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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Pulsed laser excitation"

1

Chen, Defu, Ying Wang, Buhong Li, Huiyun Lin, Xuechun Lin, and Ying Gu. "Effects of pulse width and repetition rate of pulsed laser on kinetics and production of singlet oxygen luminescence." Journal of Innovative Optical Health Sciences 09, no. 06 (August 2016): 1650019. http://dx.doi.org/10.1142/s179354581650019x.

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Pulsed and continuous-wave (CW) lasers have been widely used as the light sources for photodynamic therapy (PDT) treatment. Singlet oxygen (1O2) is known to be a major cytotoxic agent in type-II PDT and can be directly detected by its near-infrared luminescence at 1270[Formula: see text]nm. As compared to CW laser excitation, the effects of pulse width and repetition rate of pulsed laser on the kinetics and production of 1O2 luminescence were quantitatively studied during photosensitization of Rose Bengal. Significant difference in kinetics of 1O2 luminescence was found under the excitation with various pulse widths of nanosecond, microsecond and CW irradiation with power of 20[Formula: see text]mW. The peak intensity and duration of 1O2 production varied with the pulse widths for pulsed laser excitation, while the 1O2 was generated continuously and its production reached a steady state with CW excitation. However, no significant difference ([Formula: see text]) in integral 1O2 production was observed. The results suggest that the PDT efficacy using pulsed laser may be identical to the CW laser with the same wavelength and the same average fluence rate below a threshold in solution.
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2

Fisher, Wait G., and Eric A. Wachter. "Improved Signal Processing in Multi-Photon Imaging." Microscopy and Microanalysis 6, S2 (August 2000): 800–801. http://dx.doi.org/10.1017/s1431927600036497.

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Multi-photon excitation has been used in microscopy for nearly a decade, providing a number of demonstrated advantages over other methods for fluorescence imaging. Because excitation is achieved using longer, less energetic light, photodamage and photobleaching of the sample are reduced. Furthermore, since excitation occurs only at the focal point, this approach allows the practical collection of three-dimensionally resolved fluorescence images of live cells. However, due to the small two-photon cross-section of most fluorophores, pulsed lasers are required to generate detectable signal levels. This is due to the quadratic dependence of twophoton absorption on the instantaneous power of the laser. Typically, these lasers are pulsed at very high repetition frequencies, on the order of 106 pulses per second with pulse durations of a few hundreds of femtoseconds. For example, a titanium:sapphire (Ti:S) laser mode-locked at 76 Mhz can provide up to 100,000 watts of instantaneous power and is ideal for exciting two-photon events.
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3

Razhev, Aleksandr, Dmitriy Churkin, and Alexey Zavyalov. "Pulsed Inductive Molecular Hydrogen Laser." Siberian Journal of Physics 4, no. 3 (October 1, 2009): 12–19. http://dx.doi.org/10.54362/1818-7919-2009-4-3-12-19.

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A pulsed inductive discharge molecular H2 laser has been created for the first time. The excitation system of a toroidal pulsed inductive discharge for molecular hydrogen electron levels excitation was developed. Generation at two wavelengths of 0,89 and 1,12 m was obtained. The spectral, temporal and energy parameters of laser emission under various pressures and pumping conditions were investigated. The maximum pulse power of 6,7 kW was achieved. The measured pulse duration was 18 ± 1 ns. In the cross-section, the laser radiation had the ring shape with an external diameter of 33 mm and thickness of 4 mm.
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4

Georges, Joseph. "Continuous-Wave-Laser versus Pulsed-Laser Excitation for Crossed-Beam Photothermal Detection in Small Volume Applications: Comparative Features." Applied Spectroscopy 59, no. 9 (September 2005): 1103–8. http://dx.doi.org/10.1366/0003702055012645.

