks,the spectrum of an RRFL can be flexibly manipulated for the aim of nonlinear frequency conversions,including single-wavelength tunable emission at the 1.1μm or 1.2μm band for second-harmonic generation(SHG),dual-wavelength simultaneously tunable emission at the 1.1μm and 1.2μm bands for the sum-frequency generation(SFG),and dual-wavelength separation tunable emission for difference-frequency generation(DFG).As a result,with the combination of SHG and SFG in a periodically poled lithium niobate crystal array,we experimentally demonstrate the broadest tuning range(560-630 nm)of visible light generated from an RRFL,to the best of our *** tunable MIR light in the range of 10.7-12.3μm is also demonstrated through DFG of an RRFL operating in separation tunable dual-wavelength emission mode in a Ba Ga4Se7(BGSe)crystal,which is the first realization of>10μm CW DFG in the BGSe *** believe the developed dual-wavelength switchable and tunable RRFL can provide a new compact,robust,and cost-effective platform to realize broadly tunable light in both the visible and MIR regions,which can also find potential applications in imaging,sensing,and tem

关键词： tunable fiber tuning

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Generation of high-repetition-rate, high-power, few-cycle, 2-µm laser pulses with a single-stage all-fiber nonlinear compressor

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Optics letters 2025年第12期50卷 3852-3855页

作者： Zhen Yuan Kejian Yang Yang Li Jingjie Hao Heyan Liu Zhongben Pan Jinwei Zhang Yizhou Liu Tianli Feng Key Laboratory of Laser & Infrared System Ministry of Education School of Information Science and Engineering Shandong University Qingdao 266237 China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China yizhou.liu@***

We demonstrate a high-repetition-rate, high-power, few-cycle 2-µm laser employing a single-stage, all-fiber nonlinear pulse compressor. The compressor consists of three cascaded dispersion-compensating fibers that are spliced, with group velocity dispersions of -0.095 ps/m, 0.137 ps/m, and -0.076 ps/m, respectively. The splicing losses caused by the different mode-field diameters were carefully minimized to 0.8 dB and 0.23 dB. A home-built 51.6-MHz, 8.26-W, 578-fs Tm-doped laser was used as the driving laser. This nonlinear fiber compressor realized a compression ratio of 17, reducing the pulse duration to 34 fs, based on the Gaussian assumption. The interaction between the accumulated nonlinear phase and dispersion was analyzed to optimize the characteristics of the compressed pulse. Consequently, laser pulses with 4.4-W average power and a 34-fs duration were generated.

关键词： laser sources Nonlinear optical fibers Nonlinear parametric processes Raman scattering Thulium doped fiber lasers Thulium-doped fiber amplifiers

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