基于石墨烯的全光纤主动锁模激光器  

All-Fiber Actively Mode-Locked Laser Based on Graphene

作　　者：苏友朋 常建华[1,2,3] 陆天一 崔志远 涂倩 朱云瀚 Su Youpeng;Chang Jianhua;Lu Tianyi;Cui Zhiyuan;Tu Qian;Zhu Yunhan(TianChang Research Institute,Nanjing University of Information Science&Technology,Chuzhou 239300,Anhui,China;School of Electronics&Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China;Collaborative Innovation Center of 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：《光学学报》2024年第7期92-100,共9页Acta Optica Sinica

基　　金：国家自然科学基金(62175114,62375137)。

摘　　要：利用光纤倏逝波耦合效应,设计了一种基于石墨烯全光纤结构的主动锁模激光器。该石墨烯全光纤锁模器件基于侧面腐蚀的单模光纤,构建了银/聚二甲基硅氧烷(PDMS)/石墨烯的电容型结构,腐蚀的单模光纤置于PDMS和石墨烯之间。实验结果显示,在电容结构两端施加与激光腔的共振频率一致及其整数倍的周期性方波电压信号,并对腔内光进行调制,可实现1558 nm光纤激光器的主动锁模。所设计的主动锁模激光器获得了基本频率及二次谐波的锁模脉冲,重复频率分别为12.2 MHz和24.4 MHz,实现了电控重复频率的脉冲输出。这种石墨烯全光纤锁模器件具有低成本、低功耗的优势,为实现灵活可控的主动锁模激光器提供了新思路。Objective Ultra-fast pulse fiber lasers are extensively employed in fields such as fiber optic communication,medicine,and precision material processing due to their compact structure and high beam quality.Lock mode technology is an effective method for achieving ultra-short pulses.Actively mode-locked lasers introduce active modulation devices into the laser cavity and adopt external modulation signals to change the optical signal characteristics,achieving a laser modelocked pulse output.They feature flexibility,controllability,and stable output pulses.In recent years,graphene has been extensively studied due to its excellent electro-optical properties.Research has shown that an external electric field can alter the Fermi level of graphene to achieve light absorption modulation.Therefore,graphene-based electro-optic modulators have the potential to achieve actively mode-locked lasers.We present the construction of an efficient and highspeed graphene all-fiber mode-locked device,which achieves high-speed adjustment of graphene's optical performance with low modulation power consumption and high modulation efficiency.Methods The device is composed of graphene,single-mode optical fiber,polydimethylsiloxane(PDMS),and silver(Ag)film,forming a capacitive device(GCD)structure.By selecting glass as the substrate and leveraging magnetron sputtering technology to deposit 50 nm silver on the glass as the bottom electrode,silver has sound conductivity,which is beneficial for reducing the device resistance.The insulation layer is a spin-coated 200 nm PDMS layer,and the thinner insulation layer can effectively reduce the capacitance value of the device.Meanwhile,hydrofluoric acid(HF)with a concentration of 20%is utilized to corrode standard single-mode optical fibers to 15μm with a corrosion length of 5 mm,and the corroded single-mode fiber is transferred to PDMS.The device is placed in a UV ozone cleaning machine(multi-frequency,CCI UV250-MC)for 10 minutes to improve the hydrophilicity of the insulation layer PDMS.There is g

关 键 词：激光器 光纤激光器 石墨烯 全光纤结构 主动锁模 

分 类 号：TN25[电子电信—物理电子学]