Eighth International Conference on Ultrafast Phenomena最新文献

{"title":"Femtosecond Spontaneous Fluorescence Studies of Photosynthetic Bacterial Reaction Centers.","authors":"X. Xie, M. Du, S. Rosenthal, T. Dimagno, M. E. Schmidt, J. Norris, G. Fleming","doi":"10.1364/up.1992.mc9","DOIUrl":"https://doi.org/10.1364/up.1992.mc9","url":null,"abstract":"The mechanism of the initial electron transfer step in the reaction center of photosynthetic bacteria has been the subject of intense study over the past 10 years. This initial step is ultrafast, occurring in about 3 ps at room temperature [1]. As the understanding of the reaction center improves the need arises for more precise kinetic data. In particular, questions arise to the exponentiality of the observed kinetic signals [2], the possibility of differing behavior at different wavelengths [3], the existence of oscillatory components [2], and of spectral shifts accompanying the excitation and subsequent electron transfer processes. We measured the spontaneous fluorescence decay of P* in Rb. Sphaeroidis R26, Rb. Capsulatus, and mutantsof Rb. Capsulatus using the upconversion technique. For all samples QA was chemically reduced with the exception of the Rb. Sphaeroidis R26 sample for which the quinone was removed. The Rb. Spaeroidis R26 quinone removed measurements with both direct excitation of P at 850 nm and indirect excitation through internal conversion from PQX and energy transfer from BChl excited at 608 nm. All other samples were excited @ 850 nm. Excitation at 608 nm was provided by an antiresonant ring dye laser amplified at 100 Khz by a YAG regen yielding 60 fs pulses [4]. Experiments using 850 nm excitation were performed with a Coherent Mira 900 F Ti sapphire laser operating at 76 MHz with 95 fs pulses [5]. The instrument response functions at 940 nm emission for the two apparatus is ~180 fs. A typical data set is shown in Figure 1. All the samples showed nonexponential decay (see Figure 1) which could be adequately fit by a sum of two exponentials. The shorter component compares very well with the single components determined by stimulated emission [6]. However, the improved dynamic range and absence of other components (excited state absorption and ground state bleaching) make the nonexponentiality very clear. With 850 nm excitation we were unable to detect a risetime for fluorescence at 940 nm. With 610 nm excitation a risetime of 200 fs is apparent (Figure 2). This risetime results from a combination of energy transfer from the accessory pigments and electronic relaxation with the special pair manifold.","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115595318","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}

{"title":"Additive Pulse Modelocking and Kerr Lens Modelocking","authors":"H. Haus","doi":"10.1007/978-3-642-84910-7_1","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_1","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114485012","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}

{"title":"Picosecond Pseudomorphic AlGaAs/InGaAs MODFET Large-Signal Switching Measured by Electro-Optic Sampling","authors":"M. K. Jackson, M. Frankel, J. Whitaker, G. Mourou, D. Hulin, A. Antonetti, M. V. Hove, W. Raedt, P. Crozat, H. Hafdallah","doi":"10.1007/978-3-642-84910-7_160","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_160","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114539166","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}

{"title":"All solid femtosecond oscillator-amplifier laser chain with 100 mJ per pulse","authors":"C. Blanc, G. Grillon, J. Chambaret, G. Boyer, M. Franco, A. Mysyrowicz, A. Antonetti","doi":"10.1007/978-3-642-84910-7_74","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_74","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115156265","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}

{"title":"Field-Enhanced GaAs/AlGaAs Waveguide Saturable Absorbers","authors":"J. Karin, D. Derickson, R. Helkey, J. Bowers, R. Thornton","doi":"10.1007/978-3-642-84910-7_152","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_152","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116068997","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}

{"title":"Dephasing of Excitonic Transition of J-Aggregates Measured by Time-resolved Resonance CARS","authors":"V. F. Kamaloyl, R. Inaba, K. Yoshihara","doi":"10.1364/up.1992.fc3","DOIUrl":"https://doi.org/10.1364/up.1992.fc3","url":null,"abstract":"J-aggregates are the subject of great interest due to high values of optical susceptibilities of intensive excitonic resonance, originated from delocalization of electronic excitation in molecular aggregate. In [1,2] resonant enhancement of third-order susceptibiltity of J-aggregates of pseudoisocyanine (PIC) solutions was observed. The dephasing time of excitonic transition of PIC J-aggregate solutions was determined in [3] as 16 ps by low-temperature photon echo, and T2=0.17 ps at room temperature by measuring the dispersion of nonlinear susceptibility in the process of four-wave mixing [2].","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"331 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116234628","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}

{"title":"Kilovolt X-Ray Emission from Femtosecond Laser-Produced Plasmas","authors":"G. Jenke, H. Schüler, T. Engers, D. Linde, I. Uschmann, E. Förster, K. Gäbel","doi":"10.1007/978-3-642-84910-7_84","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_84","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114900981","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}

{"title":"Internal dynamics of macromolecules : Simulations of motion in proteins","authors":"M. Karplus","doi":"10.1364/up.1992.thb1","DOIUrl":"https://doi.org/10.1364/up.1992.thb1","url":null,"abstract":"The internal motions of proteins will be discussed. Detailed atom-bases simulations of the native conformation space will be supplemented by simplified models for the full conformation space involved in protein folding.","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126954693","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}

{"title":"Experimental analysis of gain modulation in Subpicosecond (0.45 Ps) Mode-Locked Laser Diodes","authors":"N. Stelmakh, J. Lourtioz, D. Pascal","doi":"10.1007/978-3-642-84910-7_66","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_66","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127104592","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}

{"title":"Femtosecond Luminescence Spectroscopy of Indium Phosphide","authors":"E. Fazio, G. Gale","doi":"10.1007/978-3-642-84910-7_137","DOIUrl":"https://doi.org/10.1007/978-3-642-84910-7_137","url":null,"abstract":"","PeriodicalId":242710,"journal":{"name":"Eighth International Conference on Ultrafast Phenomena","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127482774","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}