Bibliografías temáticas / Femtosecond Upconversion

Literatura académica sobre el tema "Femtosecond Upconversion"

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Publicado: 7 de septiembre de 2023

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Artículos de revistas sobre el tema "Femtosecond Upconversion"

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Modak, Monami Das, Ganesh Damarla, Somedutta Maity, Anil K. Chaudhary y Pradip Paik. "Self-assembled pearl-necklace patterned upconverting nanocrystals with highly efficient blue and ultraviolet emission: femtosecond laser based upconversion properties". RSC Advances 9, n.º 65 (2019): 38246–56. http://dx.doi.org/10.1039/c9ra06389g.

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Schanz, R., S. A. Kovalenko, V. Kharlanov y N. P. Ernsting. "Broad-band fluorescence upconversion for femtosecond spectroscopy". Applied Physics Letters 79, n.º 5 (30 de julio de 2001): 566–68. http://dx.doi.org/10.1063/1.1387257.

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A. S., Ashik, Callum F. O’Donnell, S. Chaitanya Kumar, M. Ebrahim-Zadeh, P. Tidemand-Lichtenberg y C. Pedersen. "Mid-infrared upconversion imaging using femtosecond pulses". Photonics Research 7, n.º 7 (24 de junio de 2019): 783. http://dx.doi.org/10.1364/prj.7.000783.

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Kee, Tak W., Ramkrishna Adhikary, Philip J. Carlson, Prasun Mukherjee y Jacob W. Petrich. "Femtosecond Fluorescence Upconversion Investigations on the Excited-State Photophysics of Curcumin". Australian Journal of Chemistry 64, n.º 1 (2011): 23. http://dx.doi.org/10.1071/ch10417.

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The demonstration of curcumin as a photodynamic therapy agent has generated a high level of interest in understanding the photoinduced chemical and physical properties of this naturally occurring, yellow-orange medicinal compound. Important photophysical processes that may be related to photodynamic therapy effects including excited-state intramolecular hydrogen atom transfer (ESIHT) occur within the femtosecond to picosecond time scales. Femtosecond fluorescence upconversion spectroscopy has sufficient time resolution to resolve and investigate these important photophysical processes. In this review, recent advances in using femtosecond fluorescence upconversion to reveal ultrafast solvation and ESIHT of curcumin are presented. The excited-state photophysics of curcumin has been investigated in alcohols and micellar solutions. The results of curcumin in methanol and ethylene glycol reveal the presence of two decay components in the excited-state kinetics with time scales of 12–20 ps and ∼100 ps. Similarly, in a micellar solution, biphasic kinetics are present with the fast decay component having a time constant of 3–8 ps, the slow decay component 50–80 ps. Deuteration of curcumin in both media leads to a pronounced isotope effect in the slow decay component, which suggests that ESIHT is an important photophysical process on this time scale. The results of multiwavelength fluorescence upconversion studies show that the fast component in the excited-state kinetics is due to ultrafast solvation. These advances form a part of the continuing efforts to elucidate the photodynamic therapy properties of curcumin.
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Ma, Shushu, Haiyuan Wei, Hai Zhu, Francis Chi-Chung Ling, Xianghu Wang y Shichen Su. "Higher-Order Multiphoton Absorption Upconversion Lasing Based on ZnO/ZnMgO Multiple Quantum Wells". Nanomaterials 12, n.º 17 (4 de septiembre de 2022): 3073. http://dx.doi.org/10.3390/nano12173073.

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In the progress of nonlinear optics, multiphoton absorption (MPA) upconversion lasing enables many vital applications in bioimaging, three-dimensional optical data storage, and photodynamic therapy. Here, efficient four-photon absorption upconversion lasing from the ZnO/ZnMgO multiple quantum wells (MQWs) at room temperature is realized. Moreover, the MPA upconversion lasing and third-harmonic generation peak generated in the MQWs under the excitation of a femtosecond (fs) laser pulse were observed concurrently, and the essential differences between each other were studied comprehensively. Compared with the ZnO film, the upconversion lasing peak of the ZnO/ZnMgO MQWs exhibits a clear blue shift. In addition, the four-photon absorption upconversion photoluminescence (PL) intensity was enhanced in the MQWs/Au nanoparticles (NPs) by the metal-localized surface plasmons (LSPs). The work paves the way for short-wavelength lasers by taking advantage of the high stability and large exciton binding energy of the MQWs’ structures.
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Kuzucu, Onur, Franco N. C. Wong, Sunao Kurimura y Sergey Tovstonog. "Time-resolved single-photon detection by femtosecond upconversion". Optics Letters 33, n.º 19 (30 de septiembre de 2008): 2257. http://dx.doi.org/10.1364/ol.33.002257.

