Ultrafast Science最新文献_第6页

Birefringence-Managed Normal-Dispersion Fiber Laser Delivering Energy-Tunable Chirp-Free Solitons 双折射管理的正色散光纤激光器提供能量可调谐的无啁啾孤子

Ultrafast Science Pub Date : 2022-07-30 DOI: 10.34133/2022/9760631

D. Mao, Zhiwen He, Qun Gao, Chao Zeng, L. Yun, Yueqing Du, Hua Lu, Zhipei Sun, Jianlin Zhao

{"title":"Birefringence-Managed Normal-Dispersion Fiber Laser Delivering Energy-Tunable Chirp-Free Solitons","authors":"D. Mao, Zhiwen He, Qun Gao, Chao Zeng, L. Yun, Yueqing Du, Hua Lu, Zhipei Sun, Jianlin Zhao","doi":"10.34133/2022/9760631","DOIUrl":"https://doi.org/10.34133/2022/9760631","url":null,"abstract":"Chirp-free solitons have been mainly achieved with anomalous-dispersion fiber lasers by the balance of dispersive and nonlinear effects, and the single-pulse energy is constrained within a relatively small range. Here, we report a class of chirp-free pulse in normal-dispersion erbium-doped fiber lasers, termed birefringence-managed soliton, in which the birefringence-related phase-matching effect dominates the soliton evolution. Controllable harmonic mode locking from 5 order to 85 order is obtained at the same pump level of ~10 mW with soliton energy fully tunable beyond ten times, which indicates a new birefringence-related soliton energy law, which fundamentally differs from the conventional soliton energy theorem. The unique transformation behavior between birefringence-managed solitons and dissipative solitons is directly visualized via the single-shot spectroscopy. The results demonstrate a novel approach of engineering fiber birefringence to create energy-tunable chirp-free solitons in normal-dispersion regime and open new research directions in fields of optical solitons, ultrafast lasers, and their applications.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123803490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Attosecond Optical and Ramsey-Type Interferometry by Postgeneration Splitting of Harmonic Pulse 谐波脉冲产生后分裂的阿秒光学和拉姆齐型干涉测量

Ultrafast Science Pub Date : 2022-06-24 DOI: 10.34133/2022/9858739

Takuya Matsubara, Y. Nabekawa, K. Ishikawa, K. Yamanouchi, K. Midorikawa

{"title":"Attosecond Optical and Ramsey-Type Interferometry by Postgeneration Splitting of Harmonic Pulse","authors":"Takuya Matsubara, Y. Nabekawa, K. Ishikawa, K. Yamanouchi, K. Midorikawa","doi":"10.34133/2022/9858739","DOIUrl":"https://doi.org/10.34133/2022/9858739","url":null,"abstract":"Time domain Ramsey-type interferometry is useful for investigating spectroscopic information of quantum states in atoms and molecules. The energy range of the quantum states to be observed with this scheme has now reached more than 20 eV by resolving the interference fringes with a period of a few hundred attoseconds. This attosecond Ramsey-type interferometry requires the irradiation of a coherent pair of extreme ultraviolet (XUV) light pulses, while all the methods used to deliver the coherent XUV pulse pair until now have relied on the division of the source of an XUV pulse in two before the generation. In this paper, we report on a novel technique to perform attosecond Ramsey-type interferometry by splitting an XUV high-order harmonic (HH) pulse of a sub-20 fs laser pulse after its generation. By virtue of the postgeneration splitting of the HH pulse, we demonstrated that the optical interference emerging at the complete temporal overlap of the HH pulse pair seamlessly continued to the Ramsey-type electronic interference in a helium atom. This technique is applicable for studying the femtosecond dephasing dynamics of electronic wavepackets and exploring the ultrafast evolution of a cationic system entangled with an ionized electron with sub-20 fs resolution.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121400652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

13.4 fs, 0.1 Hz OPCPA Front End for the 100 PW-Class Laser Facility 用于100pw级激光设备的13.4 fs, 0.1 Hz OPCPA前端

Ultrafast Science Pub Date : 2022-06-18 DOI: 10.34133/2022/9894358

Xinliang Wang, Xingyan Liu, Xiaoming Lu, Junchi Chen, Yingbing Long, Wenkai Li, Haidong Chen, Xun Chen, P. Bai, Yanyan Li, Yujie Peng, Yanqi Liu, F. Wu, Cheng Wang, Zhaoyang Li, Yi Xu, X. Liang, Y. Leng, Ruxin Li

