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Influence of Nd^(3+) concentration on mid-infrared emission in PbF_(2) crystal co-doped with Ho^(3+) and Nd^(3+) ions

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Journal of Rare Earths 2024年第3期42卷 479-487,I0002页

作者： Yan Chen Juncheng Tan Peixiong Zhang Weibi Zheng Lin Li Lianhan Zhang Zhen Li Yin Hang Zhenqiang Chen Department of Optoelectronic Engineering Jinan UniversityGuangzhou510632China Guangdong Provincial Engineering Research Centerof Crystal and Laser Technology.Guangzhou 510632China Research Center of Laser Crystal Key Laboratory of High Power Laser MaterialsShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai201800China

A promising series of Ho_(y)Nd_(x)Pb_((1-x-y))F_2(x = 0, 0.01, 0.02, 0.03, 0.04;y = 0.02) crystals was grown by the Bridgman method. The influence of the Nd^(3+)ions concentration on mid-infrared(~2.0, ~2.9 and ~3.9 μm)fluorescence emissions of Ho^(3+)ions in the PbF_(2) crystal excited by 808 nm laser diode was investigated in this work. The energy transfer mechanism between Nd^(3+)ions and Ho~(3+)ions under different concentrations of the Nd^(3+)ions was systematically analyzed. The results show that the Nd^(3+)ions have good sensitization and deactivation effect on the Ho^(3+)ions to stimulate the mid-infrared fluorescence emissions. The experimental analysis proves that the sensitization efficiency of the Nd^(3+)ions is relatively stable at around 93.45% with varying Nd^(3+)-doping concentrations. Concentration dependence studies indicate that the concentration of the Nd^(3+)ions has significant influence on mid-infrared *** the doping concentration of the Nd^(3+)ions is up to 2.0 at%, the intensity of ~2.0, ~2.9 and ~3.9 μm emissions all reach the maximum. The output characteristics of a 3.9 μm laser are simulated, and it is found that with the increase of the Nd^(3+)-doping concentration, the peak power, pulse width, and peak energy all meet the trend of first increasing and then decreasing, and Ho_(0.02)Nd_(0.02)Pb_(0.96)F_(2) crystal displays the best performance. All the results show that the Nd^(3+)/Ho^(3+)co-doped PbF_(2) crystals might act as a useful optical medium for mid-infrared laser applications.

关键词： crystal growth Mid-infrared PbF_(2) Rare earth ions

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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”***,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 ***,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 *** 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 ***,the quantitative relations between phonon density distribution and laser wavelength extension are *** 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

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A 37 mJ,100 Hz,high energy single frequency oscillator

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Chinese Physics B 2021年第8期30卷 392-397页

作者： Yu Shen Yong Bo Nan Zong Shenjin Zhang Qinjun Peng Zuyan Xu Research Center for Laser Physics and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Solid State Laser Key Laboratory of Function Crystal and Laser TechnologyChinese Academy of SciencesBeijing 100190China

Ways on energy enhancement for single frequency oscillator are reported in this *** quantitative analysis on gain and loss coefficients for each cavity mode with inserted etalons,a 37 mJ,100 Hz high energy single-frequency Nd:YAG oscillator is *** pulse energy is promoted by enhancement of nearly 7 times for a single frequency oscillator *** result proves that this method does help for energy *** has attractive potential for high energy single frequency oscillator design,especially on condition of intensive side pumped or long cavity laser,where strong competitors exist and are hard to be suppressed.

关键词： Nd:YAG laser high pulse energy single frequency oscillator

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Pump pulse characteristics of quasi-continuous-wave diode-side-pumped Nd:YAG laser

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Chinese Physics B 2022年第5期31卷 355-359页

作者： Zexin Song Qi Bian Yu Shen Keling Gong Nan Zong Qingshuang Zong Yong Bo Qinjun Peng Key Laboratory of Solid State Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Function Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Southwest Institute of Technical Physics Chengdu 610041China

The influence of pumping laser pulse on the property of quasi-continuous-wave(QCW)diode-side-pumped Nd:YAG laser is investigated theoretically and *** remaining a fixed duty cycle,the average output power increases,and the corresponding thermal focal length shorten with the increase of the pump pulse duration,which attributes to the decrease of the ratio of pulse buildup time to the pulse *** a pump power of 146 W,the laser output power changes from 65.1 W to 81.2 W when the pulse duration is adjusted from 150μs to 1000μs,confirming a significant enhancement of 24.7%.A laser rate equation model incorporating the amplified spontaneous emission is also utilized and numerically solved,and the simulated results agree well with the experimental data.