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Crossed-beam thermal lens spectrometry can be implemented using continuous-wave- (cw) laser or pulsed-laser excitation. In both cases, the signal depends on the position of the sample with respect to the probe beam waist, the size of the excitation beam, the beam-size ratio into the sample, and the power or energy of the excitation beam. However, due to differences in the rate of formation and relaxation of the thermal lens, both methods exhibit distinct key features. Optimization of the experimental setup and understanding the thermal lens signal are more complicated under cw-laser excitation than with pulsed-laser excitation. Unlike that observed under pulsed excitation, the effect of the excitation beam waist, of the sample size, and of the flow rate are closely related to the effective size of the thermal element and depend on the chopping frequency. Although the intrinsic sensitivities are almost the same, the performance can significantly differ depending on the chopping frequency or pulse repetition rate, which should be high enough to allow fast data collection and efficient signal averaging.
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5

Fotiou, Fotios K., and Michael D. Morris. "Photothermal Deflection Densitometer with Pulsed-UV Laser Excitation." Applied Spectroscopy 40, no. 5 (July 1986): 700–704. http://dx.doi.org/10.1366/0003702864508610.

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First application of pulsed photothermal deflection spectroscopy to solid samples is demonstrated. A new densitometer for thin layer chromatography based on this method is described. The technique is suitable for direct measurements in the ultraviolet region. A pulsed excimer laser is used to produce a transient thermal refractive index gradient. The laser delivers pulses of 1–2 mJ at 10–22 pulses/s, at 351 nm. With this system the detection limit for 2,4-dinitroaniline is 750 pg. The signal is linear with amount of analyte for about three orders of magnitude.
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6

Kozlovsky, Vladimir, Marat Butaev, Yury Korostelin, Stanislav Leonov, Yan Skasyrsky, and Mikhail Frolov. "Study of Fe:ZnSe Laser Exited by Diode Side-Pumped Er:YAG Laser." Photonics 10, no. 8 (July 26, 2023): 869. http://dx.doi.org/10.3390/photonics10080869.

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The performance of a Fe:ZnSe laser was investigated in different schemes of excitation by a pulsed diode side-pumped Er:YAG laser. At the temperature of liquid nitrogen, the Fe:ZnSe laser, pumped by a free running 360-μs Er:YAG laser and demonstrated a pulse energy of 53 mJ with a slope efficiency of 42% relative to absorbed pump energy. When operating at room temperature, two optical schemes were considered. In the first one, the Fe:ZnSe laser crystal was pumped by a Q-switched Er:YAG laser with a passive shutter based on an additional Fe:ZnSe crystalline plate, and the cavities of both lasers were independent. In the second scheme, the cavities of the Fe:ZnSe and Er:YAG lasers were coupled, and the Fe:ZnSe crystal simultaneously served as an active element of the Fe:ZnSe laser and a passive shutter of the Er:YAG laser. Pulses with a duration of less than 200 ns and an energy of ~1 mJ were obtained from the Fe:ZnSe laser with a repetition rate of up to 50 kHz. The experimental waveforms of the laser pulses were approximated by rate equations.
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7

WANG, Z. P., C. M. GU, and W. Z. SHEN. "PHOTOINDUCED LASER EFFECTS IN INDIUM NITRIDE FILM." Modern Physics Letters B 25, no. 03 (January 30, 2011): 185–92. http://dx.doi.org/10.1142/s021798491102550x.

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The optical nonlinear absorption properties in sputtering Indium nitride ( InN ) film were investigated under the excitations of nanosecond, picosecond and femtosecond pulsed lasers by open-aperture transmission Z-scan technique (TZ-scan). Under the condition of hν > Eg, the saturable absorption (SA) phenomena induced by one-photon transition were observed in both nanosecond and picosencond pulsed TZ-scan measurements. When 2hν > Eg > hν, the film presented SA due to the two-photon transition under the excitation of picosecond laser. However, at femtosecond 800 nm, the film showed the two-photon absorption (TPA) instead of SA, and the TPA coefficient tended to a saturable value as the excitation intensity increased. The results indicate that the InN film is a kind of good saturable absorber.
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8

Sakamoto, Akira, Yukio Furukawa, Mitsuo Tasumi, and Koji Masutani. "Asynchronous Pulsed-Laser-Excited Fourier Transform Raman Spectroscopy and its Applications." Applied Spectroscopy 47, no. 9 (September 1993): 1457–61. http://dx.doi.org/10.1366/0003702934067504.

