Ultrafast Science最新文献_第5页

Rapid-scan nonlinear time-resolved spectroscopy over arbitrary delay intervals 任意延迟间隔下的快速扫描非线性时间分辨光谱学

Ultrafast Science Pub Date : 2022-11-22 DOI: 10.34133/ultrafastscience.0027

T. Flory, V. Stummer, J. Pupeikis, B. Willenberg, A. Nussbaum-Lapping, F. V. Camargo, M. Barkauskas, C. Phillips, U. Keller, G. Cerullo, A. Pugžlys, A. Baltuska

{"title":"Rapid-scan nonlinear time-resolved spectroscopy over arbitrary delay intervals","authors":"T. Flory, V. Stummer, J. Pupeikis, B. Willenberg, A. Nussbaum-Lapping, F. V. Camargo, M. Barkauskas, C. Phillips, U. Keller, G. Cerullo, A. Pugžlys, A. Baltuska","doi":"10.34133/ultrafastscience.0027","DOIUrl":"https://doi.org/10.34133/ultrafastscience.0027","url":null,"abstract":"Femtosecond dual-comb lasers have revolutionized linear Fourier-domain spectroscopy by offering a rapid motion-free, precise and accurate measurement mode with easy registration of the combs beat note in the RF domain. Extensions of this technique found already application for nonlinear time-resolved spectroscopy within the energy limit available from sources operating at the full oscillator repetition rate. Here, we present a technique based on time filtering of femtosecond frequency combs by pulse gating in a laser amplifier. This gives the required boost to the pulse energy and provides the flexibility to engineer pairs of arbitrarily delayed wavelength-tunable pulses for pump-probe techniques. Using a dual-channel millijoule amplifier, we demonstrate programmable generation of both extremely short, fs, and extremely long (>ns) interpulse delays. A predetermined arbitrarily chosen interpulse delay can be directly realized in each successive amplifier shot, eliminating the massive waiting time required to alter the delay setting by means of an optomechanical line or an asynchronous scan of two free-running oscillators. We confirm the versatility of this delay generation method by measuring chi^(2) cross-correlation and chi^(3) multicomponent population recovery kinetics.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134067271","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: 1

Ultrafast Two-electron Orbital Swap in Li Initiated by Attosecond pulses 由阿秒脉冲引发的Li中超快双电子轨道交换

Ultrafast Science Pub Date : 2022-11-16 DOI: 10.34133/ultrafastscience.0028

Hui Jiang, Zhaohan Zhang, Yang Li, C. Ruiz, F. He

引用次数: 0

Ultrafast opto-mechanical terahertz modulators based on stretchable carbon nanotube thin films 基于可拉伸碳纳米管薄膜的超快光机械太赫兹调制器

Ultrafast Science Pub Date : 2022-11-14 DOI: 10.34133/ultrafastscience.0021

M. Paukov, V. Starchenko, D. Krasnikov, G. Komandin, Y. Gladush, S. Zhukov, B. Gorshunov, A. Nasibulin, A. Arsenin, V. Volkov, M. Burdanova

{"title":"Ultrafast opto-mechanical terahertz modulators based on stretchable carbon nanotube thin films","authors":"M. Paukov, V. Starchenko, D. Krasnikov, G. Komandin, Y. Gladush, S. Zhukov, B. Gorshunov, A. Nasibulin, A. Arsenin, V. Volkov, M. Burdanova","doi":"10.34133/ultrafastscience.0021","DOIUrl":"https://doi.org/10.34133/ultrafastscience.0021","url":null,"abstract":"For terahertz (THz) wave applications, tunable and rapid modulation is highly required. When studied by means of optical pump-terahertz probe spectroscopy, single-walled carbon nanotubes (SWCNTs) thin films demonstrated ultrafast carrier recombination lifetimes with a high relative change in the signal under optical excitation, making them promising candidates for high-speed modulators. Here, combination of SWCNTthin films and stretchable substrates facilitated studies of the SWCNT mechanical properties under strain,and enabled the development of a new type of an opto-mechanical modulator. By applying a certain strain to the SWCNT films, the effective sheet conductance and therefore modulation depth can be fine-tuned to optimize the designed modulator. Modulators exhibited a photoconductivity change of 3-4 orders of magnitude under the strain due to the structural modification in the SWCNT network. Stretching was used to control the THz signal with a modulation depth of around 100 % without strain and 65 % at a high strainoperation of 40 %. The sensitivity of modulators to beam polarisation is also shown, which might also come in handy for the design of a stretchable polariser. Our results give a fundamental grounding for the design of high-sensitivity stretchable devices based on SWCNT films.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115094897","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: 0

Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer 用XUV干涉仪测量氢同位素高谐波发射的阿秒延迟

Ultrafast Science Pub Date : 2022-11-09 DOI: 10.34133/2022/9834102

M. H. Mustary, Liang Xu, Wanyang Wu, N. Haram, D. Laban, Han Xu, F. He, R. Sang, I. Litvinyuk

{"title":"Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer","authors":"M. H. Mustary, Liang Xu, Wanyang Wu, N. Haram, D. Laban, Han Xu, F. He, R. Sang, I. Litvinyuk","doi":"10.34133/2022/9834102","DOIUrl":"https://doi.org/10.34133/2022/9834102","url":null,"abstract":"High-harmonic spectroscopy can access structural and dynamical information on molecular systems encoded in the amplitude and phase of high-harmonic generation (HHG) signals. However, measurement of the harmonic phase is a daunting task. Here, we present a precise measurement of HHG phase difference between two isotopes of molecular hydrogen using the advanced extreme-ultraviolet (XUV) Gouy phase interferometer. The measured phase difference is about 200 mrad, corresponding to ~3 attoseconds (1 as=10−18 s) time delay which is nearly independent of harmonic order. The measurements agree very well with numerical calculations of a four-dimensional time-dependent Schödinger equation. Numerical simulations also reveal the effects of molecular orientation and intramolecular two-center interference on the measured phase difference. This technique opens a new avenue for measuring the phase of harmonic emission for different atoms and molecules. Together with isomeric or isotopic comparisons, it also enables the observation of subtle effects of molecular structures and nuclear motion on electron dynamics in strong laser fields.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130224751","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: 3

Direct Visualization of Deforming Atomic Wavefunction in Ultraintense High-Frequency Laser Pulses 超高频激光脉冲中形变原子波函数的直接可视化

Ultrafast Science Pub Date : 2022-11-01 DOI: 10.34133/2022/9842716

Jintai Liang, Yueming Zhou, Yijie Liao, Weizhou Jiang, Min Li, P. Lu

{"title":"Direct Visualization of Deforming Atomic Wavefunction in Ultraintense High-Frequency Laser Pulses","authors":"Jintai Liang, Yueming Zhou, Yijie Liao, Weizhou Jiang, Min Li, P. Lu","doi":"10.34133/2022/9842716","DOIUrl":"https://doi.org/10.34133/2022/9842716","url":null,"abstract":"Interaction of intense laser fields with atoms distorts the bound-state electron cloud. Tracing the temporal response of the electron cloud to the laser field is of fundamental importance for understanding the ultrafast dynamics of various nonlinear phenomena of matter, but it is particularly challenging. Here, we show that the ultrafast response of the atomic electron cloud to the intense high-frequency laser pulses can be probed with the attosecond time-resolved photoelectron holography. In this method, an infrared laser pulse is employed to trigger tunneling ionization of the deforming atom. The shape of the deforming electron cloud is encoded in the hologram of the photoelectron momentum distribution. As a demonstration, by solving the time-dependent Schrödinger equation, we show that the adiabatic deforming of the bound-state electron cloud, as well as the nonadiabatic transition among the distorted states, is successfully tracked with attosecond resolution. Our work films the formation process of the metastable Kramers-Henneberger states in the intense high-frequency laser pulses. This establishes a novel approach for time-resolved imaging of the ultrafast bound-state electron processes in intense laser fields.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116809728","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: 10

Exploring Femtosecond Laser Ablation by Snapshot Ultrafast Imaging and Molecular Dynamics Simulation 利用快照超快成像和分子动力学模拟探索飞秒激光烧蚀

Ultrafast Science Pub Date : 2022-10-20 DOI: 10.34133/2022/9754131

Jiali Yao, D. Qi, Hongtao Liang, Yilin He, Yunhua Yao, T. Jia, Yang Yang, Zhenrong Sun, Shian Zhang

