全国产化高功率平坦型中红外超连续谱光源(简讯)  

High-power flat mid-infrared supercontinuum spectral light source(Newsletter)

作　　者：雷浩 焦亚东 谢昆林 赵鑫生 贾志旭[2] 秦冠仕[2] 李剑峰 LEI Hao;JIAO Yadong;XIE Kunlin;ZHAO Xinsheng;JIA Zhixu;QIN Guanshi;LI Jianfeng(State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China(UESTC),Chengdu 610054,China;State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China)

机构地区：[1]电子科技大学光电科学与工程学院,四川成都610000 [2]吉林大学电子科学与工程学院集成光电子学国家重点实验室,吉林长春130012

出　　处：《红外与激光工程》2024年第8期262-265,共4页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(U20A20210,62005040,61421002);四川省自然科学基金杰出青年科学基金项目(2023NSFSC1964)。

摘　　要：中红外超连续光谱(Supercontinuum,SC)激光源近年来引起了人们极大的兴趣,在组织成像、光谱学、国防和环境监测等领域得到了重要应用。采用全国产化器件搭建了输出功率为10.19 W、光谱范围1.25~4.05μm的全光纤超平坦SC激光源。其光谱的3 dB带宽为1290 nm,范围为2280~3570 nm;10 dB带宽为2390 nm,范围为1450~3840 nm。在连续运行24 h的条件下,实测功率稳定性为0.79%(均方根),证明该SC激光源具有良好的功率稳定性。该光源的成功研制推动了高性能超连续谱激光源的全国产化进程。Objective Supercontinuum(SC)sources spanning the near-infrared(NIR)and mid-infrared(MIR)regions have garnered significant interest and found widespread applications in tissue imaging,sensing,spectroscopy,defense,and environmental monitoring.While numerous SC laser systems with impressive performance have been reported globally,challenges such as low damage thresholds and susceptibility to deliquescence in air have persisted with fluoride nonlinear fibers(e.g.,ZBLAN and InF3 fibers),even with end cap protection during prolonged high-power operation.Hence,the imperative need arises to develop mid-infrared fibers characterized by higher damage resistance thresholds,enhanced nonlinear coefficients,and improved water resistance to elevate the overall performance of SC lasers.Methods A 1550 nm ns pulsed fiber laser was used as the seed source,and the seed pulse was first amplified and spectrally pre-broadened by a two-stage erbium-ytterbium doped fiber amplifier(EYDFA)and a section of single-mode fiber,respectively.The high-power flat 1.9-2.7μm SC laser was obtained by a thulium-doped fiber amplifier(TDFA)with power amplification and spectral broadening again.The 1.9-2.7μm SC laser was then coupled into a 60-cm-long fluorotellurite fiber(TBY)with a core diameter of 10μm.The TBY fiber exhibited a nonlinear coefficient of 22.4 W-1/km and a measured loss of 0.094 dB/m at 2μm.The schematic of the SC laser setup is depicted in Fig.1.Results and Discussions The SC spectrum characterization system comprised of a power meter(Thorlabs)for power measurement,an optical spectrum analyzer(Yokogawa,AQ630D)with a measurement range of 600-1700 nm to capture SC spectra at shorter wavelengths(<1.5μm),and a Mid-IR/IR spinning grating spectrometer(A.P.E,waveScan)with a measurement range of 1500-6500 nm for recording spectral distribution at longer wavelengths(>1.5μm).As depicted in Fig.2,the SC laser output spectrum exhibited gradual expansion and enhanced flatness with increasing pump power,reaching a spectrum range of 1.25 to 4.05

关 键 词：超连续谱 超平坦 国产化 氟碲酸盐光纤 

分 类 号：O433[机械工程—光学工程]