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continuous-waveπ-polarized 1084 nm laser based on Nd:MgO:LiNbO_(3)under 888 nm thermally boosted pumping

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Chinese Optics Letters 2022年第12期20卷 32-37页

作者： Rui Zhao Xiaotian Lei Xiaodai Yao Yue Lu Yongji Yu Guangyong Jin Jilin Key Laboratory of Solid-State laser Technology and Application Changchun University of Science and TechnologyChangchun 130022China

A continuous-wave(CW)π-polarized 1084 nm laser based on Nd:MgO:LiNbO_(3)under 888 nm thermally boosted pumping is *** to the absorption spectrum and energy level structure of Nd:MgO:LiNbO_(3),the 888 nm laser diode(LD)is used for thermally boosted *** pumping method eliminates the quantum defect caused by the nonradiative transition in Nd:MgO:LiNbO_(3)under the traditional 813 nm pumping and effectively improves the serious thermal effect of the *** unmatched polarized 1093 nm laser is completely suppressed,and theπ-polarized laser output of1084 nm in the whole pump range is realized by the 888 nm thermally boosted *** the present work,we achieved the CWπ-polarized 1084 nm laser with a maximum output power of 7.53 W and a slope efficiency of about 46.1%.

关键词： continuous-wave laser -polarization Nd:Mgo:LiNbO_(3) thermally boosted pumping

laser ablation mechanism and performance of glass fiber-reinforced phenolic composites:An experimental study and dual-scale modelling

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Chinese Journal of Aeronautics 2024年第8期37卷 470-485页

作者： Ran BI Pengfei SHEN Longyu ZHU Zhengzheng MA Chuyang LUO Yongfeng LI Lijian PAN Shanghai Key Laboratory of Lightweight Composite Donghua UniversityShanghai 201620China Shanghai High Performance Fibers and Composites Center(Province-Ministry Joint) Center for Civil Aviation CompositesDonghua UniversityShanghai 201620China AVIC Composite Corporation Ltd Beijing 101300China

Both experimental and simulation approaches were employed to investigate the laser ablation mechanism and performances of Glass Fiber Reinforced Phenolic Composites(GFRP).During the ablation process,the difference in thermal conductivities of the glass fibers and the resin matrix as well as their discrepant physical and chemical reactions form a conical ablation *** formation of a residual carbon layer effectively mitigates the ablation rate in the thickness direction.A higher power density results in a faster ablation rate,while a longer irradiation time leads to a larger ablation pit *** account for the variation in thermal conductivity between the fiber and resin,a macro-mesoscale model was developed to differentiate the matrix from the fiber *** element analysis revealed that laser irradiation leads to phenolic decomposition,glass fiber melting vaporization,and residual carbon skeleton *** dual-scale model exhibits precise prediction capabilities concerning the laser ablation process of GFRP,and its accuracy is confirmed through the comparison of simulation and experimental results for the GFRP laser ablation *** model provides a feasible method for performance evaluation and lifetime prediction of GFRP subjected to continuous wave laser irradiation.

关键词： Polymer-matrix composites continuous-wave laser Microstructural analysis Ablation mechanism Finite element method

Influence of fluorescence time characteristics on the spatial resolution of CW-stimulated emission depletion microscopy

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Chinese Physics B 2018年第3期27卷 456-463页

作者： Haiyun Qin Wei Zhao Chen Zhang Yong Liu Guiren Wang Kaige Wang Institute of Photonics and Photon-Technology Northwest UniversityXi'an 710069China School of Electronics and Information Engineering Shanghai University of Electric PowerShanghai 200090China Mechanical Engineering Department&Biomedical Engineering Program University of South CarolinaColumbiaSC 29208USA

As one of the most important realizations of stimulated emission depletion(STED)microscopy,the continuous-wave(CW)STED system,constructed by using CW lasers as the excitation and STED beams,has been investigated and developed for nearly a ***,a theoretical model of the suppression factors in CW STED has not been well *** this investigation,the factors that affect the spatial resolution of a CW STED system are theoretically and numerically *** full-width-at-half-maximum(FWHM)of a CW STED with a doughnut-shaped STED beam is also *** is found that the suppression function is dominated by the ratio of the local STED and excitation beam *** addition,the FWHM is highly sensitive to both the fluorescence rate(inverse of fluoresce lifetime)and the quenching rate,but insensitive to the rate of vibrational *** comparison,the suppression function in picosecond STED is only determined by the distribution of the STED beam intensity scaled with the saturation *** model is highly consistent with published experimental data for evaluating the spatial *** investigation is important in guiding the development of new CW STED systems.

关键词： stimulated emission depletion continuous-wave laser suppression function numerical simulation

Effects of pulse width and repetition rate of pulsed laser on kinetics and production of singlet oxygen luminescence

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Journal of Innovative Optical Health Sciences 2016年第6期9卷 26-34页

作者： Defu Chen Ying Wang Buhong Li Huiyun Lin Xuechun Lin Ying Gu School of Information and Electronics Beijing Institute of Technology Beijing 100081P.R.China Department of laser Medicine Chinese People's Liberation Army General Hospital Beijing 100853 P.R.China Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education Fujian Normal University Fujian 350007P.R.China Fujian Provincial Key Laboratory for Photonics Technology Fujian Normal University Fujian 350007P.R.China Laboratory of All-Solid-State Light Sources Institute of Semiconductors Chinese Academy of Sciences Beijing 100083P.R.China

Pulsed and continuous-wave(CW)lasers have been widely used as the light sources for photodynamic therapy(PDT)*** oxygen(^(1)O_(2))is known to be a major cytotoxic agent in type-II PDT and can be directly detected by its near-infrared luminescence at 1270 *** compared to CW laser excitation,the effiects of pulse width and repetition rate of pulsed laser on the kinetics and production of^(1)O_(2)luminescence were quantitatively studied during photosensitization of Rose *** di®erence in kinetics of^(1)O_(2)luminescence was found under the excitation with various pulse widths of nanosecond,microsecond and CW irradiation with power of *** peak intensity and duration of^(1)O_(2)production varied with the pulse widths for pulsed laser excitation,while the^(1)O_(2)was generated continuously and its production reached a steady state with CW ***,no significant di®erence(P>0:05)in integral^(1)O_(2)production was *** results suggest that the PDT efficacy using pulsed laser may be identical to the CW laser with the same wavelength and the same average°uence rate below a threshold in solution.

关键词： Photodynamic therapy pulsed laser continuous-wave laser singlet oxygen luminescence

continuous-wave optical enhancement cavity with 30-kW average power

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Chinese Physics B 2023年第3期32卷 258-261页

作者：柳兴陆心怡王焕颜立新李任恺黄文会唐传祥 Ronic Chiche Fabian Zomer Department of Engineering Physics Tsinghua UniversityBeijing 100084China UniversitéParis-Saclay CNRS/IN3 P3IJCLab91405 OrsayFrance

Optical enhancement cavity(OEC)is a powerful tool for fundamental research and *** this paper,the progress of a continuous-wave OEC to realize of megawatt cavity for a novel light source based on a steady-state microbunching(SSMB)mechanism,is *** efficiently suppressing all external noise and optimizing the alignment,mode-matching,and polarization matching,stable and long-term locking is achieved with the help of two feedback *** modal instability phenomenon caused by the surface thermoelastic deformation is observed.A pair of D-shape mirrors are utilized to remove the high-order ***,an intra-cavity average power of 30 kW is reached.

关键词： optical enhancement cavity continuous-wave laser modal instability high power cavity