Bing HAN 1,2Yuxi MA 1,2Han WU 3,*Yong ZHAO 1,2
作者单位
摘要
1 College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
2 Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao 066004,China
3 College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
Fiber optic sensors refractive index measurements fiber lasers Rayleigh scattering stimulated Raman scattering 
Photonic Sensors
2024, 14(1): 240121
作者单位
摘要
北京大学未来技术学院,国家生物医学成像科学中心,北京 100871
相干拉曼散射(CRS)技术作为一种重要的无标记化学成像技术,通过相干激发分子协同振动对拉曼散射信号进行增益,显著地提高了成像速度,广泛应用于材料学、生物化学、肿瘤诊断、药代动力学等领域。超快脉冲激光器的出现实现了亚皮秒持续时间的脉冲输出,使得通过脉冲激发实现大量振动模式的同步相干激发成为新的CRS实现途径。从相干拉曼散射基本原理出发,介绍时域相干拉曼散射的主要实现途径,着重讨论时域受激拉曼散射(SRS)和时域相干反斯托克斯拉曼散射(CARS)的最新进展与应用。
拉曼光谱技术 相干拉曼散射 受激拉曼散射 相干反斯托克斯拉曼散射 时域 频域 
激光与光电子学进展
2024, 61(6): 0618007
作者单位
摘要
安徽大学物理与光电工程学院, 安徽 合肥 230601
与常规的自发拉曼散射相比,受激拉曼散射 (SRS) 经常使用两束光场 (泵浦光和Stokes光),这为偏振操控SRS过程提供了一个额外的自由度。为此,开展了泵浦光分别为圆偏振和线偏振的SRS对比研究。首先,基于非线性耦合波方程,从理论上分别推导了泵浦光为圆偏振和线偏振时 (Stokes光始终保持线偏振) SRS信号强度表达式。随后,以具有球对称的甲烷分子为例,实验测量了上述两种偏振光泵浦下甲烷分子υ1和υ3振动模在2800~3100 cm-1的SRS光谱。实验结果与理论分析一致表明:SRS的信号强度不仅与泵浦光的偏振态有关,还与待测分子振动模式的对称性紧密相关。本研究结果为SRS的偏振应用提供了有益启示。
非线性光学 偏振效应 受激拉曼散射 泵浦光 nonlinear optics polarization effect stimulated Raman scattering pump light 
量子电子学报
2024, 41(1): 78
盛泉 1,2耿婧旎 1,2李锦辉 3付士杰 1,2,*[ ... ]姚建铨 1,2
作者单位
摘要
1 天津大学精密仪器与光电子工程学院,天津 300072
2 天津大学光电信息技术教育部重点实验室,天津 300072
3 东南大学成贤学院,江苏 南京 210088
报道了基于Nd∶YVO4激光晶体和钨酸钆钾(KGW)拉曼晶体的端面泵浦连续波内腔拉曼激光器,实验研究了基频激光偏振方向对KGW拉曼激光器输出功率、光谱和模式特性的影响。当基频光偏振方向平行于KGW晶体的Nm轴时,901 cm-1拉曼频移增益较高,在36.6 W半导体激光泵浦功率下获得了6.63 W的 1177.3 nm连续波斯托克斯光输出,光光效率和斜效率分别为18.1%和24.7%;而当基频光沿KGW晶体Ng轴偏振时,由于768 cm-1和901 cm-1两条拉曼谱线的竞争以及对应89 cm-1小波数拉曼峰的级联拉曼斯托克斯光起振,拉曼激光器的光谱和功率特性均发生劣化。在实验中还观察到KGW像散的热透镜效应对激光模式产生的影响。
激光器 受激拉曼散射 连续波拉曼激光器 内腔拉曼激光器 钨酸钆钾晶体 
中国激光
2024, 51(5): 0501003
李昊 1,2杨保来 1,2饶斌裕 1,2叶新宇 1,2[ ... ]陈金宝 1,2
作者单位
摘要
1 国防科技大学前沿交叉学科学院,湖南 长沙 410073
2 国防科技大学南湖之光实验室,湖南 长沙 410073
光纤光栅(FBG)在高功率光纤振荡器中发挥着重要作用,既可以作为谐振腔腔镜,又可以抑制受激拉曼散射(SRS)效应。使用飞秒激光在芯径为30 μm的大模场双包层光纤(LMA-DCF)上刻写了波长为1080 nm的FBG对以及波长为1135 nm的啁啾倾斜光纤光栅(CTFBG),利用FBG对搭建了全光纤振荡器,并使用CTFBG抑制了SRS,实现了9 kW激光功率输出,斜率效率为83.4%。研究结果有利于推动高功率FBG的研制和高功率光纤振荡器的发展。
光纤光学 飞秒激光 光纤振荡器 高功率激光器 受激拉曼散射 光纤光栅 
中国激光
2024, 51(5): 0515001
Author Affiliations
Abstract
National University of Singapore, College of Design and Engineering, Optical Bioimaging Laboratory, Department of Biomedical Engineering, Singapore
Three-dimensional (3D) imaging is essential for understanding intricate biological and biomedical systems, yet live cell and tissue imaging applications still face challenges due to constrained imaging speed and strong scattering in turbid media. Here, we present a unique phase-modulated stimulated Raman scattering tomography (PM-SRST) technique to achieve rapid label-free 3D chemical imaging in cells and tissue. To accomplish PM-SRST, we