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Judd-Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser

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Chinese Physics B 2009年第3期18卷 1009-1013页

作者：姚宝权郑亮亮杨晓涛王天衡段小明赵广军董勤 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology R&D Center for Laser and Opto-Electronic Materials Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

The Ho：YAP crystal is grown by the Czochralski technique. The room-temperature polarized absorption spectra of Ho：YAP crystal was measured on a c-cut sample with 1 at% holmium. According to the obtained Judd-Ofelt intensity parameters Ω2 = 1.42 × 10^-20cm^2, Ω4 = 2.92 ×10^-20 cm^2, and Ω6 =1.71 ×10^-20cm^2, this paper calculated the fluorescence lifetime to be 6 ms for ^5I7→^5Is transition, and the integrated emission cross section to be 2.24 × 10^-18 cm^2. It investigates the room-temperature Ho：YAP laser end-pumped by a 1.91-μm Tm：YLF laser. The maximum output power was 4.1 W when the incident 1.91-μm pump power was 14.4W. The slope efficiency is 40.8%, corresponding to an optical-to-optical conversion efficiency of 28.4%. The Ho：YAP output wavelength was centred at 2118 nm with full width at half maximum of about 0.8nm.

关键词： Ho:YAlO3 solid-state lasers Judd-Ofelt analysis Tm:YLF laser

An Easily Switchable Dual-Wavelength Passively Mode-Locked Erbium Fiber Laser

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Chinese Physics Letters 2014年第1期31卷 84-87页

作者：黄惠昌杨通袁晓志杨中民 state Key Laboratory Luminescent Materials and Devices and Institute of Optical Communication Materials South China University of Technology Ouangzhou 510640 Special Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong Province Guangzhou 510640

A simple scheme of switchable dual-wavelength passively mode-locked fiber laser is demonstrated. The laser can be flexibly switched among different mode-locked states simply by tuning the cavity loss while keeping all the other cavity parameters fixed. As the cavity loss increases, the mode-locked fiber laser operates at the long-wavelength, dual-wavelength, and short-wavelength states, successively. In addition, these states can be conveniently switched without losing the mode-locked operation and the switching process is reversible as the cavity loss decreases. The mechanism is qualitatively explained by the balance between the fiber gain and the cavity loss.

关键词： FIBER lasers FIBER optics solid-state lasers WAVELENGTHS ISOSBESTIC point

Judd-Ofelt analysis of spectra and experimental evaluation of laser performance of Tm^(3+) doped Lu_2SiO_5 crystal

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Chinese Physics B 2008年第10期17卷 3635-3639页

作者：姚宝权郑亮亮段小明赵广军宗艳花 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology R&D Center for Laser and Opto-Electronic Materials Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

This paper reports that the Tm^3＋：Lu2SiO5 （Tm：LSO） crystal is grown by Czochralski technique. The roomtemperature absorption spectra of Tm：LSO crystal are measured on a b-cut sample with 4 at.% thulium. According to the obtained Judd-Ofelt intensity parameters Ω2=9.3155×10^-20 cm^2, Ω4=8.4103×10^-20 cm^2, Ω6=1.5908×10^-20 cm^2, the fluorescence lifetime is calculated to be 2.03 ms for ^3F4 → ^3H6 transition, and the integrated emission cross section is 5.81×10^-18 cm^2. Room-temperature laser action near 2μm under diode pumping is experimentally evaluated in Tm：LSO. An optical-optical conversion efficiency of 9.1% and a slope efficiency of 16.2% are obtained with continuouswave maximum output power of 0.67 W. The emission wavelengths of Tm：LSO laser are centred around 2.06μm with spectral bandwidth of -13.6 nm.

关键词： Tm:Lu2SiO5 Judd-Ofelt analysis solid-state lasers diode-pumped

575-fs passively mode-locked Yb:CaF2 ceramic laser

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Chinese Physics B 2020年第7期29卷 326-330页

作者： Cong Wang Qian-Qian Hao Wei-Wei Li Hai-Jun Huang Shao-Zhao Wang Da-Peng Jiang Jie Liu Bing-Chu Mei Liang-Bi Su Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China state Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Science Wuhan University of TechnologyWuhan 430070China Synthetic Single Crystal Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China Key Laboratory of Transparent and Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China

A Yb-doped CaF2 transparent ceramics was successfully fabricated by the hot-pressed method and its laser characteristics were studied.A broad tuning performance and mode-locked laser operation were demonstrated in this ceramics for the first time,to our best knowledge.A 60-nm continuous-wavelength tunable laser from 1019 nm to 1079 nm was obtained with a birefringent *** employing a semiconductor saturable absorber mirror without additional dispersion compensation elements,a continuous-wave mode-locked laser with pulse duration as short as 575 fs was delivered,at a central wavelength of 1048.5 *** oscillator is operated under a repetition rate of 55 *** results indicate that the Yb:CaF2 transparent ceramics is an ideal candidate for the development of ultrafast lasers in the near-infrared regime.