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An asynchronous pulsed-laser-excited Fourier transform Raman spectrophotometer based on a conventional continuous-scan interferometer has been developed. The additional assembly required for pulsed-laser-excited measurements, which consists of a pulsed Nd:YAG laser, a gate circuit, and a low-pass filter, can be attached to any conventional FT-Raman spectrophotometer. The principle of the signal-processing of this method is almost the same as that of the asynchronous time-resolved Fourier transform infrared spectroscopy reported previously. This method does not require the synchronization between the Raman excitation and the sampling of the A/D converter. As an application of this method, it is demonstrated that the use of a pulsed laser and a gate circuit can give a significant increase in signal-to-noise ratios over continuous-wave measurements with the same average laser power. It is also shown that when a constant background (for example, thermal radiation from samples at high temperatures) or a long-lived background is present, the use of pulsed excitation and a gate circuit can effectively reduce the background. Moreover, pulsed excitation can be used for recording time-resolved Raman spectra by using an FT-Raman spectrophotometer. The time resolution is governed only by the width of the probe laser pulse. The potentiality of this method is demonstrated.
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9

Kaselouris, E., I. K. Nikolos, Y. Orphanos, E. Bakarezos, N. A. Papadogiannis, M. Tatarakis, and V. Dimitriou. "A Review of Simulation Methods of Laser Matter Interactions Focused on Nanosecond Laser Pulsed Systems." Journal of Multiscale Modelling 05, no. 04 (December 2013): 1330001. http://dx.doi.org/10.1142/s1756973713300013.

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A review study of the developments in the field of pulsed laser-solid interaction simulation methods, for moderate laser energies, is presented. The paper is focused on the methods that numerically simulate the interactions of pulsed ns-laser with solid metal targets. Three main regimes for pulsed laser excitation, are well established, namely, the thermoelastic, melting and plasma regimes. The modelling and simulation techniques that may numerically describe these three regimes and the occurring dynamic matter responses are reviewed. Modelling efforts concerning various fields of applications of lasers are briefly discussed.
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10

Tereszchuk, K. A., J. M. Vadillo, and J. J. Laserna. "Glow-Discharge-Assisted Laser-Induced Breakdown Spectroscopy: Increased Sensitivity in Solid Analysis." Applied Spectroscopy 62, no. 11 (November 2008): 1262–67. http://dx.doi.org/10.1366/000370208786401491.

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A glow discharge operating in steady-state and pulsed temporal conditions is used to excite the material previously excited by a pulsed laser ablation system. The system provides a simple means by which to potentially excite the material ablated by the incident laser pulse by taking advantage of enhanced collisional excitation. In this way, one can effectively reduce laser pulse energies below the excitation and ionization thresholds to potentially those required solely for laser ablation of the material, reducing sample damage and improving the lateral resolution. Several critical parameters such as the gas pressure, gas type, and discharge voltage were evaluated, demonstrating the potential of the technique for spatially resolved analysis. The new dual glow-discharge laser-induced breakdown spectroscopy (GD-LIBS) synchronous scheme provides significant signal enhancements when compared to LIBS or GD under identical conditions.
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Дисертації з теми "Pulsed laser excitation"

1

Little, Helen. "Optical micromanipulation using ultrashort pulsed laser sources." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/338.

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2

Mauguet, Maxime. "Etude de la génération d'événements singuliers par excitation laser impulsionnel dans des composants silicium utilisés en environnement radiatif." Thesis, Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0012/document.

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Les composants électroniques utilisés pour des applications spatiales sont soumis à des rayonnements susceptibles de les rendre inopérants. Pour se prémunir de tels effets, leur sensibilité est testée au sol dans des accélérateurs de particules, onéreux et complexes à mettre en œuvre. Ce travail de thèse porte sur l’utilisation d’impulsions laser pour reproduire sous certaines conditions les effets des ions lourds. Le déclenchement de phénomènes parfois destructifs sur plusieurs types de composants de niveaux d’intégration différents a été obtenu sur le banc laser développé pendant cette thèse. Cela ouvre la voix à l’utilisation du laser comme outil de diagnostic en tirant partie de ses avantages en termes d’accessibilité, de coûts et de compréhension fine des effets
Electronic components used for space applications may exhibit failures under radiation. To prevent uch effects, the radiation sensitivity is evaluated using particle accelerators. Since those facilities are nly few around the world and expensive, complementary tests are needed to analyse radiation ensitivity. This work contributes to the use of laser pulses to reproduce under given conditions the ffects of heavy ions. Using the laser set-up developed during this thesis, single events which may be estructive were triggered on several types of electronic components. This paves the way to the use of aser as a diagnostic tool, given its advantages in terms of accessibility, costs and detailed analysis
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3

Xu, Bingwei. "Control of multiphoton molecular excitation with shaped femtosecond laser pulses." Diss., Connect to online resource - MSU authorized users, 2008.