utilize a spatial light modulator to electronically manipulate the focused Stokes beam along the needle Bessel pump beam for SRS tomography without the need for mechanical z scanning. We demonstrate the rapid 3D imaging capability of PM-SRST by real-time monitoring of 3D Brownian motion of polystyrene beads in water with 8.5 Hz volume rate, as well as the instant biochemical responses to acetic acid stimulants in MCF-7 cells. Further, combining the Bessel pump beam with a longer wavelength Stokes beam (NIR-II window) provides a superior scattering resilient ability in PM-SRST, enabling rapid tomography in deeper tissue areas. The PM-SRST technique provides ∼twofold enhancement in imaging depth in highly scattering media (e.g., polymer beads phantom and biotissue like porcine skin and brain tissue) compared with conventional point-scan SRS. We also demonstrate the rapid 3D imaging ability of PM-SRST by observing the dynamic diffusion and uptake processes of deuterium oxide molecules into plant roots. The rapid PM-SRST developed can be used to facilitate label-free 3D chemical imaging of metabolic activities and functional dynamic processes of drug delivery and therapeutics in live cells and tissue.
stimulated Raman scattering tomography deep tissue Raman imaging spatial light modulation 
Advanced Photonics
2024, 6(2): 026001
李昊 1,2陈金宝 1,2叶新宇 1,2王崇伟 1,2[ ... ]王泽锋 1,2,**
作者单位
摘要
1 国防科技大学前沿交叉学科学院,湖南 长沙 410073
2 国防科技大学南湖之光实验室,湖南 长沙 410073
啁啾倾斜光纤布拉格光栅(CTFBG)是高功率光纤激光系统中抑制受激拉曼散射(SRS)的关键器件。使用飞秒激光在50 μm/400 μm光纤上研制了可承受10 kW激光功率的CTFBG。CTFBG插入损耗为0.03 dB,制冷后的功率温升系数仅为2.4 ℃/kW,验证了飞秒激光刻写的CTFBG具有优异的功率承受能力。
光纤光学 飞秒激光 高功率光纤激光器 受激拉曼散射 光纤布拉格光栅 啁啾倾斜光纤布拉格光栅 
中国激光
2024, 51(2): 0215001
作者单位
摘要
北京邮电大学 信息光子学与光通信全国重点实验室, 北京 100876
近年来,在计算物理领域提出了一种具有变革意义的利用神经网络直接求解微分方程的方案——物理信息神经网络(physics-informed neural network, PINN), 引起了广泛关注, 并且已经在多个领域的微分方程相关的问题中都得到了成功的验证。着眼于光纤非线性的建模,针对光纤中:光信号传输时受损耗、色散以及非线性等多种物理效应影响而发生演化;受激拉曼散射引起的功率转移;光模场在多种几何结构光纤中的分布与传输这三个场景展开研究。在数学上,这三个场景的控制方程分别为:非线性薛定谔方程、受激拉曼散射常微分方程以及傍轴亥姆霍兹方程,文中先后呈现了利用PINN求解这三个方程的具体实施方案及结果,并与数值方法进行对比分析,二者结果显示出较高的一致性, 且PINN具备更低的计算复杂度。PINN作为一种精准、高效的微分方程求解框架,在未来有潜力推进光纤非线性建模的发展。
光纤非线性 科学计算 物理信息神经网络 非线性薛定谔方程 受激拉曼散射 傍轴亥姆霍兹方程 nonlinear dynamic of fiber optics scientific computing physics-informed neural network nonlinear Schrödinger equation stimulated Raman scattering paraxial Helmholtz equation 
红外与激光工程
2023, 52(12): 20230188
Author Affiliations
Abstract
1 School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing, China
2 MIIT Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, Nanjing, China