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Li, Ruonan, Lifei Sun, Yangjian Cai, Yingying Ren, Hongliang Liu, Mark D. Mackenzie y Ajoy K. Kar. "Near-infrared lasing and tunable upconversion from femtosecond laser inscribed Nd,Gd:CaF2 waveguides". Chinese Optics Letters 19, n.º 8 (2021): 081301. http://dx.doi.org/10.3788/col202119.081301.

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Bennett, C. V. y B. H. Kolner. "Upconversion time microscope demonstrating 103× magnification of femtosecond waveforms". Optics Letters 24, n.º 11 (1 de junio de 1999): 783. http://dx.doi.org/10.1364/ol.24.000783.

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Gerecke, Mario, Genaro Bierhance, Michael Gutmann, Nikolaus P. Ernsting y Arnulf Rosspeintner. "Femtosecond broadband fluorescence upconversion spectroscopy: Spectral coverage versus efficiency". Review of Scientific Instruments 87, n.º 5 (mayo de 2016): 053115. http://dx.doi.org/10.1063/1.4948932.

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Zhao, Lijuan, J. Luis Pérez Lustres, Vadim Farztdinov y Nikolaus P. Ernsting. "Femtosecond fluorescence spectroscopy by upconversion with tilted gate pulses". Phys. Chem. Chem. Phys. 7, n.º 8 (2005): 1716–25. http://dx.doi.org/10.1039/b500108k.

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Tesis sobre el tema "Femtosecond Upconversion"

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Schanz, Hans Roland. "Femtosecond broadbandfluorescence upconversion". Doctoral thesis, [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964914964.

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Venugopal, Karunakaran. "Femtosecond solvation, excited state dynamics, and photophysical properties of chromophores used in polynucleic acids". Doctoral thesis, [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983550263.

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Maffeis, Valentin. "Caractérisation et intégration de nouveaux systèmes donneur-accepteur dans des cellules photovoltaïques". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS376/document.

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Ce travail de thèse porte sur l’étudephoto-physique de chromophores donneur-π-accepteur utilisés dans les cellules solaires àcolorant. Après photo-excitation, ces moléculessubissent des processus de transfert de chargeintramoléculaire (ICT), de solvatation etd’injection de charges qui se déroulent dans ledomaine temporel de la picoseconde. Or touterelaxation énergétique de l’état excité diminue lacinétique de l’injection de charges.Des mesures de spectroscopie stationnaire et defluorescence résolue en temps (de la femto- à lananoseconde) ont permis de résoudre ladynamique de relaxation de ces colorants ensolution, sur films mésoporeux et en cellulescomplètes.Les dynamiques de relaxation spectrale etd’inhibition de l’intensité de fluorescence del’état excité ont pu être caractériséesindépendamment et mettent en évidence unchangement d’état électronique à l’état excité.Les trois colorants étudiés évoluent vers un étatà transfert de charge (état CT). Un tel étatinteragit fortement avec son environnement.Afin d’étudier l’injection de charge dans lesoxydes mésoporeux semi-conducteurs, unmontage expérimental de fluorescence résolue entemps destiné à l’étude de systèmes opaques etdiffusifs a été réalisé et est décrit dans cette thèse.Ce montage possède une résolution temporelled’environ 300 fs.Les résultats mettent en évidence la présenced’une compétition entre l’injection de charges etla relaxation de l’état excité dans les cellulescomplètes
This thesis deals with thephotophysical study of donor-π-acceptorchromophores used in dye sensitized solar cells.After photo-excitation, these molecules undergointramolecular charge transfer (ICT), solvationand charge injection processes that take place inthe picosecond time domain. However, anyenergetic relaxation of the excited statedecreases the injection kinetics.Steady-state spectroscopy and time-resolvedfluorescence measurements (from the femto- tothe nanosecond) were used to solve therelaxation dynamics of these dyes in solution, onmesoporous films and in complete cells.The spectral relaxation and fluorescencequenching dynamics of the excited state couldbe characterized independently and highlight anelectronic relaxation at the excited state. Thethree dyes studied evolve towards a chargetransfer state (CT state). Such a state is in stronginteraction with its environment.To study charge injection in semiconductormesoporous oxides, a time-resolvedfluorescence set-up for the study of opaque anddiffusive systems has been implemented and isdescribed in this thesis. It provides a timeresolution of about 300 fs.The results demonstrate the existence of acompetition between the injection of chargesand the relaxation of the excited state in thecomplete cells
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Schanz, Hans Roland [Verfasser]. "Femtosecond broadbandfluorescence upconversion / von Hans Roland Schanz". 2002. http://d-nb.info/964914964/34.

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Capítulos de libros sobre el tema "Femtosecond Upconversion"

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Toele, P., H. Wang, H. Zhang, M. Glasbeek, J. J. van Gorp y E. W. Meijer. "Femtosecond fluorescence upconversion studies of chiral self-assembled supramolecules in solution". En Femtochemistry and Femtobiology, 499–502. Elsevier, 2004. http://dx.doi.org/10.1016/b978-044451656-5/50097-9.