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4

Papastathopoulos, Evangelos. "Adaptive control of electronic excitation utilizing ultrafast laser pulses." Doctoral thesis, [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975015184.

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5

Modoran, Georgia C. "Intense field electron excitation in transparent materials." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133273960.

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6

Wang, Xiong, Russell S. Witte, and Hao Xin. "Thermoacoustic and photoacoustic characterizations of few-layer graphene by pulsed excitations." AMER INST PHYSICS, 2016. http://hdl.handle.net/10150/615111.

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We characterized the thermoacoustic and photoacoustic properties of large-area, few-layer graphene by pulsed microwave and optical excitations. Due to its high electric conductivity and low heat capacity per unit area, graphene lends itself to excellent microwave and optical energy absorption and acoustic signal emanation due to the thermoacoustic effect. When exposed to pulsed microwave or optical radiation, distinct thermoacoustic and photoacoustic signals generated by the few-layer graphene are obtained due to microwave and laser absorption of the graphene, respectively. Clear thermoacoustic and photoacoustic images of large-area graphene sample are achieved. A numerical model is developed and the simulated results are in good accordance with the measured ones. This characterization work may find applications in ultrasound generator and detectors for microwave and optical radiation. It may also become an alternative characterization approach for graphene and other types of two-dimensional materials. (C) 2016 AIP Publishing LLC.
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7

Lin, Jiunn-Yuan. "Optimisation of multi-pulse pumping for collisional excitation X-ray lasers." Thesis, University of Essex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265028.

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8

Raymond, Xavier. "Développement d'une source pulsée d'électrons extraits d'un plasma produit par laser." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0142/document.

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Ce manuscrit de thèse décrit le développement d'un faisceau d'électrons intense et bref qui s'insère dans le cadre de la recherche sur les propriétés nucléaires de la matière au sein des plasmas chauds et denses. Afin d'obtenir un tel faisceau, une nouvelle source a été imaginée, dont le principe est basé sur l'extraction des électrons d'un plasma produit par une impulsion laser intense. La caractérisation du plasma produit par laser lors de son expansion fait l'objet d'une première partie expérimentale de ce manuscrit. Ensuite, une différence de potentiel électrique de l'ordre de quelques kV appliquée sur le plasma lors de son expansion montre que l'extraction des électrons est un processus dynamique. Ces observations expérimentales sont validées par des études numériques à l'aide du code de simulation Particle-In-Cell "XOOPIC". Enfin, les distributions en surface et en énergie des électrons extraits du plasma sont déterminées expérimentalement et numériquement tout au long de l'expansion du plasma, ce qui fait l'objet d'une ultime partie de ce manuscrit. Pour cela, un détecteur de type Faraday Cup est utilisé. Une analyse de l'intensité d'émission du courant d'électrons via un modèle numérique met en évidence la présence d'un pré-plasma fournissant un champ électrique extracteur supplémentaire
This Ph.D thesis describes the development of an intense and brief electron beam and forms part of the research on the nuclear properties of matter in hot and dense plasmas. In order to obtain such a beam, a new source has been created, the principle is based on the extraction of electrons from a plasma produced by an intense laser pulse. The characterization of the laser-produced plasma during its expansion is the subject of a first experimental part of this thesis. Then, an electrical potential of the order of a few kV applied to the plasma during its expansion shows that the extraction of the electrons is a dynamic process. These experimental observations are validated by numerical studies using Particle-In-Cell simulation code "XOOPIC". Finally, the surface and energy distributions of the electrons extracted from the plasma are determined experimentally and numerically throughout the plasma expansion, which is the final part of this thesis. For this, a Faraday Cup type detector is used. An analysis of the emission intensity of the electron current with a numerical model shows the presence of a pre-plasma providing an additional extracting electric field
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Vanne, Yulian V. "Ionization of molecular hydrogen in ultrashort intense laser pulses." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16107.