{"title":"Exploring Femtosecond Laser Ablation by Snapshot Ultrafast Imaging and Molecular Dynamics Simulation","authors":"Jiali Yao, D. Qi, Hongtao Liang, Yilin He, Yunhua Yao, T. Jia, Yang Yang, Zhenrong Sun, Shian Zhang","doi":"10.34133/2022/9754131","DOIUrl":"https://doi.org/10.34133/2022/9754131","url":null,"abstract":"Femtosecond laser ablation (FLA) has been playing a prominent role in precision fabrication of material because of its circumvention of thermal effect and extremely high spatial resolution. Molecular dynamics modeling, as a powerful tool to study the mechanism of femtosecond laser ablation, still lacks the connection between its simulation results and experimental observations at present. Here we combine a single-shot chirped spectral mapping ultrafast photography (CSMUP) technique in experiment and a three-dimensional two-temperature model-based molecular dynamics (3D TTM-MD) method in theory to jointly investigate the FLA process of bulky gold. Our experimental and simulated results show quite high consistency in time-resolved morphologic dynamics. According to the highly accurate simulations, the FLA process of gold at the high laser fluence is dominated by the phase explosion, which shows drastic vaporized cluster eruption and pressure dynamics, while the FLA process at the low laser fluence mainly results from the photomechanical spallation, which shows moderate temperature and pressure dynamics. This study reveals the ultrafast dynamics of gold with different ablation schemes, which has a guiding significance for the applications of FLA on various kinds of materials.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126782312","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: 5

Identification of the decay pathway of photoexcited nucleobases 光激发核碱基衰变途径的鉴定

Ultrafast Science Pub Date : 2022-09-05 DOI: 10.34133/ultrafastscience.0015

Xiangxu Mu, Ming Zhang, Jiechao Feng, Hanwei Yang, N. Medvedev, Xinyang Liu, Le Yang, Haitan Xu, Zhuguo Li

引用次数: 0

Ultrafast Science Pub Date : 2022-08-05 DOI: 10.34133/2022/9853053

Zhiqiang Yu, Lu Sun, Nan Zhang, Jianxin Wang, P. Qi, Lanjun Guo, Quan Sun, Weiwei Liu, H. Misawa

引用次数: 5

Air-Laser-Based Standoff Coherent Raman Spectrometer 基于空气激光的对峙相干拉曼光谱仪

Ultrafast Science Pub Date : 2022-08-03 DOI: 10.34133/2022/9867028

Yao Fu, Jincheng Cao, K. Yamanouchi, Huailiang Xu

{"title":"Air-Laser-Based Standoff Coherent Raman Spectrometer","authors":"Yao Fu, Jincheng Cao, K. Yamanouchi, Huailiang Xu","doi":"10.34133/2022/9867028","DOIUrl":"https://doi.org/10.34133/2022/9867028","url":null,"abstract":"Among currently available optical spectroscopic methods, Raman spectroscopy has versatile application to investigation of dynamical processes of molecules leading to chemical changes in the gas and liquid phases. However, it is still a challenge to realize an ideal standoff coherent Raman spectrometer with which both high temporal resolution and high-frequency resolution can be achieved, so that one can remotely probe chemical species in real time with high temporal resolution while monitoring the populations in their respective rovibronic levels in the frequency domain with sufficiently high spectral resolution. In the present study, we construct an air-laser-based Raman spectrometer, in which near-infrared femtosecond (fs) laser pulses at 800 nm and cavity-free picosecond N2+ air-laser pulses at 391 nm generated by the filamentation induced by the fs laser pulses are simultaneously used, enabling us to generate a hybrid ps/fs laser source at a desired standoff position for standoff surveillance of chemical and biochemical species. With this prototype Raman spectrometer, we demonstrate that the temporal evolution of the electronic, vibrational, and rotational states of N2+ and the coupling processes of the rovibrational wave packet of N2 molecules can be probed.","PeriodicalId":268204,"journal":{"name":"Ultrafast Science","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123140023","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: 50

Generating Isolated Attosecond X-Ray Pulses by Wavefront Control in a Seeded Free-Electron Laser 用波前控制在种子自由电子激光器中产生隔离阿秒x射线脉冲

Ultrafast Science Pub Date : 2022-07-30 DOI: 10.34133/2022/9812478

Yaozong Xiao, C. Feng, Bo Liu

引用次数: 7