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Actas de conferencias sobre el tema "Femtosecond Upconversion"

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Petrov, V. y F. Noack. "Parametric Upconversion of Tunable Femtosecond Pulses". En Proceedings of European Meeting on Lasers and Electro-Optics. IEEE, 1996. http://dx.doi.org/10.1109/cleoe.1996.562279.

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Petrov, V. y F. Noack. "Parametric upconversion of tunable femtosecond pulses". En The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cwf24.

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Traveling-wave optical parametric generators pumped by Ti: sapphire regenerative amplifiers at 1 kHz repetition rate represent a convenient tool to produce powerful and highly reproducible femtosecond pulses in the near infrared. [1] Pumping by the second harmonic in order to cover the visible spectral region near 600 nm is, however, considerably complicated because of the substantial increase of the group-velocity mismatch. [2] We demonstrate here a rather simple way to avoid this problem by simultaneous phase-matching of two nonlinear optical processes, optical parametric amplification and sum-frequency generation in a single β-barium borate (BBO) nonlinear crystal.
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3

Dai, Ruihong, Haoyun Zhang, Shiyu Zhu y Fengqiu Wang. "An efficient wavelength upconversion effect in sapphire driven by microjoule femtosecond laser". En Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.ctha1e_03.

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We investigate the nonlinear wavelength conversion processes in sapphire under microjoule femtosecond laser pumping. With appropriate sapphire thickness and focal arrangement, a >10% wavelength upconversion effect was observed, showing potential use in multi-photon microscopy.
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4

Nakamura, R., Y. Inagaki, N. Umemura y T. Kamimura. "Polarization Sensitive Femtosecond Mid-Infrared Spectrometer Using Chirped-Pulse Upconversion". En Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleopr.2018.w3a.43.

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Lin, Hong y John Stephen Smith. "All-optical demultiplexing by frequency upconversion". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.mk5.

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We propose the use of frequency upconversion for time division demultiplexing. Suppose we receive an N-channel signal at frequency f1 and make a local short-pulse laser at frequency f2 have the same repetition rate as one of the channels. Mixing them properly in a nonlinear crystal, we can upconvert only one channel to frequency f3 = f1 + f2. We can demultiplex N channels by N such units. The frequency upconversion is a very fast (femtosecond domain or 10E5 GHz) and a low noise process. We show that nearly 80% conversion efficiency of 1.3-0.58 μm can be expected for 50-W peak power pumping at 1.06 μm in a 3-mm long barium sodium niobate crystal.1 The use of waveguide structure or high nonlinear organic materials may relax the pumping power requirement substantially.
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Moglia, F., S. Muller, T. Calmano, C. Krankel y G. Huber. "Er:LiLuF4 upconversion waveguide laser with femtosecond-laser written circular cladding structures". En 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC. IEEE, 2013. http://dx.doi.org/10.1109/cleoe-iqec.2013.6801381.

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Ashik, A. S., Callum F. O'Donnell, S. Chaitanya Kumar, M. Ebrahim-Zadeh, Peter Tidemand-Lichtenberg y Christian Pedersen. "Theoretical Modelling and Experimental Demonstration of a Mid-Infrared Femtosecond Upconversion System". En 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8873048.

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Hayat, Alex, Amir Nevet y Meir Orenstein. "Femtosecond g^(4)Measurement by HBT Interferometry of an Upconversion Based Autocorrelation". En Quantum Electronics and Laser Science Conference. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/qels.2010.qwg4.

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Ernsting, N. P. "Femtosecond Photodissociation of Aromatic Disulfides Followed by Solvent Relaxation". En International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.tub3.

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The dynamical properties of liquids may be probed in the time domain in two ways: either in the neat liquid by nonlinear scattering experiments, or else indirectly by studying the solvation dynamics of molecular probes [1,2]. In the latter case, optical excitation of a suitable dye molecule leads to a change in molecular dipole moment. As the surrounding solvent adjusts to a new equlibrium, solvent-solute interaction stabilizes the excited molecule, and this results in a red-shift of the fluorescence spectrum. Typical compounds for this purpose are coumarin or styryl dyes. However their use for ultrafast solvation dynamics is limited by a relatively large spectral width of fluorescence, or by the possibility of geometrical isomerisation. Furthermore, measurement requires fluorescence upconversion and spectral reconstruction which may be quite tedious.
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Huang, Wei, Chang Liu, Ying Qian, Feng Chu, Jin Xu, Changgui Lu y Yiping Cui. "Green frequency upconversion fluorescence of symmetrical 1,3,4-oxadiazole derivative by femtosecond three-photon excitation". En Photonics Asia 2007, editado por Yiping Cui, Qihuang Gong y Yuen-Ron Shen. SPIE, 2007. http://dx.doi.org/10.1117/12.757341.

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