关键词： pump pulse duration diode-side-pumped pulsed Nd:YAG laser laser rate equation amplified spontaneous emission

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Spin-orbit Rabi oscillations in optically synthesized magnetic fields

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Light(Science & Applications) 2023年第9期12卷 1930-1942页

作者： Guohua Liu Xiliang Zhang Xin Zhang 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

Rabi oscillation has been proven to be one of the cornerstones of quantum mechanics,triggering substantial investigations in different disciplines and various important applications both in the classical and quantum *** far,two independent classes of wave states in the Rabi oscillations have been revealed as spin waves and orbital waves,while a Rabi wave state simultaneously merging the spin and orbital angular momentum has remained *** we report on the experimental and theoretical observation and control of spin–orbit-coupled Rabi oscillations in the higher-order regime of *** constitute a pseudo spin-1/2 formalism and optically synthesize a magnetization vector through light-crystal *** observe simultaneous oscillations of these ingredients in weak and strong coupling regimes,which are effectively controlled by a beam-dependent synthetic magnetic *** introduce an electrically tunable platform,allowing fine control of transition between different oscillatory modes,resulting in an emission of orbital-angular-momentum beams with tunable topological *** results constitute a general framework to explore spin–orbit couplings in the higher-order regime,offering routes to manipulating the spin and orbital angular momentum in three and four *** close analogy with the Pauli equation in quantum mechanics,nonlinear optics,etc.,implies that the demonstrated concept can be readily generalized to different disciplines.

关键词： field orbital momentum

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High-power xenon lamp-pumped Er:YAP pulse laser operated in free-running and acousto-optical Q-switching modes

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Chinese Physics B 2023年第11期32卷 472-476页

作者：权聪孙敦陆张会丽罗建乔韩志远乔阳陈玙威王镇涛程毛杰张庆礼 Crystal Laboratory of Laser Technology Research Center Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Advanced Laser Technology Laboratory of Anhui Province National University of Defense TechnologyHefei 230037China Key Laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine MechanicsHefei 230031China Science Island Branch Graduate SchoolUniversity of Science and Technology of ChinaHefei 230026China

We demonstrate a high-energy and high-power pulse laser on a xenon lamp-pumped Er:YAP crystal. The laser performance and thermal focal lengths under different working frequencies are discussed. The results show that the thermal lens effect is gradually aggravated with the increase of working frequencies, and even working at 100 Hz, a single pulse energy of 234 m J can be achieved. A maximum average power of 41.5 W is achieved with a working frequency of 20 Hz and slope efficiency of 2.82%. This output power is much higher than other xenon lamp-pumped erbium laser devices.A Q-switched laser is demonstrated by using the TeO2crystal, the maximum output energies of 11.5 m J and 3.5 m J are obtained at 50 and 100 Hz, the corresponding peak powers are 93.4 k W and 17.2 kW, *** laser wavelengths and beam quality factors are also characterized in the free-running and Q-switched modes. A higher pulse energy and peak power laser could be achieved further by improving the damage threshold of TeO2acousto-optical Q-switching. All the experimental results illustrate that the xenon lamp-pumped Er:YAP laser is a promising candidate for high-power and high-frequency mid-infrared laser devices.

关键词： Er:YAP crystal xenon lamp-pumped mid-infrared laser acousto-optical Q-switching

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Photoreflectance system based on vacuum ultraviolet laser at 177.3 nm

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Chinese Physics B 2022年第11期31卷 100-105页

作者： Wei-Xia Luo Xue-Lu Liu Xiang-Dong Luo Feng Yang Shen-Jin Zhang Qin-Jun Peng Zu-Yan Xu Ping-Heng Tan State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences(CAS)Beijing 100083China Center of Materials Science and Optoelectronics Engineering&CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China Jiangsu Key Laboratory of ASIC Nantong UniversityNantong 226019China Key Laboratory of Solid State Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Function Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Photoreflectance(PR)spectroscopy is a powerful and non-destructive experimental technique to explore interband transitions of *** most PR systems,the photon energy of the pumping beam is usually chosen to be higher than the bandgap energy of the *** the best of our knowledge,the highest energy of pumping laser in reported PR systems is 5.08 eV(244 nm),not yet in the vacuum ultraviolet(VUV)*** this work,we report the design and construction of a PR system pumped by VUV laser of 7.0 eV(177.3 nm).At the same time,dual-modulated technique is applied and a dual channel lock-in-amplifier is integrated into the system for efficient PR *** system’s performance is verified by the PR spectroscopy measurement of well-studied semiconductors,which testifies its ability to probe critical-point energies of the electronic band in semiconductors from ultraviolet to near-infrared spectral region.

