Author Affiliations
Abstract
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
Abstract
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
作者单位
摘要
1 中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033
2 中国科学院大学,北京 100049
3 中国人民解放军第32035部队,陕西 西安 710000
基于相关滤波的跟踪方法帧率高但容易发生跟踪漂移导致目标丢失。针对此问题,本文以相关滤波方法ECO-HC为基线,提出了一个用于描述图像场景变化幅度的参数D,根据实时计算该参数的值并以不同的间隔数更新模型,实现自适应更新模型在使算法以较高帧率运行的同时兼具良好的准确率,此效果在图像光照变化复杂、目标变形或被遮挡的情况下更加明显。实验结果表明,ECO-HC嵌入本文方法后,在光照变化的情况下成功率提高了1.6%,准确率提高了2.2%;在目标离开视场的情况下成功率提高了3.7%,准确率提高了3.4%。在本文实验环境中平均帧率达到60 FPS。
目标跟踪 相关滤波 相关度 模型更新策略 target tracking correlation filtering correlation model update strategy 
液晶与显示
2023, 38(8): 1118
作者单位
摘要
1 西安应用光学研究所,陕西 西安 710065
2 中国人民解放军 93427部队
反射式高分辨力光学系统是未来机载望远系统的发展方向。当光学系统工作在航空平台,由于受温度变化、振动冲击等因素的影响,光学系统将存在失调误差,需要对其进行空中校正。建立了反射镜失调量与泽尼克(Zernike)系数之间的非线性函数数学模型,采用Bhattacharyya系数方法去除相关性强的失调量,减少空中装调的复杂程度,增加可靠性。经过校正某同轴三反消像散系统,计算结果表明,系统的波像差均方根值(RMS)减小到0.025 λ,与设计值相差小于0.014 λ,满足空中装调需求。
机载光学系统 失调 空中校正 Zernike系数 airborne optical system misalignment aerial correction Zernike coefficient 
应用光学
2023, 44(4): 763
Han Wu 1†Weizhe Wang 1†Bo Hu 1Yang Li 1[ ... ]Houkun Liang 1,6,*
Author Affiliations
Abstract
1 College of Electronics and Information Engineering, Sichuan Universityhttps://ror.org/011ashp19, 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: liu-jun-1987@live.cn
5 e-mail: jyao@mail.ipc.ac.cn
6 e-mail: hkliang@scu.edu.cn
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
作者单位
摘要
西安应用光学研究所,陕西 西安 710065
某传感器侧挂结构形式的光电装置光轴一致性指标超差。通过对光电装置的光具座、传感器罩等相关零件的结构进行分析,对光具座、传感器罩的相互配合面和光具座的传感器安装面的平面度进行改进设计,提高精度,并适当增加其壁厚;着重对改进前后的光具座进行了模态分析。通过搭建试验装置对改进后的光电装置进行试验测试,对试验测试数据进行分析。试验结果表明,改进措施对提高光电装置光轴一致性有效。
光轴一致性 结构分析 试验装置 验证 optical axis consistency structural analysis test device verification 
应用光学
2023, 44(2): 239
作者单位
摘要
1 太原理工大学材料科学与工程学院,太原 030024
2 阳煤集团纳谷(山西)气凝胶科创城管理有限责任公司研发中心,阳泉 045000
