Author Affiliations
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
In this paper, a new concept of forward-pumped random Raman fiber laser (RRFL)-based liquid refractive index sensing is proposed for the first time. For liquid refractive index sensing, the flat fiber end immersed in the liquid can act as the point reflector for generating random fiber lasing and also as the sensing head. Due to the high sensitivity of the output power of the RRFL to the reflectivity provided by the point reflector in the ultralow reflectivity regime, the proposed RRFL is capable of achieving liquid refractive index sensing by measuring the random lasing output power. We theoretically investigate the effects of the operating pump power and fiber length on the refractive index sensitivity for the proposed RRFL. As a proof-of-concept demonstration, we experimentally realize high-sensitivity half-open short-cavity RRFL-based liquid refractive index sensing with the maximum sensitivity and the sensing resolution of –39.88 W/RIU and 2.507 5 × 10-5 RIU, respectively. We also experimentally verify that the refractive index sensitivity can be enhanced with the shorter fiber length of the RRFL. This work extends the application of the random fiber laser as a new platform for highly-sensitive refractive index sensing in chemical, biomedical, and environmental monitoring applications, etc.
Fiber optic sensors refractive index measurements fiber lasers Rayleigh scattering stimulated Raman scattering 
Photonic Sensors
2024, 14(1): 240121
Author Affiliations
College of Electronics and Information Engineering, Sichuan University, Chengdu, China
Nonlinear compression has become an obligatory technique along with the development of ultrafast lasers in generating ultrashort pulses with narrow pulse widths and high peak power. In particular, techniques of nonlinear compression have experienced a rapid progress as ytterbium (Yb)-doped lasers with pulse widths in the range from hundreds of femtoseconds to a few picoseconds have become mainstream laser tools for both scientific and industrial applications. Here, we report a simple and stable nonlinear pulse compression technique with high efficiency through cascaded filamentation in air followed by dispersion compensation. Pulses at a center wavelength of 1040 nm with millijoule pulse energy and 160 fs pulse width from a high-power Yb:CaAlGdO4 regenerative amplifier are compressed to 32 fs, with only 2.4% loss from the filamentation process. The compressed pulse has a stable output power with a root-mean-square variation of 0.2% over 1 hour.
femtosecond pulse filamentation nonlinear compression 
High Power Laser Science and Engineering
2023, 11(6): 06000e84
Author Affiliations
1 College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan 610064, China.
2 Key Laboratory of High Energy Density Physics and Technology (MoE), College of Physics, Sichuan University, Chengdu 610064, China.
3 College of Physics, Key Laboratory of High Energy Density Physics and Technology of the Ministry of Education, Sichuan University, Chengdu, Sichuan 610064, China.
Mid-infrared (MIR) ultra-short pulses with multiple spectral-band coverage and good freedom in spectral and temporal shaping are desired by broad applications such as steering strong-field ionization, investigating bound-electron dynamics, and minimally invasive tissue ablation. However, the existing methods of light transient generation lack freedom in spectral tuning and require sophisticated apparatus for complicated phase and noise control. Here, with both numerical analysis and experimental demonstration, we report the first attempt, to the best our knowledge, at generating MIR pulses with dual-wavelength spectral shaping and exceptional freedom of tunability in both the lasing wavelength and relative spectral amplitudes, based on a relatively simple and compact apparatus compared to traditional pulse synthesizers. The proof-of-concept demonstration in steering the high-harmonic generation in a polycrystalline ZnSe plate is facilitated by dual-wavelength MIR pulses shaped in both spectral and temporal domains, spanning from 5.6 to 11.4 μm, with multi-microjoule pulse energy and hundred- milliwatt average power. Multisets of harmonics corresponding to different fundamental wavelengths are simultaneously generated in the deep ultraviolet region, and both the relative strength of individual harmonics sets and the spectral shapes of harmonics are harnessed with remarkable freedom and flexibility. This work would open new possibilities in exploring femtosecond control of electron dynamics and light–matter interaction in composite molecular systems.