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Ein neuer numerischer ab initio Ansatz wurde entwickelt und zur Lösung der zeitabhängigen Schrödingergleichung für zweiatomig Moleküle mit zwei Elektronen (z.B. molekularer Wasserstoff), welche einem intensiven kurzen Laserpuls ausgesetzt sind, angewandt. Die Methode basiert auf der Näherung fester Kernabstände und der nicht-relativistischen Dipolnäherung und beabsichtigt die genaue Beschreibung der beiden korrelierten Elektronen in voller Dimensionalität. Die Methode ist anwendbar für eine große Bandbreite von Laserpulsparamtern und ist in der Lage, Einfachionisationsprozesse sowohl mit wenigen als auch mit vielen Photonen zu beschreiben, sogar im nicht-störungstheoretischen Bereich. Ein entscheidender Vorteil der Methode ist ihre Fähigkeit, die Reaktion von Molekülen mit beliebiger Orientierung der molekularen Achse im Bezug auf das linear polarisierte Laserfeld in starken Feldern zu beschreiben. Dementsprechend berichtet diese Arbeit von der ersten erfolgreichen orientierungsabhängigen Analyse der Multiphotonenionisation von H2, welche mit Hilfe einer numerischen Behandlung in voller Dimensionalität durchgeführt wurde. Neben der Erforschung des Bereichs weniger Photonen wurde eine ausführliche numerische Untersuchung der Ionisation durch ultrakurze frequenzverdoppelte Titan:Saphir-Laserpulse (400 nm) präsentiert. Mit Hilfe einer Serie von Rechnungen für verschiedene Kernabstände wurden die totalen Ionisationsausbeuten für H2 und D2 in ihren Vibrationsgrundzuständen sowohl für parallele als auch für senkrechte Ausrichtung erhalten. Eine weitere Serie von Rechnungen für 800nm Laserpulse wurde benutzt, um ein weitverbreitetes einfaches Interferenzmodel zu falsifizieren. Neben der Diskussion der numerischen ab initio Methode werden in dieser Arbeit verschiedene Aspekte im Bezug auf die Anwendung der Starkfeldnäherung für die Erforschung der Reaktion eines atomaren oder molekularen Systems auf ein intensives Laserfeld betrachtet.
A novel ab initio numerical approach is developed and applied that solves the time-dependent Schrödinger equation describing two-electron diatomic molecules (e.g. molecular hydrogen) exposed to an intense ultrashort laser pulse. The method is based on the fixed-nuclei and the non-relativistic dipole approximations and aims to accurately describe both correlated electrons in full dimensionality. The method is applicable for a wide range of the laser pulse parameters and is able to describe both few-photon and many-photon single ionization processes, also in a non-perturbative regime. A key advantage of the method is its ability to treat the strong-field response of the molecules with arbitrary orientation of the molecular axis with respect to the linear-polarized laser field. Thus, this work reports on the first successful orientation-dependent analysis of the multiphoton ionization of H2 performed by means of a full-dimensional numerical treatment. Besides the investigation of few-photon regime, an extensive numerical study of the ionization by ultrashort frequency-doubled Ti:sapphire laser pulses (400 nm) is presented. Performing a series of calculations for different internuclear separations, the total ionization yields of H2 and D2 in their ground vibrational states are obtained for both parallel and perpendicular orientations. A series of calculations for 800nm laser pulses are used to test a popular simple interference model. Besides the discussion of the ab initio numerical method, this work considers different aspects related to the application of the strong-field approximation (SFA) for investigation of a strong-field response of an atomic and molecular system. Thus, a deep analysis of the gauge problem of SFA is performed and the quasistatic limit of the velocity-gauge SFA ionization rates is derived. The applications of the length gauge SFA are examined and a recently proposed generalized Keldysh theory is criticized.
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10

De, Clercq Ludwig Erasmus. "Numerical modelling of the excitation of polyatomic molecules by femtosecond laser beams." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6522.

