摘要
【目的】为实现2μm波段高性能超快光纤激光输出,文章提出了一种融合碳纳米管(CNT)可饱和吸收体与非线性放大环形镜(NALM)的混合锁模掺铥光纤激光器(TDFL)。【方法】通过数值求解耦合复金兹堡-朗道方程,系统研究了泵浦功率和CNT可饱和吸收体参数对超短脉冲输出特性的调控机制。【结果】结果表明,在8字形腔结构中,主环路和NALM环路的增益饱和能量分别通过增强自相位调制效应和优化非线性相移补偿显著影响了孤子脉宽、光谱带宽及能量特性。CNT的调制深度和非饱和损耗通过抑制非线性相移和触发耗散相变来调控光谱滤波效应和孤子能量。该混合锁模机制对泵浦功率波动和损耗扰动展现出强鲁棒性。【结论】文章为2μm波段高能量窄脉宽超快激光器的参数优化提供了理论依据。
【Objective】To achieve high⁃performance ultrafast fiber laser output in the 2μm wavelength band,this study demon⁃strates a Thulium Doped Fiber Laser(TDFL)employing a hybrid mode⁃locking scheme integrating Carbon Nanotube(CNT)and a Nonlinear Amplifying Loop Mirror(NALM).【Methods】Through numerical simulations of coupled complex Ginzburg⁃Landau equations,we systematically investigate the modulation mechanisms of pump power and CNT saturable absorber parame⁃ters on ultrashort pulse output characteristics.【Results】The results reveal that the gain saturation energies in the main loop and NALM loop of the figure⁃eight cavity structure significantly affect the soliton pulse width,spectral bandwidth,and energy by en⁃hancing the self⁃phase modulation effect and optimizing the nonlinear phase shift compensation,respectively.The modulation depth and non⁃saturation loss of CNT regulate the spectral filtering effect and soliton energy by suppressing nonlinear phase shift and triggering dissipative phase transition.The hybrid mode⁃locking mechanism demonstrates strong robustness against pump power fluctuations and loss perturbations.【Conclusion】This research provides theoretical support for parameter optimization of high⁃energy,narrow⁃pulse⁃width ultrashort pulse lasers in the 2μm wavelength band.
作者
刘青青
郑建城
LIU Qingqing;ZHENG Jiancheng(School of Overseas Education(School of Foreign Languages),College of Information Engineering,Sanming University,Sanming 365004,China;Fujian Key Lab of Agriculture IOT Application,College of Information Engineering,Sanming University,Sanming 365004,China)
出处
《光通信研究》
北大核心
2025年第6期156-167,共12页
Study on Optical Communications
基金
福建省自然科学基金资助项目(2024J08081)
福建省中青年教师教育科研资助项目(JAT231108)
三明学院引进高层次人才科研启动资助项目(23YG08)
三明学院高教研究课题资助项目(SHE2412)。
