1 中国石油集团安全环保技术研究院有限公司，北京 102206
2 中国石油西南油气田公司安全环保与技术监督研究院，四川 成都 610041
3 中国石油大港石化公司，天津 300280
氢气物性活泼，容易泄漏引发着火爆炸事故。在布置点型氢气传感器的基础上，通过拉曼激光雷达遥测技术加强氢气泄漏非接触式远距离、大覆盖面监检测，能够为氢能利用场景多元化的高速发展和保障氢能安全高效利用提供支撑。首先概述了气体拉曼散射基本原理，其次从系统结构和检测效果两方面介绍了国内外氢气泄漏拉曼激光雷达遥测技术的研究进展，最后对拉曼激光雷达遥测技术在氢气泄漏监检测方面的应用进行了展望。
遥感 激光雷达 反向散射 拉曼效应 氢气泄漏 激光与光电子学进展
2023, 60(22): 2200005
Author Affiliations
Abstract
School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P. R. China
The miniaturized femtosecond laser in near infrared-II region is the core equipment of three-photon microscopy. In this paper, we design a compact and robust illumination source that emits dual-color linearly polarized light for three-photon microscopy. Based on an all-polarization-maintaining passive mode-locked fiber laser, we shift the center wavelength of the pulses to the 1.7μm band utilizing cascade Raman effect, thereby generate dual-wavelength pulses. To enhance clarity, the two wavelengths are separated through the graded-index multimode fiber. Then we obtain the dual-pulse sequences with 1639.4nm and 1683.7nm wavelengths, 920fs pulse duration, and 23.75MHz pulse repetition rate. The average power of the signal is 53.64mW, corresponding to a single pulse energy of 2.25nJ. This illumination source can be further amplified and compressed for three-photon fluorescence imaging, especially dual-color three-photon fluorescence imaging, making it an ideal option for biomedical applications.
Three-photon fluorescence imaging illumination source dual-wavelength femtosecond pulse cascaded Raman effect graded-index multimode fiber Journal of Innovative Optical Health Sciences
2023, 16(5): 2241005
为了将非线性效应强度的测量延伸到五阶非线性上，本文理论研究电磁诱导透明系统中的五阶非线性效应。研究结果表明，量子相干效应极大地增强电磁诱导透明系统的非线性效应，其中三阶互非线性的电极化率可以激发拉曼散射和四波混频，五阶互非线性的电极化率有两个完全不同的非线性吸收和色散，非线性吸收的五阶互非线性的电极化率可以激励四光子吸收，非线性增益的五阶互非线性可以激励超级拉曼散射，两者五阶互非线性的电极化率都可以激励六波混频。
原子与分子物理学 电磁诱导透明 五阶互非线性效应 拉曼效应 六波混频 激光与光电子学进展
2021, 58(17): 1702001
强激光与粒子束
2021, 33(7): 071001
强激光与粒子束
2021, 33(2): 021001
1 中国科学院安徽光学精密机械研究所 中国科学院大气光学重点实验室, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
3 安徽蓝盾光电子股份有限公司, 安徽 铜陵 244000
激光雷达探测臭氧和气溶胶垂直廓线分布近年来在环境监测领域获得广泛应用。介绍了一套可同时用于探测臭氧和气溶胶浓度的激光雷达系统。采用Nd:YAG激光器, 通过二倍频器和四倍频器分别产生532 nm和266 nm激光光源, 基于受激拉曼散射原理, 在两根拉曼管中分别充有氘气和氢气, 产生拉曼频移光289 nm, 299 nm, 通过差分吸收算法原理反演垂直空间臭氧浓度廓线, 通过米散射算法原理来反演气溶胶浓度廓线。水平扫描试验结果显示, 雷达系统的探测结果与近地面点式臭氧分析仪测量结果有较好的一致性, 相对误差小于10%。在安徽合肥科学岛外场观测结果表明: 臭氧探测高度, 白天可以达到3 km, 晚上可以达到5 km, 气溶胶探测高度, 白天可以达到10 km, 晚上可以达到15 km。
户外型 激光雷达 臭氧 气溶胶 拉曼效应 outdoor lidar ozone aerosol Raman effect 红外与激光工程
2019, 48(7): 0706008
提出一种基于光纤拉曼效应的光纤连接损耗测量方案，并介绍了光纤连接损耗测量相关的计算公式，针对普通单模光纤连接损耗测量精度进行了模拟计算。通过这种技术方案，只需要在光纤熔接工作现场就可以对光纤连接头的损耗进行测试，将有效提高光缆施工工作效率。
光纤连接损耗 光纤拉曼效应 光纤连接头 光缆 optical fiber connection loss optical fiber Raman effect optical fiber connector optical cable
中国电子科技集团公司第五十四研究所, 河北 石家庄 050081
基于光通信系统对于全光调制和全光开关等的需求, 从理论上和实验上研究了拉曼增益对回音壁模式光学微腔系统共振模式的全光调制。理论分析表明, 拉曼增益能够补偿回音壁模式光学微腔系统的损耗, 进而改变微腔系统的耦合机制, 在不对微腔系统做任何机械性移动的前提下实现对系统共振透射率的连续调制。实验中采用光纤锥耦合的二氧化硅微芯圆环腔, 利用560 ?滋W的低功率泵浦光引发的拉曼散射, 波长为1 545.7 nm的信号光实现了13.5 dB的调制度, 使得系统的耦合机制由欠耦合转化为临界耦合。
光学微腔 拉曼效应 全光调制 集成光学 optical micro-cavities Raman effect all optical control integrated optics 红外与激光工程
2017, 46(11): 1122003
Author Affiliations
Abstract
1 Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
4 Key Laboratory of Science and Technology on High Energy Laser, CAEP, Mianyang 621900, China
A low-threshold Raman effect in a kilowatt ytterbium-doped narrowband fiber amplifier system is reported. The Raman Stokes light at 1120 nm is achieved with the total output power of only ～400 W, indicating that the Raman threshold of this kilowatt codirectional pumped continuous wave fiber amplifier is much lower than the predicted value estimated by the classic formula. To figure out the mechanism of this phenomenon, simulations based on the general stimulated Raman scattering (SRS) model are analyzed indicating that the key factor is the coupling between four-wave mixing (FWM) and SRS. The simulation results are in good agreement with our experiments.
190.0190 Nonlinear optics 140.3510 Lasers, fiber 190.5650 Raman effect 190.4380 Nonlinear optics, four-wave mixing Chinese Optics Letters
2016, 14(1): 011901
Author Affiliations
Abstract
1 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 University of Chinese Academy of Science, Beijing 100190, China
A 1.88 μm Ba(NO3)2-based stimulated Raman scattering (SRS) laser pumped by a potassium-titanyl-phosphate-based optical parametric oscillator (OPO) laser is presented. Under the pumping energy of a 130 mJ 1064 nm Q-switched Nd:YAG laser, a 40 mJ 1.57 μm laser is achieved; the maximum output energy of the 1.88 μm Raman laser reaches 7.5 mJ with a pulse duration of 5.3 ns at repetition rates of 10 Hz, and the corresponding total optical conversion efficiency is about 5.8%. The combination of the SRS and OPO techniques significantly extends the wavelength from 1.064 to 1.57 μm (OPO) and then demonstrates Stokes-shifting to 1.88 μm (SRS).
140.3550 Lasers, Raman 140.3538 Lasers, pulsed 190.5650 Raman effect 190.4970 Parametric oscillators and amplifiers Chinese Optics Letters
2016, 14(11): 111401