With the increasing power of fiber lasers, single chirped and tilted fiber Bragg gratings (CTFBGs) cannot completely mitigate continuously enhanced system-excited stimulated Raman scattering (SRS). Although improving the loss rate of a single CTFBG or cascading multiple CTFBGs can provide better suppression of the stronger SRS, excessive insertion loss may cause significant attenuation of the output power. Confronting the challenge, we firstly present an SRS mitigation method based on a dual-structure fiber grating in this paper. The dual-structure fiber grating comprises a CTFBG and a fiber Bragg grating structure, which were designed and fabricated on a passive 25/400 double-clad fiber. To evaluate the performance of the grating, a 3 kW fiber master oscillator power amplifier laser is established. The experimental results demonstrate that the SRS mitigation rate of the grating is greater than 30 dB (99.9%), whereas the insertion loss is only approximately 3%, thus allowing for minimal deterioration of the output power. This solves the contradiction between high suppression rate and high insertion loss faced by CTFBGs, which in turn makes dual-structure fiber gratings particularly suitable for mitigating SRS in 3–5 kW high-power fiber lasers.
dual-structure fiber grating fiber optics component high-power fiber laser stimulated Raman scattering 
High Power Laser Science and Engineering
2023, 11(6): 06000e92
Chaoyu Ning 1,2,3,4Shuzhen Zou 1,4Haijuan Yu 1,2,3,4Jiexi Zuo 1,2,3,4[ ... ]Xuechun Lin 1,2,3,4,*
Author Affiliations
Abstract
1 Laboratory of All-Solid-State Light Sources, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
3 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, China
4 Beijing Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing, Beijing, China
In this work, we experimentally investigate the dependence of the stimulated Raman scattering (SRS) effect on the seed linewidth of a high-power nanosecond superfluorescent fiber source (ns-SFS). The results reveal that the SRS in the ns-SFS amplifier is significantly influenced by the full width at half maximum (FWHM) of the ns-SFS seed, and there is an optimal FWHM linewidth of 2 nm to achieve the lowest SRS in our case. The first-order SRS power ratio increases rapidly when the seed’s linewidth deviates from the optimal FWHM linewidth. By power scaling the ns-SFS seed with the optimal FWHM linewidth, a narrowband all-fiberized ns-SFS amplifier is achieved with a maximum average power of 602 W, pulse energy of 24.1 mJ and corresponding peak power of 422.5 kW. This is the highest average power and pulse energy achieved for all-fiberized ns-SFS amplifiers to the best of our knowledge.
fiber amplifier high power nanosecond superfluorescent fiber source stimulated Raman scattering effect 
High Power Laser Science and Engineering
2023, 11(6): 06000e88

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