引用次数: 22

Probing Molecular Frame Wigner Time Delay and Electron Wavepacket Phase Structure of CO Molecule 探测CO分子的分子框架、维格纳时延和电子波包相位结构

Ultrafast Science Pub Date : 2022-05-26 DOI: 10.34133/2022/9802917

Zhenning Guo, Peipei Ge, Yiqi Fang, Yan Dou, Xiaoyang Yu, Jiguo Wang, Q. Gong, Yunquan Liu

{"title":"Probing Molecular Frame Wigner Time Delay and Electron Wavepacket Phase Structure of CO Molecule","authors":"Zhenning Guo, Peipei Ge, Yiqi Fang, Yan Dou, Xiaoyang Yu, Jiguo Wang, Q. Gong, Yunquan Liu","doi":"10.34133/2022/9802917","DOIUrl":"https://doi.org/10.34133/2022/9802917","url":null,"abstract":"The time delay of photoelectron emission serves as a fundamental building block to understand the ultrafast electron emission dynamics in strong-field physics. Here, we study the photoelectron angular streaking of CO molecules by using two-color (400+800 nm) corotating circularly polarized fields. By coincidently measuring photoelectrons with the dissociative ions, we present molecular frame photoelectron angular distributions with respect to the instantaneous driving electric field signatures. We develop a semiclassical nonadiabatic molecular quantum-trajectory Monte Carlo (MO-QTMC) model that fully captures the experimental observations and further ab initio simulations. We disentangle the orientation-resolved contribution of the anisotropic ionic potential and the molecular orbital structure on the measured photoelectron angular distributions. Furthermore, by analyzing the photoelectron interference patterns, we extract the sub-Coulomb-barrier phase distribution of the photoelectron wavepacket and reconstruct the orientation- and energy-resolved Wigner time delay in the molecular frame. Holographic angular streaking with bicircular fields can be used for probing polyatomic molecules in the future.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"306 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123091586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Low-Energy Protons in Strong-Field Dissociation of H2+ via Dipole-Transitions at Large Bond Lengths 大键长下偶极跃迁在H2+强场解离中的低能质子

Ultrafast Science Pub Date : 2022-05-05 DOI: 10.34133/2022/9863548

Shengzhe Pan, Chenxi Hu, Zhaohan Zhang, P. Lu, Chenxu Lu, Lianrong Zhou, Jiawei Wang, Fenghao Sun, Junjie Qiang, Haiyang Li, H. Ni, X. Gong, F. He, Jian Wu

{"title":"Low-Energy Protons in Strong-Field Dissociation of H2+ via Dipole-Transitions at Large Bond Lengths","authors":"Shengzhe Pan, Chenxi Hu, Zhaohan Zhang, P. Lu, Chenxu Lu, Lianrong Zhou, Jiawei Wang, Fenghao Sun, Junjie Qiang, Haiyang Li, H. Ni, X. Gong, F. He, Jian Wu","doi":"10.34133/2022/9863548","DOIUrl":"https://doi.org/10.34133/2022/9863548","url":null,"abstract":"More than ten years ago, the observation of the low-energy structure in the photoelectron energy spectrum, regarded as an “ionization surprise,” has overthrown our understanding of strong-field physics. However, the similar low-energy nuclear fragment generation from dissociating molecules upon the photon energy absorption, one of the well-observed phenomena in light-molecule interaction, still lacks an unambiguous mechanism and remains mysterious. Here, we introduce a time-energy-resolved manner using a multicycle near-infrared femtosecond laser pulse to identify the physical origin of the light-induced ultrafast dynamics of molecules. By simultaneously measuring the bond-stretching times and photon numbers involved in the dissociation of H2+ driven by a polarization-skewed laser pulse, we reveal that the low-energy protons (below 0.7 eV) are produced via dipole-transitions at large bond lengths. The observed low-energy protons originate from strong-field dissociation of high vibrational states rather than the low ones of H2+ cation, which is distinct from the well-accepted bond-softening picture. Further numerical simulation of the time-dependent Schrödinger equation unveils that the electronic states are periodically distorted by the strong laser field, and the energy gap between the field-dressed transient electronic states may favor the one- or three-photon transitions at the internuclear distance larger than 5 a.u. The time-dependent scenario and our time-energy-resolved approach presented here can be extended to other molecules to understand the complex ultrafast dynamics.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"56 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113987515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