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Thesis (MSc)--University of Stellenbosch, 2011.
ENGLISH ABSTRACT: The selective excitation of an arbitrary vibrational level of a polyatomic molecule, without passage through an intermediary electronic excited state is demonstrated. This was achieved by simulating the interaction of a shaped, femtosecond pulse with one vibrational mode of the molecule. The carrier frequency of the pulse is chosen near resonant to the ground-to- rst-excited vibrational transition of the mode, and the pulse shape is optimized via closed-loop feedback. The simulation concentrates on the rst few vibrationally excited states since the density of states is still low, thus ensuring that the inter-vibrational decoherence time is relatively long compared to the pulse length. While various molecules were investigated this study focuses onUF6 for which detailed spectroscopic data for the v3 vibrational mode is available in literature. A multilevel model was developed and can be adapted for any number of levels. The model reported here was limited to a vibrational quantum number of four. The spectroscopic data included anharmonic splitting as well as forbidden transitions. The effect of rotational levels was not included. A density matrix approach was followed because this will allow for the introduction of dephasing of the coherent excitation via thermalizing collisions with the reservoir, as well as inter-vibrational relaxation. The time evolution of the density matrix is given by the Von Neumann equations.
AFRIKAANSE OPSOMMING: Die selektiewe opwekking van 'n arbitrêre vibrasionele vlak van 'n poliatomies molekule sonder oorgang na 'n intermediëre elektroniese opgewekte toetstand word gedemonstreer. Dit was bereik deur die interaksie te simuleer van 'n gevormde, femtosekonde pulse met een vibrasionele mode van 'n molekule. Die draer frekwensie van die pulse is so gekies dat dit naby resonansie van die grond-tot-eerste-opgewekte vibrasionele oorgang van die mode is, die puls vorm word geoptimeer deur 'n geslote-lus terugvoer. Die simulasie konsentreer op die eerste paar vibrasionele opgewekte toestande, omdat die digtheid van toestande nog steeds laag is, dus verseker dit dat inter-vibrasionele de-koherensie tyd relatief lank is in vergelyking met die puls se lengte. Verskillende molekules was ondersoek vir die studie. Die fokus is op UF6 waarvoor gedetaileerde spektroskopiese data vir die v3 vibrasionele beskikbaar is in die literatuur. 'n Multivlak model was ontwikkel en kan aangepas word vir enige aantal van vlakke. Die model wat hier aangemeld is, is beperk tot die vibrasionele kwantum getal van vier. Die spektroskopiese data het anharmonies splitting so wel as nie toegelaatbare oorgange bevat. Die effek van rotasionele vlakke was nie in berekening geneem nie. 'n Digtheids matriks benadering was gevolg, omdat dit toelaat vir die dekoherensie. Die tyd evolusie van die digtheids matriks word gegee deur die Von Neumann vergelykings.
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Книги з теми "Pulsed laser excitation"

1

Manipulating quantum structures using laser pulses. Cambridge, UK: Cambridge University Press, 2011.

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2

E, Bron Walter, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Study Institute on Ultrashort Processes in Condensed Matter (1992 : Il Ciocco, Italy), eds. Ultrashort processes in condensed matter. New York: Plenum Press, 1993.

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3

Shore, Bruce W. Manipulating Quantum Structures Using Laser Pulses. Cambridge University Press, 2011.

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4

Shore, Bruce W. Manipulating Quantum Structures Using Laser Pulses. Cambridge University Press, 2011.

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5

Shore, Bruce W. Manipulating Quantum Structures Using Laser Pulses. Cambridge University Press, 2011.

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6

Shore, Bruce W. Manipulating Quantum Structures Using Laser Pulses. Cambridge University Press, 2011.

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7

Cina, Jeffrey A. Getting Started on Time-Resolved Molecular Spectroscopy. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780199590315.001.0001.

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This textbook details the basic theory of ultrafast molecular spectroscopy starting from time-dependent quantum mechanical perturbation theory in Hilbert space. The emphasis is on the dynamics of nuclear and electronic motion initiated and monitored by femtosecond laser pulses that underlies nonlinear optical signal formation and interpretation. Topics include short-pulse optical absorption, the molecular adiabatic approximation, transient-absorption spectroscopy, vibrational adiabaticity during conformational change, femtosecond stimulated Raman spectroscopy, multi-dimensional electronic spectroscopy and wave-packet interferometry, and two-dimensional wave-packet interferometry of electronic excitation-transfer systems. Numerous exercises embedded in the text explore and expand upon the physical concepts encountered in this important research field.
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8

Bron, Walter E. Ultrashort Processes in Condensed Matter. Springer, 2012.

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Частини книг з теми "Pulsed laser excitation"

1

Miyasaka, Hiroshi, Syoji Ito, and Yukihide Ishibashi. "Multiphoton-Gated Photochromic Reactions Induced by Pulsed Laser Excitation." In Photon-Working Switches, 225–35. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56544-4_11.

