Coordination engineering in Nd3+-doped silica glass for improving repetition rate of 920-nm ultrashort-pulse fiber laser  

作　　者：Yafei Wang Yinggang Chen Shikai Wang Meng Wang Lei Zhang Suya Feng Fei Yu Guoping Dong Lei Wen Danping Chen Chunlei Yu Lili Hu 

机构地区：[1]Chinese Academy of Sciences,Shanghai Institute of Optics and Fine Mechanics,Key Laboratory of Materials for High Power Laser,Shanghai,China [2]University of Chinese Academy of Sciences,Beijing,China [3]University of Chinese Academy of Sciences,Hangzhou Institute for Advanced Study,Hangzhou,China [4]South China University of Technology,School of Materials Science and Engineering,State Key Laboratory of Luminescent Materials and Devices,Guangzhou,China

出　　处：《Advanced Photonics Nexus》2023年第6期14-21,共8页先进光子学通讯（英文）

基　　金：supported by the International Partnership Program of Chinese Academy of Sciences(Grant No.20XH1217);the National Natural Science Foundation of China(Grant Nos.61975216 and 62205356);the STCSM(Grant No.SKLSFO2022-02)。

摘　　要：Ultrashort pulses at 920 nm are a highly desired light source in two-photon microscopy for the efficient excitation of green fluorescence protein.Although Nd3þ-doped fibers have been utilized for 920-nm ultrashort pulse generation,the competitive amplified spontaneous emission(ASE)at 1.06μm remains a significant challenge in improving their performance.Here,we demonstrate a coordination engineering strategy to tailor the properties of Nd3þ-doped silica glass and fiber.By elevating the covalency between Nd3þand bonded anions via sulfur incorporation,the fiber gain performance at 920 nm is enhanced,and 1.06-μm ASE intensity is suppressed simultaneously.As a result,the continuous-wave laser efficiencies and signal-to-noise ratio at 920 nm by this fiber are significantly enhanced.Importantly,the stable picosecond pulses at 920 nm are produced by a passive mode-locking technique with a fundamental repetition rate up to 207 MHz,which,to the best of our knowledge,is the highest reported repetition rate realized by Nd3þ-doped silica fibers.The presented strategy enriches the capacity of Nd3þ-doped silica fiber in generating 920-nm ultrashort pulses for application in biophotonics,and it also provides a promising way to tune the properties of rare-earth ion-doped silica glasses and fibers toward ultrafast lasers.

关 键 词：rare-earth-doped fiber ultrashort pulse high repetition rate fiber laser 

分 类 号：TN2[电子电信—物理电子学]