煤矸石作为固体废弃物虽然被用作发电燃料、煤矿填料与建筑材料,但其利用率仍然不高,如何提高煤矸石的高值化利用率成为了目前研究的热点。本文以山西煤矸石为原料,采用一步酸溶和溶胶-凝胶法,并经过常压干燥得到了Al2O3-SiO2气凝胶粉体。在溶剂置换与改性过程中引入超声波,研究了其对气凝胶的制备与性能的影响。采用BET、XRD、SEM、FT-IR、TG-DSC及接触角测试对所得Al2O3-SiO2气凝胶粉体的结构与性能进行表征。结果表明,超声波的引入加快了反应速率,缩短了气凝胶的制备周期,所制备的Al2O3-SiO2气凝胶是一种具有纳米三维网络结构的介孔材料,堆积密度低至0.120 g/cm3,比表面积为635 m2/g,高温下收缩性小于传统水玻璃制备的SiO2气凝胶,并具有较好的疏水性。
煤矸石 活化 超声辅助 Al2O3-SiO2气凝胶 耐高温 疏水性 coal gangue activation ultrasonic assist Al2O3-SiO2 aerogel high temperature resistance hydrophobicity 
硅酸盐通报
2022, 41(2): 607
作者单位
摘要
西安应用光学研究所,陕西 西安 710065
针对提高激光**系统光束指向控制稳定精度的战术需求,设计了一款适用于光束指向快速反射镜的单轴半蝶形柔性铰链。首先,根据快速反射镜系统运动形式及功能需求,推演单轴半蝶形柔性铰链的物理模型;然后,采用基于卡氏第二定理的卡氏法简化并求解数学模型,并优化模型参数;最后进行有限元仿真与实验测试,并对单轴半蝶形柔性铰链机械谐振频率的理论计算、仿真分析以及实验测试结果进行分析比较。实验结果表明:单轴半蝶形柔性铰链工作方向机械谐振频率为165.29 Hz,满足设计指标要求。理论计算与实验测试结果相差1.3%,有限元仿真与实验测试结果相差3.2%。从而证明了单轴半蝶形柔性铰链结构形式合理,数学建模准确,为提高激光**系统光束指向控制稳定精度提供了有力的支撑。
激光** 单轴半蝶形柔性铰链 卡氏第二定理 快速反射镜 光束指向控制 laser weapon bi-axial half-butterfly flexure hinge Castigliano’s displacement theorem fast steering mirror beam steering control 
红外与激光工程
2021, 50(10): 20210118
作者单位
摘要
西安应用光学研究所,陕西 西安 710065
依据机载光电**小型化、轻量化的发展需求,设计了一套激光红外共光路光学系统。其中红外系统波段为3 μm~5 μm, F数为2,采用中波640×512 pixel的面阵探测器, 像元尺寸为15 μm×15 μm,激光发射与红外光路共用望远系统,光学系统利用立方棱镜实现方位360°和俯仰0°~90°范围的扫描,采用共光路设计可减小光路中反射镜和透镜等零件的尺寸,具有结构紧凑、质量小等特点。重点针对共光路中光学元件引入激光后向散射的问题,采用CODE V和LightTools联合优化的方法避免其影响,保证光学系统成像性能优良。
共光路 光电对抗 光学设计 红外成像 common optical path photoelectronic countermeasure optical design infrared imaging 
应用光学
2021, 42(3): 398
作者单位
摘要
1 中国人民解放军驻八四七军事代表室, 陕西 西安 710043
2 西安应用光学研究所,陕西 西安 710065
为分析不同基底材料光学窗口电磁屏蔽性能,以Kohin的等效薄膜模型为基础,考虑电磁波在材料2个界面中的多次反射和折射,得到电磁波界面反射系数,利用matlab编写程序计算相同网栅、不同厚度、不同材料的屏蔽效率曲线,分析了厚度和材料对光窗屏蔽效率的影响。为验证仿真数据的准确性,在ZnS基底上制作了周期为500 μm、线宽为15 μm,电阻≤20 Ω的测试样片,测试其在8 GHz~18 GHz频段的电磁屏蔽效能。通过对比可看出:测试与理论计算数据较符合,误差约为2 dB~4 dB,计算数据可以预估光学窗口电磁屏蔽性能,为后续的设计工作提供参考。
金属网栅 光学窗口 屏蔽效率 电磁屏蔽 metallic mesh coatings optical window shielding effectivenes electromagnetic shielding 
应用光学
2020, 41(1): 55

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