2.8μm Er:ZBLAN光纤孤子自压缩放大器  

2.8-μm Er:ZBLAN Fiber Soliton Self-Compression Amplifier

作　　者：周亦诚 覃治鹏 谢国强 Zhou Yicheng;Qin Zhipeng;Xie Guoqiang(School of Physics and Astronomy,Key Laboratory for Laser Plasmas(Ministry of Education),Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Center of IFSA(CICIFSA),Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学物理与天文学院激光等离子体教育部重点实验室,上海200240 [2]上海交通大学IFSA协同创新中心,上海200240

出　　处：《中国激光》2022年第1期122-128,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(62075126,62005161,91850203);上海市“晨光计划”(19CG12)。

摘　　要：理论和实验研究了一种2.8μm Er:ZBLAN光纤孤子自压缩放大器。放大器采用锁模Er:ZBLAN光纤振荡器作为种子源,锁模脉冲宽度为240fs,峰值功率为16.9kW,重复频率为54.3 MHz。通过单级孤子自压缩放大,实验获得了脉冲宽度为110fs、峰值功率达151kW的中红外飞秒脉冲输出。Objective Mid-infrared(2-20μm)laser has a broad prospect in the applications including molecule spectroscopy,material processing,biomedicine,and basic physics research.Mode-locked all-solid-state laser,optical parametric oscillator or amplifier,and mode-locked fiber laser are some general methods for generating mid-infrared ultrafast laser.In the generation of this laser,the mode-locked fiber laser stands out owing to its advantages of flexible structure,fast heat dissipation,and good beam quality.Currently,diode-pumped Er:ZBLAN fiber has been widely investigated at 2.8μm because of its high gain and efficiency.Researchers from Laval University have realized femtosecond mode-locked pulses at 2.8μm using a nonlinear polarization rotation technique,with a pulse width of207 fs and a peak power of 3.5 kW.However,owing to the high nonlinearity of single-mode fiber and the large anomalous dispersion of ZBLAN fiber at 2.8μm,the intracavity soliton tends to split at a low peak power.It is an efficient way to amplify the mode-locked pulses to obtain higher pulse energy and peak power.In this study,we reported a 2.8-μm Er:ZBLAN fiber soliton self-compression amplifier with a pulse width of 110 fs and a peak power of 151 kW.Methods Based on a generalized nonlinear Schr?dinger equation,we numerically simulated the pulse evolution in the fiber amplifier.Influence of the saturation energy on the output pulses was investigated.The pulse evolution process in the fiber was used to explain the soliton-self-compression phenomenon in detail(Fig.1).Guided by the simulated results,we constructed a 2.8-μm Er:ZBLAN fiber amplifier,seeded by a nonlinear polarization rotation(NPR)mode-locked Er:ZBLAN fiber laser(Fig.2).The amplified pulses were characterized using a mid-infrared spectrometer(Ocean Optics,SIR5000)and intensity autocorrelator(APE,PulseCheck 150)under different incident pump powers.Results and Discussions Fig.1 shows the numerical simulation results.The pulse width of the seed pulse is 240 fs,and the peak power is 3.1

关 键 词：激光器 超快激光器 锁模激光器 激光放大器 红外和远红外激光器 

分 类 号：TN248.1[电子电信—物理电子学]