受激布里渊散射海洋激光雷达时域脉冲特性  

Time-domain pulse characteristics of stimulated Brillouin scattering ocean lidar

作　　者：贾晓红 何兴道[2,3] 史久林[2,3] JIA Xiaohong;HE Xingdao;SHI Jiulin(School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Key Laboratory for Optoelectronic Information Perception and Instrumentation of Jiangxi Province,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Nondestructive Test(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191 [2]南昌航空大学,光电信息感知技术与仪器江西省重点实验室,南昌330063 [3]南昌航空大学,无损检测教育部重点实验室,南昌330063

出　　处：《物理学报》2025年第9期177-185,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:41776111,12264031);国防基础科研计划(批准号:JCKY2019401D002)资助的课题.

摘　　要：受激布里渊散射激光雷达探测技术具有高分辨、高信噪比、强抗干扰能力等优势,在海水温-盐-声多参数联合测量方面具有重要应用前景.受激布里渊散射是一个非线性动态过程,其发生位置、峰值强度、谱线形状等随时间而变化.本文基于分布式噪声模型对不同激光波长、脉宽及焦距的水中受激布里渊散射时域信号进行了理论模拟及分析,研究了聚焦与非聚焦两种结构产生的Stokes脉冲特性.结果表明:波长越短,Stokes散射光的峰值功率越高,在低入射能量时短脉冲获得更强的散射光,而高入射能量时,长脉冲更具优势,焦距越大,散射光峰值功率越低,脉冲保真度越好;随着入射能量的增加,非聚焦结构的Stokes散射光脉冲宽度不断增加,聚焦结构的Stokes散射光脉宽先减小后增大,且存在受温度和能量影响的最佳压缩值,低温时,Stokes散射光脉宽在阈值能量附近具有更好的压缩效果.研究结果对提升受激布里渊散射激光雷达探测性能具有重要意义.Stimulated Brillouin scattering lidar(SBS-LiDAR)technology possesses significant advantages such as high resolution,high signal-to-noise ratio,and strong anti-interference capacity,making it highly promising for simultaneous measurements of temperature,salinity,and sound velocity in seawater.Stimulated Brillouin scattering(SBS)is a nonlinear dynamic process characterized by temporal variations in its occurrence location,peak intensity,and spectral shape.Through numerical simulations of Stokes pulse,the conditions for SBS generation can be quantitatively determined,thereby establishing a theoretical foundation for optimizing lidar systems and enhancing their detection capabilities.Existing studies on Stokes pulses typically focus on specific experimental configurations under varying parameters,including medium properties,pump laser characteristics,and ambient environmental factors.There are still significant discrepancies in reported conclusions regarding the relationship between incident energy levels and pulse width variations,particularly in water-based environments where systematic research on the Stokes scattering pulse characteristics is clearly insufficient.In this study,a distributed noise model is used to theoretically simulate and analyze the time-domain signals of SBS in water at different laser wavelengths,pulse widths,and focal lengths.The characteristics of Stokes pulses generated by focused and non-focused configurations are investigated.The results indicate that under the same conditions,shorter incident wavelength produces significantly higher peak power of Stokes scattering light.The Stokes scattering light exhibits significant energy-dependent behavior:at low input energy,short pulse generates stronger scattering signal due to enhanced nonlinear interaction efficiency,while at high input energy,longer pulse exhibits excellent performance by maintaining temporal coherence.The larger focal length results in lower peak power but better pulse fidelity.As the incident energy increases,the pulse width

关 键 词：受激布里渊散射 激光雷达 分布式噪声模型 时域脉冲波形 

分 类 号：TN958.98[电子电信—信号与信息处理]