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2

Vasil’ev, P. P., D. Grosenick, E. Klose, A. V. Konyashchenko, A. B. Sergeev, and M. Lenzner. "Pulsed Excitation of a GaAlAs Semiconductor Laser by Picosecond Optoelectronic Switches." In Springer Proceedings in Physics, 117–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75826-3_22.

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3

Vuchkov, Nikolai K. "Novel Circuits for the Excitation of Metal Vapour Lasers." In Pulsed Metal Vapour Lasers, 183–88. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1669-2_18.

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4

Warren, Warren S., and Mark Haner. "Laser Pulse Shaping for State-Selective Excitation." In Atomic and Molecular Processes with Short Intense Laser Pulses, 1–9. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0967-3_1.

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5

Hess, P. "Laser Excitation and Detection of Surface Acoustic Wave Pulses." In Excimer Lasers, 121–31. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-8104-2_9.

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6

Sage, Martin L. "Multiphoton Excitation of Bond Modes." In Atomic and Molecular Processes with Short Intense Laser Pulses, 447–51. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0967-3_53.

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7

Kulander, K. C., K. J. Schafer, and J. L. Krause. "Dynamics of Short-Pulse Excitation, Ionization and Harmonic Conversion." In Super-Intense Laser-Atom Physics, 95–110. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-7963-2_10.

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8

Mazur, Eric. "Interaction of Ultrashort Laser Pulses with Solids." In Spectroscopy and Dynamics of Collective Excitations in Solids, 417–70. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5835-4_14.

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9

Nayfeh, Munir H., J. Mazumder, David Humm, Thomas Sherlock, and Kwan Ng. "Multiphoton Multielectron Excitation and Ionization of H2." In Atomic and Molecular Processes with Short Intense Laser Pulses, 177–86. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0967-3_22.

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10

Weiner, A. M., D. E. Leaird, G. P. Wiederrecht, and K. A. Nelson. "Femtosecond Pulse Shaping and Excitation of Molecular Coherences." In Coherence Phenomena in Atoms and Molecules in Laser Fields, 277–89. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3364-1_26.

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Тези доповідей конференцій з теми "Pulsed laser excitation"

1

Bhadani, P. K., Y. X. Tang, and R. G. Harrison. "Multijoule TE CO2 laser using a novel magnetic-spiker sustainer excitation circuit." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cml5.

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Recently we investigated several innovative approaches for electrical excitation of a TEA CO2 laser1-5 in order to overcome the limitations of existing discharge and switching technology and to provide an overall improvement in the laser performance. In particular, the magneticspiker sustainer excitation circuit has proved to be a power approach for efficient excitation of large volume pulsed CO2 lasers. This has provided high efficiency (15%) variable flat top long duration laser pulses (1–5µs), helium-free operation, and elimination of plasma switch (thyratron/spark gap) from the main discharge path, leading to the development of laser systems with a long operational lifetime and high reliability.
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2

Lim, Ki-Soo, Yoo-Mi Oh, Soo-Cheon Lee, and Arao Nakamura. "Upconversion in Tm:LaF3 under pulsed excitation." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwf32.

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Upconversion emission at 480 nm in Tm:LaF3 crystals was reported with continuous excitation in the red[l] and the excitation at 635.2 nm produced photon avalanche upconversion emission. However, the upconversion emission has not been investigated in this crystal for pulse laser excitation. In this paper, we report the separation of two kinds of two-step upconversion processes for the blue upconversion emission in the crystal. One process is a single pulse sequential two-step absorption process of the 3H6 → 3F2 and 3H4 → 1D2 transitions and the other two-step absorption process is produced by the successive pulse excitations from 3H6 to 3F2 and from 3F4 to 1G4. Pulse repetition rate dependence of the emission at 480 nm with an excimer-laser pumped dye laser excitation in Fig.1 shows the separation of two upconversion processes. The emission at 656 nm excitation even with 1 Hz indicates the single pulse two-step upconversion, although it increases due to the accumulation of the population in the 3H4 level when the repetition rate does.
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3

Lingk, C., G. von Plessen, J. Feldmann, M. Arzberger, G. Bohm, M. C. Amann, and G. Abstreiter. "Quantum dot laser dynamics after pulsed optical excitation." In CLEO 2001. Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest. IEEE, 2001. http://dx.doi.org/10.1109/cleo.2001.947908.