关键词： photoreflectance spectroscopy vacuum ultraviolet laser electronic band structure critical points of electron density of states

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Regulation of the sintering trajectory of Ho,Pr:Y_(2)O_(3) ceramics for 2.9μm mid-infrared lasers by atmospheric sintering

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Journal of Advanced Ceramics 2025年第1期14卷 81-89页

作者： Qing Li Fei Liang Jun Wang Yan Ling Xue Jie Ma Peng Liu Shiyu Sun Zhan Hui Jian Zhang Changhua Zhang Lili Hu Haohai Yu Huaijin Zhang Dingyuan Tang State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronics EngineeringEast China Normal UniversityShanghai 200241China Shanghai Branch Hefei National Laboratoryand Shanghai Research Center for Quantum SciencesShanghai 201315China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201899China Future Technology School Shenzhen Technology UniversityShenzhen 518118China

The sintering trajectory of the Ho,Pr:Y_(2)O_(3) ceramics could be effectively adjusted by sintering in a flowing oxygen atmosphere instead of *** final-stage grain growth was significantly suppressed by the use of oxygen atmosphere presintering,resulting in smaller average grain sizes than those of samples sintered under vacuum,while the same relative density was *** hot isostatic pressing(HIP),the oxygen presintered Ho,Pr:Y_(2)O_(3) ceramics achieved excellent optical quality,with transmittance exceeding 80%at a wavelength of 680 *** codoping of Pr^(3+) as deactivating ions effectively depopulated the lower energy level 5I7 during the Ho^(3+):^(5)I_(6)→^(5)I_(7) transition,thereby making the Ho,Pr:Y_(2)O_(3) ceramics more conducive to promoting population inversion in the 2.9μm laser wavelength range.

关键词： Y_(2)O_(3) ceramics sintering trajectory Ho^(3+)/Pr^(2+) mid-infrared laser fluorescence properties

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Theoretical and experimental studies on high-power laser-induced thermal blooming effect in chamber with different gases

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Chinese Physics B 2022年第8期31卷 530-535页

作者： Xiangyizheng Wu Jian Xu Keling Gong Chongfeng Shao Yang Kou Yuxuan Zhang Yong Bo Qinjun 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 University of Chinese Academy of Sciences Beijing 100190China

High-power laser induced thermal blooming effects in a closed chamber with three different gases are investigated theoretically and experimentally in this work. In the theoretical treatment, an incompressible gas turbulent model is *** the numerical simulation the gas refractive index as a function of both the temperature and pressure is taken into consideration. In the experimental study the pump-probe technology is adopted. A high-power 1064-nm fiber laser with maximum output power of 12 k W is used to drive the gas thermal blooming, and a 50-m W high-beam-quality 637-nm laser diode(LD)is used as a probe beam. The influences of the gas thermal blooming in the chamber on the probe beam wavefront and beam quality are analyzed for three different gases of air, nitrogen, and helium, respectively. The results indicate that nitrogen is well suitable for restraining thermal blooming effect for high-power laser. The measured data are in good agreement with the simulated results.

关键词： laser radiation numerical simulation propagation thermal blooming

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Barocaloric effect in ferroelastic Pb_(3)(VO_(4))_(2)

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Chinese Physics B 2025年第3期34卷 506-510页

作者： Pengtao Cheng Zuhua Chen Chengliang Zhang Zhengming Zhang Bing Li Dunhui Wang Hangzhou Dianzi University Hangzhou 310018China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser TechnologyKey Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

The barocaloric effect is considered as one of the most promising refrigeration with the potential to replace traditional gas compression *** of the main obstacles to the application of barocaloric materials lies in the requirement for high driving *** this paper,we report on the barocaloric effect of Pb_(3)(VO_(4))_(2),which exhibits a ferroelastic transition from a high-temperature trigonal structure to a low-temperature monoclinic structure at 357 K,accompanied by a substantial volume *** entropy change induced by hydrostatic pressure can reach up 14 J·kg^(-1)·K^(-1)under a relatively low pressure of 80 *** work is expected to expand the selection range of barocaloric materials.

关键词： solid-state refrigeration barocaloric effect ferroelastic transition

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