1 中国工程物理研究院激光聚变研究中心,四川 绵阳 621900
2 四川省分析测试服务中心,四川 成都 610066
红外与激光工程
2023, 52(11): 20230234
强激光与粒子束
2023, 35(11): 111001
1 中国工程物理研究院激光聚变研究中心,四川 绵阳 621900
2 中国工程物理研究院研究生院,北京 100088
3 华南理工大学物理与光电学院,广东 广州 510640
在光通信、光学传感、精密测量、量子技术及原子物理等多个领域的需求牵引下,单纵模连续波激光器的输出稳定性和噪声特性需要进一步提升。本文针对单纵模激光器噪声中对输出功率稳定性起主要影响作用的强度噪声进行了讨论,阐述了其主要来源和产生机理,在此基础上对比分析了国内外当前主要的单纵模激光器强度噪声抑制技术和方法。为了提升大型激光装置前端系统中单纵模光纤激光器的输出稳定性,开展了基于半导体光放大器的强度噪声抑制技术研究,实现了强度噪声的有效抑制。
激光器 单纵模激光器 强度噪声 噪声抑制 激光与光电子学进展
2023, 60(23): 2300006
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
2 Graduate School of China Academy of Engineering Physics, Beijing 100193, China
3 Key Laboratory of Optical Fiber Sensing and Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
Matter and Radiation at Extremes
2023, 8(2): 029901
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
2 Graduate School of China Academy of Engineering Physics, Beijing 100193, China
3 Key Laboratory of Optical Fiber Sensing and Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
Broadband low-coherence light is considered to be an effective way to suppress laser plasma instability. Recent studies have demonstrated the ability of low-coherence laser facilities to reduce back-scattering during beam–target coupling. However, to ensure simultaneous low coherence and high energy, complex spectral modulation methods and amplification routes have to be adopted. In this work, we propose the use of a random fiber laser (RFL) as the seed source. The spectral features of this RFL can be carefully tailored to provide a good match with the gain characteristics of the laser amplification medium, thus enabling efficient amplification while maintaining low coherence. First, a theoretical model is constructed to give a comprehensive description of the output characteristics of the spectrum-tailored RFL, after which the designed RFL is experimentally realized as a seed source. Through precise pulse shaping and efficient regenerative amplification, a shaped random laser pulse output of 28 mJ is obtained, which is the first random laser system with megawatt-class peak power that is able to achieve low coherence and efficient spectrum-conformal regenerative amplification.
Matter and Radiation at Extremes
2023, 8(2): 025902
中国工程物理研究院 激光聚变研究中心,四川 绵阳 621900
强激光与粒子束
2023, 35(2): 029901
1 广西科技大学, 生物与化学工程学院, 广西 柳州 545006
2 广西科技大学, 广西糖资源绿色加工重点实验室, 广西 柳州 545006
3 广西蔗糖产业协同创新中心, 广西 南宁, 530004
拉曼光谱具有非接触、非破坏性、低成本、高通量优势, 受到了多组分体系分析的关注。独立成分分析(ICA)既是多元统计方法, 也是盲分离方法, 可以无需先验知识, 只需通过测量到的混合光谱就能解出体系中各组分的估计源光谱。但是当源光谱间存在显著重叠时, ICA分离结果不可靠。本文提出了一种通过对体系光谱求导、ICA分离, 逐级剔除分量后再分离的改进ICA定性分析算法(Derivation, Separation, Cullingand Separation, DSCS-ICA), 分离得到源光谱的近似估计, 实现体系定性分析, 解决了因光谱重叠导致的现有的ICA算法分离性能差的问题。依照布洛芬胶囊配方, 配制了布洛芬、硬脂酸、聚乙烯吡咯烷酮K30、淀粉和蔗糖五种组分不同比例混合的12份布洛芬胶囊样本, 并采集其拉曼光谱数据; 采用DSCS-ICA法解出分量(ICS), 并将ICS与源光谱进行比较, 以相关系数r来判断ICS与源光谱的一致性。结果表明: 与FastICA相比, DSCS-ICA效果显著改善, ICS与源光谱对应的相关系数r达到了0.99以上, 结果具有良好的可靠性和对应性。本案例可为药物处方成分的反向研究提供参考, 并可推广应用于其他多组分体系的定性分析。
独立成分分析 拉曼光谱 定性分析 布洛芬胶囊 Independent component analysis DSCS-ICA DSCS-ICA Raman spectroscopy Qualitative analysis Ibuprofen Capsules
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
2 Graduate School of China Academy of Engineering Physics, Beijing 100088, China
3 No.34 Institute of China Electronics Technology Group Corporation, Guilin 541004, China
Utilizing polarization maintaining photonic crystal fiber (PM-PCF) with the low temperature coefficient of birefringence, a two-dimensional tunable and temperature-insensitive Lyot filter aiming to compensate the frequency modulation to amplitude modulation (FM-to-AM) conversion in high power laser facility is demonstrated. The Jones matrix is applied to analyze the relationship between optical characteristics of the filter and physical parameters (including amplitude ratio, phase delay, and susceptibility of the birefringence to temperature) of the polarization optical field. Both the transmission peak wavelength and extinction ratio of the spectral transmission are able to be changed simultaneously, hence, it shows more efficient FM-to-AM compensation ability. Besides, the transmission peak shift is about 18 pm/℃ with the PM-PCF configuration, which is about two orders of magnitude less than the normal polarization maintaining fiber (PMF) configuration. The demonstrated filter presents a practical application potential in large scale laser driven facility.
Laser fusion optical fiber devices frequency modulation birefringence optical filters Photonic Sensors
2021, 11(3): 325
1 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
2 中国工程物理研究院等离子体物理重点实验室, 四川 绵阳 621900
3 IFSA协同创新中心上海交通大学, 上海 200240
报道了一种基于大模场光子晶体光纤放大的高峰值功率飞秒脉冲激光系统。该激光器系统采用光纤啁啾脉冲放大结构,种子源采用重复频率为40 MHz,脉冲宽度为500 fs,输出功率为10 mW的光纤激光器。利用体布拉格光栅(VBG)将脉冲展宽至500 ps,经过多级放大并利用声光调制器降频为500 kHz,然后采用大模场纤芯直径为40 μm和85 μm光子晶体光纤作为功率放大器,最后采用VBG压缩脉宽至767 fs,得到平均功率为104 W的激光输出,其中心波长为1030 nm,实现了峰值功率为0.271 GW的近衍射极限激光功率输出。
激光器 光纤放大器 高峰值功率 啁啾脉冲放大 超短脉冲