Topical Meeting on Ultrafast Phenomena最新文献_第2页

High-Contrast Ultrafast Phase Conjugation in Semiconductor-Doped Glass 半导体掺杂玻璃的高对比度超快相位共轭

Topical Meeting on Ultrafast Phenomena Pub Date : 1986-02-01 DOI: 10.1007/978-3-642-82918-5_75

D. Cotter

引用次数: 3

Time-Domain Coherent Active Raman Spectroscopy of Free Nitrogen Jet 自由氮射流的时域相干主动拉曼光谱

Topical Meeting on Ultrafast Phenomena Pub Date : 1985-04-01 DOI: 10.1007/978-3-642-82378-7_75

S. Akhmanov, N. Koroteev, S. Magnitskii, V. B. Morozov, A. P. Tarassevich, V. Tunkin, I. Shumay

引用次数: 35

Electro-Optic Phase-Sensitive Detection of Optical Emission and Scattering 对光学发射和散射的电光相位敏感探测

Topical Meeting on Ultrafast Phenomena Pub Date : 1985-02-15 DOI: 10.1063/1.95917

A. Genack

引用次数: 4

Femtosecond Laser Interaction with Metallic Tungsten and Nonequilibrium Electron and Lattice Temperatures 飞秒激光与金属钨的相互作用及非平衡电子和晶格温度

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-11-05 DOI: 10.1103/PHYSREVLETT.53.1837

J. Fujimoto, Junwei Liu, E. Ippen, N. Bloembergen

{"title":"Femtosecond Laser Interaction with Metallic Tungsten and Nonequilibrium Electron and Lattice Temperatures","authors":"J. Fujimoto, Junwei Liu, E. Ippen, N. Bloembergen","doi":"10.1103/PHYSREVLETT.53.1837","DOIUrl":"https://doi.org/10.1103/PHYSREVLETT.53.1837","url":null,"abstract":"Multiphoton photoelectron emission from metals has been the subject of experimental and theoretical investigation for several years [1]. The development of high intensity ultrashort pulse laser sources has made possible the extension of these studies into the picosecond time regime [2,3]. For intense pulses of short enough duration, it has been postulated that a transient nonequilibrium between the electrons and phonons may be generated [4]. This phenomenon has been termed anomalous heating and is predicted when the laser pulse durations are comparable to or shorter than the electron-phonon energy relaxation time. Because of the smaller heat capacity of the electron gas, heating of the electrons to temperatures in excess of the lattice melting temperature would then be possible. Previous experimental investigations of photoelectron emission have been performed with picosecond pulses in attempts to observe anomalous heating [2,3]. To date, none have achieved the temporal resolution necessary for such an observation. However, very recently, indirect eveidence of transient heating has been reported using picosecond reflectivity measurements in copper [5].","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124623814","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: 429

Cerenkov Radiation from Femtosecond Optical Pulses in Electro-Optic Media 电光介质中飞秒光脉冲的切伦科夫辐射

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-10-15 DOI: 10.1103/PHYSREVLETT.53.1555

D. Auston, K. Cheung, J. Valdmanis, D. Kleinman

{"title":"Cerenkov Radiation from Femtosecond Optical Pulses in Electro-Optic Media","authors":"D. Auston, K. Cheung, J. Valdmanis, D. Kleinman","doi":"10.1103/PHYSREVLETT.53.1555","DOIUrl":"https://doi.org/10.1103/PHYSREVLETT.53.1555","url":null,"abstract":"It was recently suggested that under suitable conditions, the propagation of femtosecond optical pulses in electro-optic materials should be accompanied by the radiation of an extremely fast electromagnetic transient1,2. This phenomenon, which arises from the inverse electro-optic effect3, produces a Cerenkov cone of pulsed radiation having a duration of approximately one cycle and a frequency in the THz range. Although closely resembling the classical Cerenkov radiation from relativistic charged particles in dielectric media, the physical basis for this effect has some unique distinguishing features. Most important, it is a nonlinear optical effect, arising from a second order nonlinear polarization, and consequently requires a lack of inversion symmetry in the host material. Also, the charge state of the effective source is neutral, being a dipole moment, rather than a point charge. The velocity of the source, however, does move at a velocity which exceeds the radiation velocity due to the additional contribution to the low frequency dielectric permittivity from the infrared lattice vibrations. This is expected to produce a characteristic cone of radiation in the form of a shock wave. Unlike classical Cerenkov radiation, however, the radiation source is spatially extended, being proportional to the intensity envelope of the optical pulse. Consequently the details of the radiation field are expected to depend sensitively on both the duration and beam waist of the optical pulse. A discussion of these effects, based on an analysis of this phenomenon, is given in references 1 and 2.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132781292","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: 512