High-Sensitivity Gas Detection with Air-Lasing-Assisted Coherent Raman Spectroscopy 空气激光辅助相干拉曼光谱的高灵敏度气体检测

Ultrafast Science Pub Date : 2022-04-08 DOI: 10.34133/2022/9761458

Zhihao Zhang, Fangbo Zhang, Bo Xu, Hongqiang Xie, B. Fu, Xu Lu, Ning Zhang, Shupeng Yu, J. Yao, Ya Cheng, Zhi‐zhan Xu

{"title":"High-Sensitivity Gas Detection with Air-Lasing-Assisted Coherent Raman Spectroscopy","authors":"Zhihao Zhang, Fangbo Zhang, Bo Xu, Hongqiang Xie, B. Fu, Xu Lu, Ning Zhang, Shupeng Yu, J. Yao, Ya Cheng, Zhi‐zhan Xu","doi":"10.34133/2022/9761458","DOIUrl":"https://doi.org/10.34133/2022/9761458","url":null,"abstract":"Remote or standoff detection of greenhouse gases, air pollutants, and biological agents with innovative ultrafast laser technology attracts growing interests in recent years. Hybrid femtosecond/picosecond coherent Raman spectroscopy is considered as one of the most versatile techniques due to its great advantages in terms of detection sensitivity and chemical specificity. However, the simultaneous requirement for the femtosecond pump and the picosecond probe increases the complexity of optical system. Herein, we demonstrate that air lasing naturally created inside a filament can serve as an ideal light source to probe Raman coherence excited by the femtosecond pump, producing coherent Raman signal with molecular vibrational signatures. The combination of pulse self-compression effect and air lasing action during filamentation improves Raman excitation efficiency and greatly simplifies the experimental setup. The air-lasing-assisted Raman spectroscopy was applied to quantitatively detect greenhouse gases mixed in air, and it was found that the minimum detectable concentrations of CO2 and SF6 can reach 0.1% and 0.03%, respectively. The ingenious designs, especially the optimization of pump-seed delay and the choice of perpendicular polarization, ensure a high detection sensitivity and signal stability. Moreover, it is demonstrated that this method can be used for simultaneously measuring CO2 and SF6 gases and distinguishing 12CO2 and 13CO2. The developed scheme provides a new route for high-sensitivity standoff detection and combustion diagnosis.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122809238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 53

Bessel Terahertz Pulses from Superluminal Laser Plasma Filaments 超光速激光等离子体细丝的贝塞尔太赫兹脉冲

Ultrafast Science Pub Date : 2022-03-02 DOI: 10.34133/2022/9870325

Zhelin Zhang, Jiayang Zhang, Yanping Chen, Tianhao Xia, Linzheng Wang, B. Han, Feng He, Z. Sheng, J Zhang

引用次数: 18

Nature-Inspired Superwettability Achieved by Femtosecond Lasers 由飞秒激光实现的自然启发的超润湿性

Ultrafast Science Pub Date : 2022-02-08 DOI: 10.34133/2022/9895418

Jiale Yong, Qing Yang, Xun Hou, F. Chen

{"title":"Nature-Inspired Superwettability Achieved by Femtosecond Lasers","authors":"Jiale Yong, Qing Yang, Xun Hou, F. Chen","doi":"10.34133/2022/9895418","DOIUrl":"https://doi.org/10.34133/2022/9895418","url":null,"abstract":"Wettability is one of a solid surface’s fundamental physical and chemical properties, which involves a wide range of applications. Femtosecond laser microfabrication has many advantages compared to traditional laser processing. This technology has been successfully applied to control the wettability of material surfaces. This review systematically summarizes the recent progress of femtosecond laser microfabrication in the preparation of various superwetting surfaces. Inspired by nature, the superwettabilities such as superhydrophilicity, superhydrophobicity, superamphiphobicity, underwater superoleophobicity, underwater superaerophobicity, underwater superaerophilicity, slippery liquid-infused porous surface, underwater superpolymphobicity, and supermetalphobicity are obtained on different substrates by the combination of the femtosecond laser-induced micro/nanostructures and appropriate chemical composition. From the perspective of biomimetic preparation, we mainly focus the methods for constructing various kinds of superwetting surfaces by femtosecond laser and the relationship between different laser-induced superwettabilities. The special wettability of solid materials makes the femtosecond laser-functionalized surfaces have many practical applications. Finally, the significant challenges and prospects of this field (femtosecond laser-induced superwettability) are discussed.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"405 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126680750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 47