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4

Gerasimov, V. A. "Metal vapor lasers with indirect excitation of upper laser levels via intermediate states." In International Conference on Atomic and Molecular Pulsed Lasers, edited by Victor F. Tarasenko, Georgy V. Mayer, and Gueorgii G. Petrash. SPIE, 1998. http://dx.doi.org/10.1117/12.311935.

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5

Kuznetsova, Rimma T., Tat'yana N. Kopylova, K. M. Degtjarenko, Evgenii N. Tel'minov, Lyibov G. Samsonova, A. K. Sergeev, and S. N. Nesterenko. "Effect of excitation conditions on photostability of 2-(4pyridyl)-5 phenyl)oxazole laser media." In Second Conference on Pulsed Lasers: Pulsed Atomic and Molecular Transitions, edited by Victor F. Tarasenko, Georgy V. Mayer, and Gueorgii G. Petrash. SPIE, 1995. http://dx.doi.org/10.1117/12.216900.

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6

Gekat, Frank, and Hans H. Klingenberg. "Pulsed microwave excitation of rare-gas halide mixtures." In Optics, Electro-Optics, and Laser Applications in Science and Engineering, edited by G. Glen McDuff. SPIE, 1991. http://dx.doi.org/10.1117/12.43617.

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7

Yasuoka, Koichi, Akira Ishii, Tohru Tamagawa, and Iwao Ohshima. "Newly developed excitation circuit for kHz pulsed lasers." In Optics, Electro-Optics, and Laser Applications in Science and Engineering, edited by Jin J. Kim and Frank K. Tittel. SPIE, 1991. http://dx.doi.org/10.1117/12.43633.

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8

Vuchkov, N. K., D. N. Astadjov, and N. V. Sabotinov. "Pulsed discharge excitation processes in the CuBr vapor laser." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cwb2.

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In our previous papers1,2 we have suggested two novel excitation circuits for CuBr vapor laser (IPC and IC circuits). The effect of these new circuits is an essential increase of the laser efficiency.
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9

Kapitan, D., D. W. Coutts, and C. E. Webb. "High-Gain Double-Pass Pulsed Dye Amplifiers For Laser Guide Stars." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cthi63.

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Laser guide stars (LGS) are required to obtain complete sky coverage for astronomical telescopes incorporating adaptive optics. Resonant scattering of a high power pulsed laser from atomic sodium in the mesosphere is the most promising technique for the production of a LGS. However, due to saturation of the sodium layer, the efficient generation of a bright LGS using pulsed excitation is difficult. We are devising a modular system where the brightness of the LGS can be increased linearly by adding more laser units [1]. A frequency-locked cw dye laser acts as a master oscillator (MO) which is alternately pulsed amplified through an array of dye amplifiers by means of time-multiplexing thus creating a pulse-train. Consequently, the peak power of each pulse does not increase when the average power is scaled to give a larger photon return from the LGS.
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10

Harms, Todd M., and Xianfan Xu. "Photon Counting Temperature Measurements During Pulsed Laser Heating of Al2O3-TiC Ceramics." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1076.

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Abstract This work investigates photon-counting measurements during pulsed laser heating of an Al2O3-TiC substrate. The excitation source is a Nd:YAG laser operating at a fundamental wavelength of 1064 nm. The laser fluence is varied in the range from 0.272 J/cm2 to 0.839 J/cm2. The emission spectra, captured by single photon counting, are related to temperature by Planck’s distribution. The suitability of this method is discussed. Pulse exposure, the number of pulses that a given surface location receives, is found to be a vitally important parameter. Numerical simulations of transient heat conduction support the results of high pulse exposure measurements. Low pulse exposure experiments exhibit higher temperatures due to chemical reactions at the surface and grain boundary effects.
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Звіти організацій з теми "Pulsed laser excitation"

1

Boller, P., A. Zylstra, J. Burggraf, G. Henry, L. Bernstein, C. Brabetz, J. Glorius, et al. Nuclear Excitation and Fission Studies with Short Pulsed Laser-Driven High Energy Gamma Rays. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1825853.

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2

Stultz, Carl. Liquid transmission line pulser circuit for laser excitation. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.5234.

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