基于碳化钛的亮暗脉冲可切换锁模光纤激光器  

Light/Dark⁃Pulsed Switching Mode⁃Locked Fiber Laser Based on Ti_(3)C_(2)T_(x)

作　　者：陆天一 常建华[1,2,3] 戴腾飞 苏友朋 崔致远 涂倩 朱云瀚 Lu Tianyi;Chang Jianhua;Dai Tengfei;Su Youpeng;Cui Zhiyuan;Tu Qian;Zhu Yunhan(TianChang Research Institute,Nanjing University of Information Science and Technology,Chuzhou 239300,Anhui,China;School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China;Jiangsu Provincial Collaborative Innovation Center for Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]南京信息工程大学天长研究院,安徽滁州239300 [2]南京信息工程大学电子与信息工程学院,江苏南京210044 [3]南京信息工程大学江苏省大气环境与装备技术协同创新中心,江苏南京210044

出　　处：《中国激光》2024年第14期18-25,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(62175114,62375137)。

摘　　要：提出了一种基于碳化钛(Ti_(3)C_(2)T_(x))的亮暗脉冲可切换锁模光纤激光器。基于光沉积法将制备的Ti_(3)C_(2)T_(x)附着于腐蚀光纤表面,利用光纤倏逝波耦合效应提高光与Ti_(3)C_(2)T_(x)材料的相互作用。将该器件置于掺铒光纤激光器腔内,当泵浦功率为110.2 mW时,获得了中心波长为1562.34 nm和1563.11 nm的双波长暗脉冲输出,脉宽为3.8 ns,重复频率为13.5 MHz,信噪比为49 dB。通过调节偏振控制器和泵浦功率,改变腔内偏振态,实现了亮脉冲、暗脉冲、暗亮脉冲对的工作状态切换。该光纤激光器具有产生暗脉冲泵浦阈值功率较低、光-光转换效率更高、可切换的优势,展示了碳化钛在亮暗脉冲光纤激光器中的应用潜力。Objective With the advancements in laser technology,pulse lasers have been widely used in optical fiber communication,medical surgery,power transmission,material processing,and other fields.Pulse lasers can be classified into bright-and dark-pulsed lasers.A bright pulse refers to a significant increase in light intensity under a stable continuous light background,which is highly sensitive to noise and loss generated during the transmission of the optical waveguide and results in its power gradually decreasing during the transmission process.By contrast,a dark pulse exhibits a significant decrease in light intensity against a stable and continuous light background.Compared with bright pulses,dark pulses have unique advantages such as better stability in the presence of noise and reduced loss in optical fibers,and they are less influenced by stimulated Raman scattering within the pulse.These advantages enable dark pulses to have broad prospects in the fields of signal processing and long-distance communication.This study demonstrated that a fiber laser based on a Ti_(3)C_(2)Tx optical device has the advantages of a lower dark-pulsed pumping threshold power and higher optooptical conversion efficiency.It can realize the switching of bright and dark pulses as well as dark-pulsed pairs,thereby enriching the photon application of Ti_(3)C_(2)Tx in fiber lasers.Methods The nonlinear optical device investigated in this study was composed of a quartz substrate,HF-etched single-mode fiber(SMF),and Ti_(3)C_(2)Tx material.Ti_(3)C_(2)Tx powder of 10 mg was dissolved in 10 mL of N-methylpyrrolidone solvent and stirred with a magnetic mixer.Ultrasonicated treatment was then conducted in an ice bath for 120 min.Finally,the supernatant was centrifugated for 30 min at 3500 r/min,and 1 mg/mL of Ti_(3)C_(2)Tx dispersion was obtained.A section of 30 cm standard single-mode fiber SMF(core diameter:9μm;cladding diameter:125μm) was examined,on which a wire stripper was used to strip the coating layer and regulate the corrosion length t

关 键 词：光纤锁模激光器 倏逝场 亮暗脉冲切换 碳化钛 

分 类 号：TN25[电子电信—物理电子学]