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Passively Q-switched operation of a 1.94μm thulium-doped solid-state laser based on MXeneV_(2)CT_(x)

Chinese Optics Letters 2023年第2期21卷 40-44页

作者：袁晋鹤李佳睿吴政阳李双成韩杰李林军 College of Physical Science and Technology Heilongjiang UniversityHarbin 150080China Heilongjiang Provincial Key Laboratory of Laser Spectroscopy Technology and Application Harbin University of Science and TechnologyHarbin 150080China School of Data Science and Technology Heilongjiang UniversityHarbin 150080China

MXene V_(2)CT_(x) has great practicability because it is not easy to degrade under ambient conditions.In this paper,a V_(2)CT_(x) saturable absorber(SA)was firstly applied to a passively Q-switched(PQS)laser,to the best of our knowledge.The V_(2)CT_(x)-SA was prepared by the spin-coating method.The linear absorption of the V_(2)CT_(x)-SA in the 1000-2200 nm region and the nonlinear absorption near 2μm were studied.With the V_(2)CT_(x)-SA,a typical PQS operation at 1.94μm was realized in a Tm:YAlO3laser.The minimum pulse width produced by the PQS laser was 528 ns,and the peak power,repetition rate,and average output power were 10.06 W,65.9 kHz,and 350 mW,respectively.Meanwhile,the maximum pulse energy was 6.33μJ.This work demonstrates that the V_(2)CT_(x) can be used as an effective SA to obtain nanosecond pulses with high peak power and high repetition rate simultaneously.

关键词： passive Q-switching MXene V2CTx saturable absorber thulium doping

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Gain-switched watt-level thulium-doped fiber laser and amplifier operating at 1.7μm

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High Power Laser Science and Engineering 2022年第6期10卷 49-59页

作者： Yang Xiao Xusheng Xiao Lutao Liu Haitao Guo State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’anChina Center for Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina

A 1.7μm gain-switched thulium-doped all-fiber laser with a master oscillator power amplifier(MOPA)configuration,utilizing a bandpass fiber filter and a 1550 nm erbium/ytterbium-codoped fiber MOPA,is demonstrated.The influences of pump pulse parameters(repetition rate and pulse duration)and laser cavity structures(ring and linear)on the laser performances were experimentally investigated.To the best of our knowledge,the power quenching and drop were observed in the 1.7μm gain-switched thulium-doped fiber lasers for the first time,resulting from the mode-locked-resembling operation and nonlinear effects.Moreover,the fiber ring-cavity laser was more stable than the linear-cavity laser in the time domain and power.Finally,a laser with a maximum average power of 1.687 W,a slope efficiency of 19.7%,a single-pulse energy of 16.87μJ,a pulse width of 425 ns,a repetition rate of 100 kHz and a peak power of 39.69 W was obtained.

关键词： 1.7μm gain-switching fiber laser power roll-off thulium doping

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