Distributed Kerr Lens Mode-Locked Yb:YAG Thin-Disk Oscillator 分布式克尔透镜锁模Yb:YAG薄盘振荡器

Ultrafast Science Pub Date : 2022-01-04 DOI: 10.34133/2022/9837892

Jinwei Zhang, Markus Pӧtzlberger, Qing Wang, J. Brons, M. Seidel, D. Bauer, D. Sutter, V. Pervak, A. Apolonski, K. Mak, V. Kalashnikov, Zhiyi Wei, F. Krausz, O. Pronin

引用次数: 6

Transient Superdiffusion of Energetic Carriers in Transition Metal Dichalcogenides Visualized by Ultrafast Pump-Probe Microscopy 用超快泵探针显微镜观察过渡金属二硫族化合物中含能载流子的瞬态超扩散

Ultrafast Science Pub Date : 2022-01-01 DOI: 10.34133/ultrafastscience.0002

Yunlong Zhou, Xiao-Ze Li, Qian-Ni Zhou, Ren-Hao Xing, Yan Zhang, Ben-Feng Bai, Hong‐Hua Fang, Hongjiang Sun

{"title":"Transient Superdiffusion of Energetic Carriers in Transition Metal Dichalcogenides Visualized by Ultrafast Pump-Probe Microscopy","authors":"Yunlong Zhou, Xiao-Ze Li, Qian-Ni Zhou, Ren-Hao Xing, Yan Zhang, Ben-Feng Bai, Hong‐Hua Fang, Hongjiang Sun","doi":"10.34133/ultrafastscience.0002","DOIUrl":"https://doi.org/10.34133/ultrafastscience.0002","url":null,"abstract":"\u0000 Because of the strong Coulomb interaction and quantum confinement effect, 2-dimensional transition metal dichalcogenides possess a stable excitonic population. To realize excitonic device applications, such as excitonic circuits, switches, and transistors, it is of paramount importance for understanding the optical properties of transition metal dichalcogenides. Furthermore, the strong quantum confinement in 2-dimensional space introduces exotic properties, such as enhanced phonon bottlenecking effect, many-body interaction of excitons, and ultrafast nonequilibrium exciton–exciton annihilation. Exciton diffusion is the primary energy dissipation process and a working horse in excitonic devices. In this work, we investigated time-resolved exciton propagation in monolayer semiconductors of WSe\u0000 2\u0000 , MoWSe\u0000 2\u0000 , and MoSe\u0000 2\u0000 , with a home-built femtosecond pump-probe microscope. We observed ultrafast exciton expansion behavior with an equivalent diffusivity of up to 502 cm\u0000 2\u0000 s\u0000 −1\u0000 at the initial delay time, followed by a slow linear diffusive regime (20.9 cm\u0000 2\u0000 s\u0000 −1\u0000 ) in the monolayer WSe\u0000 2\u0000 . The fast expansion behavior is attributed to energetic carrier-dominated superdiffusive behavior. We found that in the monolayers MoWSe\u0000 2\u0000 and MoSe\u0000 2\u0000 , the energetic carrier-induced exciton expansion is much more effective, with diffusivity up to 668 and 2295 cm\u0000 2\u0000 s\u0000 −1\u0000 , respectively. However, the “cold” exciton transport is trap limited in MoWSe\u0000 2\u0000 and MoSe\u0000 2\u0000 , leading to negative diffusion behavior at later time. Our findings are helpful to better understand the ultrafast nonlinear diffusive behavior in strongly quantum-confined systems. It may be harnessed to break the limit of conventional slow diffusion of excitons for advancing more efficient and ultrafast optoelectronic devices.\u0000","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123624680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2