Excited-State Proton-Transfer Reactions in 1-Naphthol 1-萘酚的激发态质子转移反应

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-07-01 DOI: 10.1007/978-3-642-82378-7_98

S. Webb, S. Yeh, L. Philips, M. Tolbert, J. Clark

引用次数: 1

Picosecond Time-Resolved Spectroscopy of Electronically Excited tris (2,2'-bipyridine)Ruthenium(II) Dichloride 电子激发三(2,2'-联吡啶)钌(II)二氯化的皮秒时间分辨光谱

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-07-01 DOI: 10.1007/978-3-642-82378-7_104

L. Philips, W. T. Brown, S. Webb, S. Yeh, J. Clark

引用次数: 2

Picosecond Pulses from Future Synchrotron-Radiation Sources 未来同步辐射源的皮秒脉冲

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-07-01 DOI: 10.1007/978-3-642-82378-7_17

R. Sah, D. Attwood, A. P. Sabersky

引用次数: 0

Subpicosecond Electro-Optic Sampling Using Coplanar Strip Transmission Lines 利用共面带状传输线进行亚皮秒电光采样

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-06-19 DOI: 10.1007/978-3-642-82378-7_108

K. Meyer, G. Mourou

引用次数: 73

Time-Resolved Laser-Induced Phase Transformation in Aluminum 铝中时间分辨激光诱导相变

Topical Meeting on Ultrafast Phenomena Pub Date : 1984-06-18 DOI: 10.1557/PROC-35-87

S. Williamson, G. Mourou, J. C. Li

{"title":"Time-Resolved Laser-Induced Phase Transformation in Aluminum","authors":"S. Williamson, G. Mourou, J. C. Li","doi":"10.1557/PROC-35-87","DOIUrl":"https://doi.org/10.1557/PROC-35-87","url":null,"abstract":"Phase transformation in condensed matter is an important area of study in solid state physics since it relates to the genesis and evolution of new microstructure. The mechanisms responsible in such critical phenomena are still not fully understood. Previous experimental information has left unmeasured such important parameters as the minimum number of nuclei and their common critical radius for a transformation to occur as well as the interphase velocity. Several probe techniques have now been developed to time-resolve phase transformations in semiconductors during laser annealing. However, most of these probes (eg. electrical conductivity,1,2 optical reflection,3,4 optical transmission,5 Raman scattering,6 and time of flight mass spectrometry7) supply no direct information about the atomic structure of the material. Probing the structure can reveal when and to what degree a system melts as it is defined by degradation in the long range order of the lattice. True structural probes based on x-ray8 and low energy electron9 diffraction and EXAFS10 with nanosecond time resolution have been developed offering fresh insight into both the bulk and surface dynamics of material structure. Also, a subpicosecond probe based on structural dependent second harmonic generation11 has been demonstrated. But at present, only the technique of picosecond electron diffraction12 can produce an unambiguous picture of the structure on the picosecond timescale. In this letter we report on the results of using this probe to directly observe the laser-induced melting of aluminum.","PeriodicalId":371790,"journal":{"name":"Topical Meeting on Ultrafast Phenomena","volume":"202 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115293074","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: 131