关键词： mode-locking tunable transparent ceramics solid-state lasers

A High-Power Continuous-Wave Laser-Diode End-Pumped Nd：YVO4 Laser of Single-Frequency Operation

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Chinese Physics Letters 2005年第5期22卷 1144-1147页

作者：席文强赵晶云张宽收 stateKeyLaboratoryofQuantumOpticsandQuantumOpticsDevices InstituteofOpto-ElectronicsShanxiUniversityTaiyuan030006

We design and build a cw high quality and high power Nd:YVO4 laser of singlefrequency operation with a laser-diode dual-end-pumped geometry. The influence of the Nd3+-dopingconcentration in the Nd:YVO4 crystal on the output performance of laser is theoretically andexperimentally studied. With a Nd:YVO4 crystal of the Nd3+ -doping concentration 0.3 at.% and atpump power of 45 W, the output power of the single frequency laser is 18 W, and the slope efficiencyis 48%.

关键词： solid-state lasers DESIGN CRITERIA OPTIMIZATION OUTPUT NM

Reducing Thermal Effect in End-Diode-Pumped Laser Crystal by Using a Novel Resonator

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Chinese Physics Letters 2005年第3期22卷 607-610页

作者：姚爱云侯玮李惠清毕勇林学春耿爱丛孔宇鹏崔大复许祖彦 BeijingNationalLaboratoryforCondensedMatterPhysics InstituteofPhysicsGraduateSchooloftheChineseAcademyofSciencesBeijing100080

We report a new way, i.e. double-end-pumping, to extend the stability rangeof a laser resonator, in advantage of making the thermal loading be effectively divided between theends of the laser crystal to reduce the thermal effect, thus to extend the stability range. Usingthis new way, we experimentally obtained a 2.7-W cw laser source at 671 nm by intracavity frequencydoubling of 1342nm of a Nd:YVO4 laser based on the nonlinear crystal LiB3O5. The maximum pump poweris 28 W, which is higher than 13 W of the single-end-pumping.

关键词： solid-state lasers VARIABLE-CONFIGURATION RESONATOR DESIGN CRITERIA OPTIMIZATION RODS

Dynamics of Efficiency Change by Temperature in Diode Pumped Nd：YAG Heat Capacity Laser

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Chinese Physics Letters 2007年第7期24卷 1930-1933页

作者：壬小军唐兵束小建 Institute of Applied Physics and Computational Mathematics PO Box 8009-11 Beijing 100088

We investigate the influence of temperature on the efficiency of diode pumped Nd：YAG heat capacity laser is studied. It is shown that the efficiency of such a laser system is greatly reduced at higher temperature. This bad behaviour is mainly caused by the doped-ion redistribution among various Stark levels of the ground state, and by a thermal equilibrium between the upper laser level and the pump level. Meanwhile, the thermal excitations from the ground state to the lower laser level also play a role. We derive a model to describe those effects, with the considerations of emission spectrum of laser diodes, the subtle Stark structures and the linewidth of absorption and of simulated-emission.

关键词： solid-state lasers ABSORPTION

A Diode-Pumped 1617 nm Single Longitudinal Mode Er：YAG Laser with Intra-Cavity Etalons

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Chinese Physics Letters 2014年第7期31卷 93-95页

作者：邓云姚宝权鞠有伦段小明戴通宇王月珠 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin 150001

We demonstrate the continuous wave p-polarized single longitudinal mode （SLM） operation of an Er：YAG laser at 1617.6nm pumped by a diode-laser with three inserted Fabry-Perot （FP） etalons at room temperature. The Brewster angle inserted FP is applied to obtain the p-polarized laser. For free running, the maximum output power is 570 m W with a pump power of 12.5 W. An incident pump power of 12.5 W is used to generate the maximum p-polarized single longitudinal mode output power of 78.5 m W, corresponding to a slope efficiency of 1.6% and an optical-to-optical efficiency of 0.61%. The beam quality M2 is measured to be 1.15 at the highest SLM output power. This stable polarized SLM oscillation is encouraging due to its application for an injection-locked system used as a master laser.

关键词： solid-state lasers lasers -- Pumping FABRY-Perot interferometers TEMPERATURE effect OPTICAL properties

1.5-MHz repetition rate passively Q-switched Nd:YVO4 laser based on WS2 saturable absorber

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Chinese Physics B 2017年第4期26卷 202-206页

作者：王茜李璐李金萍王勇刚 state Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China

A transmission-type tungsten disulfide（WS_2）-based saturable absorber（SA） is fabricated and applied to passively Q-switched Nd：YVO_4 *** WS_2 nanosheets are deposited on a quartz substrate by the vertical evaporation *** inserting the WS2 SA into the plano-concave laser cavity,we achieve 153-ns pulses with an average output power of1.19 W at 1064 *** the best of our knowledge,both of them are the best results among those obtained by the Q-switched solid-state lasers with WS_2-based *** repetition rate ranges from 1.176 MHz to 1.578 *** far as we know,it is the first time that MHz level Q-switched pulses have been generated in all solid state lasers based on low-dimensional materials so far.

关键词： Q-switched lasers solid-state lasers nonlinear optical materials