Ultrafast Science
2023, 3(1): 0022
吴晗 1,2陈浩然 1解小雨 1,2涂浪平 1[ ... ]常钰磊 1,**
1 中国科学院长春光学精密机械与物理研究所 发光学及应用国家重点实验室,吉林 长春 130033
2 中国科学院大学,北京 100049
利用溶剂热法制备了六角相NaYF4∶20%Yb,2%Er@NaYF4@NaYbF4∶0.5%Tm@NaYF4多层核壳结构稀土掺杂上转换纳米粒子,研究其在低温场(10~295 K)及980 nm激发下分别来自于Er3+的绿色与红色以及Tm3+的蓝色发光的上转换发光性质。结果显示,绿光强度随温度升高呈现出先增后降的变化趋势,而蓝光强度随温度升高呈现热衰减的趋势。本工作利用发光强度比的测温方法实现了精准的温度测量,相对灵敏度可达3.2%·K-1。并通过改变外层发光壳层的厚度调节发光强度比,进一步应用于低温场光学防伪。
稀土纳米粒子 发光强度比测温 上转换发光 低温场 防伪 rare-earth nanoparticles luminescence intensity ratio(LIR)thermometry upconversion luminescence cryogenic field anticounterfeiting 
2023, 44(8): 1335
大连理工大学 高性能精密制造全国重点实验室,辽宁大连116085
加速度计底座组件 视觉与力觉反馈 分层架构软件 温度反馈 自动装配与焊接 accelerometer base assembly visual and force feedback hierarchical architecture software temperature feedback automatic welding 
光学 精密工程
2023, 31(16): 2395
Han Wu 1†Weizhe Wang 1†Bo Hu 1Yang Li 1[ ... ]Houkun Liang 1,6,*
Author Affiliations
1 College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
2 International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
3 Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4 e-mail:
5 e-mail:
6 e-mail:
Nonlinear frequency conversion of wavelength agile and high-power random fiber lasers can provide a promising way to generate continuous-wave (CW) visible and mid-infrared (MIR) light with unique properties such as the continuous modeless spectrum, low temporal/spatial coherence, and high temporal stability. Here, we report a dual-wavelength switchable and tunable random Raman fiber laser (RRFL) based on a phosphosilicate fiber that has two Raman gain peaks for the first time and demonstrate its superior capability to generate widely tunable CW visible and mid-infrared light via nonlinear frequency conversions. By using the combination of a tunable pump and two tunable gratings in Littrow configuration that can provide separated point feedback for the two Stokes wavelengths corresponding to silica- and phosphorus-related Raman peaks, the spectrum of an RRFL can be flexibly manipulated for the aim of nonlinear frequency conversions, including single-wavelength tunable emission at the 1.1 μm or 1.2 μm band for second-harmonic generation (SHG), dual-wavelength simultaneously tunable emission at the 1.1 μm and 1.2 μm bands for the sum-frequency generation (SFG), and dual-wavelength separation tunable emission for difference-frequency generation (DFG). As a result, with the combination of SHG and SFG in a periodically poled lithium niobate crystal array, we experimentally demonstrate the broadest tuning range (560–630 nm) of visible light generated from an RRFL, to the best of our knowledge. The tunable MIR light in the range of 10.7–12.3 μm is also demonstrated through DFG of an RRFL operating in separation tunable dual-wavelength emission mode in a BaGa4Se7 (BGSe) crystal, which is the first realization of >10 μm CW DFG in the BGSe crystal. We believe the developed dual-wavelength switchable and tunable RRFL can provide a new compact, robust, and cost-effective platform to realize broadly tunable light in both the visible and MIR regions, which can also find potential applications in imaging, sensing, and temporal ghost imaging in various spectral bands.
