高非线性光子晶体光纤中可见光至近红外超连续谱的产生  

Generation of Visible to Near-infrared Supercontinuum in Highly-nonlinear Photonic Crystal Fiber

作　　者：余海湖[1] 吴建文 马悦 杨小涛[1] 郑羽[1] YU Haihu;WU Jianwen;MA Yue;YANG Xiaotao;ZHENG Yu(National Engineering Research Center of Fiber Optic Sensing Technology and Networks,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学光纤传感技术与网络国家工程研究中心,武汉430070

出　　处：《光子学报》2022年第9期147-155,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.52072277)。

摘　　要：基于光子晶体光纤的色散设计,制备了零色散点位于880 nm、泵浦波长处非线性系数为33.67 km^(-1)·W^(-1)的实芯光子晶体光纤。使用1030 nm,150 fs的超快光源,研究了在不同泵浦功率和不同光纤长度下,从可见光至近红外区的超连续谱的产生过程。在1320 mW的平均泵浦功率下,使用1.5 m长的光子晶体光纤,实现了从450 nm到1900 nm的宽带超连续谱输出。光谱具有较好的平坦度和相干性。这类宽带超连续光源在光学相干层析成像、光谱学、通信、早期癌症检测和食品质量监测等领域具有应用价值。Supercontinuum refers to the phenomenon that the spectrum of a high power pulse transmitted in a nonlinear medium is broadened by a variety of nonlinear effects.The generation of supercontinuum can greatly broaden the spectrum of optical signals,usually to the range of tens to hundreds of nanometers.In addition,supercontinuum light has the advantages of super brightness,wide band,high stability and high spatial coherence.Therefore,it has great application value in many fields,such as optical frequency calculation,optical communication,optical coherence tomography and biomedical science.In 1976,the supercontinuum in fiber was observed for the first time in nanosecond pulses generated by dye lasers,but the band coverage of the supercontinuum is narrow and the pump power required is high.The photonic crystal fiber made up for these deficiencies.Photonic crystal fiber,also known as microstructured fiber,is a special fiber whose cross section has two-dimensional periodic refractive index variation and extends indefinitely along the fiber axis.Photonic crystal fibers exhibit many special optical properties due to the variation of refractive index contrast between core and cladding.Photonic crystal fiber plays an important role in optical fiber communication,optical fiber sensing,meteorology,medical imaging and supercontinuum generation due to its flexible structure and special optical properties.Photonic crystal fiber can obtain the position of zero dispersion point at the desired wavelength by adjusting the structure,thus generating supercontinuum spectrum based on various nonlinear effects.For the generation of supercontinuum in photonic crystal fibers,the excitation conditions and the optimization and adjustment of its flatness and spectrum width have always been the focus of research.Especially in engineering applications,supercontinuum has many specific requirements.Although some progress has been made in the study of visible to near-infrared supercontinuum in photonic crystal fibers,the reported spectrum broadeni

关 键 词：光子晶体光纤 超连续谱 高非线性 色散 飞秒脉冲 

分 类 号：O437[机械工程—光学工程]