Photonics Research
2023, 11(5): 808
四川大学电子信息学院,四川 成都 610064
中红外(2.5 μm~25 μm)波段包含许多重要的原子和分子共振峰,因此中红外超连续谱广泛应用于生物医学、光谱学和环境科学等领域。碲化镉(cadmium telluride, CdTe)在中红外波段具有超宽的透射光谱范围0.86 μm~25 μm,同时CdTe具有较大的三阶非线性系数,是实现中红外超连续谱的理想材料。本文设计并加工了一种基于CdTe为芯层、低折射率介质硫化镉为缓冲层、硅为衬底的波导。采用广义非线性薛定谔方程仿真了该波导以中心波长为5.5 μm中红外激光作为泵浦,能够实现4.1 μm~9.7 μm的超连续谱输出。实验中通过湿法刻蚀制作CdTe多晶波导,并采用中心波长为1030 nm,脉冲宽度为250 fs的激光器作为泵浦源,观察到在波导中发生明显的自相位调制而产生的光谱展宽。该工作为CdTe集成波导应用于中红外超连续谱及中红外波段的片上光学器件提供了新的可能。

集成波导 超连续谱 中红外激光 超快激光 integrated waveguide supercontinuum mid-infrared laser ultrafast laser 
2023, 50(2): 220313
1 上海大学机电工程与自动化学院精密机械工程系,上海 200072
2 上海瑞立柯信息科技有限公司,上海 200233
3 宁波维真显示科技股份有限公司,浙江 宁波 315105
全息真三维显示 空间悬浮动态显示 多空间光调制器拼接 超声雾化介质 时间平均法 
2023, 60(8): 0811021
1 华中科技大学机械科学与工程学院数字制造装备与技术国家重点实验室,湖北 武汉 430074
2 广东省智能机器人研究院,广东 东莞 523808
异质材料连接,尤其是金属和玻璃,广泛应用在各种工业产品上。超快激光焊接异质材料是一种快速、清洁和非接触的新技术,近年来得到了广泛研究。采用分子动力学方法对飞秒激光作用铝和石英玻璃界面进行了理论模拟研究,模拟根据石英玻璃的熔点和弹性常数,构建了石英玻璃的Lennard-Jones(LJ)相互作用势函数。根据铝-石英玻璃之间的黏附功,建立了铝-石英玻璃之间的LJ相互作用势函数,从而在保持宏观特性的同时简化和加速模拟过程。采用耦合到分子动力学的双温模型对飞秒激光作用铝和石英玻璃界面进行了小规模分子动力学模拟。飞秒激光辐照后,焊接区局部瞬时温度高达10000 K,应力高达20 GPa,出现铝原子向石英玻璃一侧扩散移动的现象。铝和石英玻璃的混合区由于高温粒子的持续碰撞而不断扩大,同时两种材料的混合区域中心向石英玻璃一侧移动,在微观上揭示了飞秒激光作用铝-石英玻璃界面皮秒时间尺度的分子动力学演化过程,为飞秒激光焊接异质材料提供理论基础。
超快激光焊接 势能函数 玻璃  分子动力学仿真 异质材料 
2023, 60(1): 0114011
吴涵 1,2,*吴福伟 1,2尚士泽 1,2杨予昊 1,2李大圣 1,2
1 中国电子科技集团公司 a.南京电子技术研究所
2 b.智能感知技术重点实验室, 江苏南京 210039
受外界因素影响, 机载合成孔径雷达 (SAR)的飞行航迹与理想状态相比往往存在偏差, 同时平台导航系统精确度有限, 故需要从回波数据中精确估计多普勒中心频率, 从而进行距离走动校正。多普勒中心估计误差决定了距离走动的校正精确度, 从而决定了合成孔径成像方位压缩效果, 是影响 SAR成像质量的关键。在机载太赫兹成像雷达系统中, 对运动补偿精确度的要求达到了亚毫米级, 从而对多普勒中心估计误差提出了更高的要求。传统的多普勒中心估计方法在正侧视或小斜视模式下具有良好的效果, 但在具有一定斜视角的模式下往往偏差较大。为了在多模式下有效完成太赫兹视频 SAR距离走动校正, 本文基于实测数据结果, 从传统的包络估计方法出发, 探究了一种改进包络估计的多普勒中心估计方法。通过比较, 本文所提出的改进包络估计方法在对太赫兹视频 SAR正侧视模式回波数据的多普勒中心估计上与另外两种传统方法都具有很高精确度, 但在本文所提方法扫描模式下对 97%的图像都作出了较为精确的估计, 精确度与鲁棒性明显高于另外两种传统方法。结果说明了本文所提出的多普勒中心估计方法具有更好的鲁棒性、更高的效率。这一工作有助于高频段 SAR多模式下的成像研究。
改进包络估计法 太赫兹视频 SAR 多普勒中心估计 距离走动校正 improved envelope estimation method THz video-SAR Doppler centroid frequency estimation range walk correction 
2022, 20(11): 1123

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