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| Release | : 1980 |
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The influence of laser pulse propagation on multiple-photon excitation of many-level absorbers, and the significance of SIRF for SF6 dissociation are discussed.
| Author | : Stephen Troy Garner |
| Publisher | : |
| Total Pages | : 532 |
| Release | : 1991 |
| Genre | : Laser beams |
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| Release | : 1978 |
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Recent theoretical studies of coherent propagation effects in SF6 and other polyatomic molecules are summarized beginning with an account of relevant aspects of the high-resolution spectroscopy of the .nu.3 band of SF6. A laser pulse propagating in a molecular gas can acquire new frequencies which were not initially present in the pulse, and, in fact, a wave is coherently generated at the frequency of every molecular transition accessible from the initial molecular energy levels. The possible consequences of coherent generation of sidebands for the multiple-photon excitation of SF6 and other polyatomic molecules are discussed.
| Author | : Milan Prasad Poudel |
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| Total Pages | : |
| Release | : 2010 |
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Coherent control of laser induced processes is based on the quantum interference among multiple excitation pathways. Progress in the field has been fueled by advances in pulse shaping techniques, allowing modulation of phase and amplitude across the bandwidth of ultra short pulses. This dissertation makes use of coherent control technique for the optimization of two-photon fluorescence (TPF) and its applications in selective excitation for biomedical imaging. Different physical processes, e.g. TPF, second harmonic generation (SHG) and their ratios (e.g. TPF/SHG) were optimized by using feedback control pulse shaping technique with an evolutionary algorithm. Various nonlinear effects, e.g. filamentation, intensity clamping and white light generation were studied using two-photon fluorescence and Z-scan technique with different dyes and biomarkers. Simultaneous measurements of different nonlinear effects were performed. Novel methods were proposed and implemented to obtain two-photon excitation characteristics in intensity-resolved manner. Understanding of these nonlinear effects can give new solution to the issues of spatial resolution and molecular contrast for cellular and tissue imaging.
| Author | : Cyrus D. Cantrell |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 300 |
| Release | : 2013-03-08 |
| Genre | : Science |
| ISBN | : 3642822924 |
In the early 1970s, researchers in Canada, the Soviet Union and the United States discovered that powerful infrared laser pulses are capable of dissociating mole cules such as SiF4 and SF6' This result, which was so unexpected that for some time the phenomenon of multiple-photon dissociation was not recognized in many cir cumstances in which we now know that it occurs, was first publicized at a time when the possibility of using lasers for the separation of isotopes had attracted much attention in the scientific community. From the mid-1970s to the early 1980s, hun dreds of experimental papers were published describing the multiple-photon absorp tion of C02 laser pulses in nearly every simple molecule with an absorption band in the 9 - 11 jJm region. Despite this impressive volume of experimental results, and despite the efforts of numerous theorists, there is no agreement among re searchers in the field on many fundamental aspects of the absorption of infrared laser light by polyatomic molecules. This book is devoted to reviells of the experimental and theoretical research that provides the foundations for our current understanding of molecular multiple photon exc itat i on, and to rev i ews of research that is pert i nent to the 1 aser sep aration of isotopes.
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| Total Pages | : 1044 |
| Release | : 1990 |
| Genre | : Power resources |
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| Author | : K. L. Kompa |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 375 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 364267254X |
This conference on both the physics and chemistry of laser-induced processes in molecules was organized by the Quantum Electronics Divisional Board of the European Physical Society whose membership is given on p.367. The confer ence aim, to mix physicists and chemists interested in this exciting field both from Europe and further afield, was well fulfilled by the attendance of around 250 participants and the submission of about 100 papers, which dre presented here. Numerous people at both the Physics Department, Heriot-Watt University, Edinburgh, and at the Projektgruppe fUr Laserforschung, MPI, Garching, con tributed hard work to the organization; in addition to Dr. Bob Harrison, who bore the biggest burden with conspicuous success, we particularly thank Hugh MacKenzie, Richard Dennis and last but not least Miss Joanne Askham and the secretaries in Edinburgh together with Frau Doris Maischberger and the secretaries in Garching. December 1978 K.L. Kompa S.D. Smith Conren~ Part I. Study of Lasers and Related Techniques Suitable for Applications in Chemistry and Spectroscopy Rare Gas Halogen Lasers and Photochemical Applications. By S.D. Rockwood ... 3 Group VI Molecular Photolytic Dissociation Studies Using Rare Gas Halide Lasers. By M.C. Gower, A.J. Kearsley, and C.E. Webb ... 8 Broadly Tunable UV Source Based on Stimulated Raman Scattering.
| Author | : Joshua Jortner |
| Publisher | : John Wiley & Sons |
| Total Pages | : 786 |
| Release | : 2009-09-08 |
| Genre | : Science |
| ISBN | : 0470143134 |
The Advances in Chemical Physics series provides the chemical physics and physical chemistry fields with a forum for critical, authoritative evaluations of advances in every area of the discipline. Filled with cutting-edge research reported in a cohesive manner not found elsewhere in the literature, each volume of the Advances in Chemical Physics series serves as the perfect supplement to any advanced graduate class devoted to the study of chemical physics.
| Author | : Los Alamos National Laboratory |
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| Total Pages | : 348 |
| Release | : 1983 |
| Genre | : Research |
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| Author | : C. Bowden |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 393 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 1468424157 |
This volume contains the large majority of the papers presented at the Cooperative Effects Meeting which was held as part of the US Army Sponsored Symposium on New Laser Concepts at Redstone Arsenal, Alabama, from November 30 through December 2, 1976. The motivation for the meeting was to bring together a representative cross-section of research scientists active in related areas of cooperative effects in matter-radiation field interaction and coherent pulse generation and propagation. An emphasis was placed upon the rapidly developing areas of superradiance and superf1uorescence, with a balance between theory and experiment in regard to the choice of speakers. This meeting came at a very fortunate time when new experimental results in metal vapors and gases have just recently been realized. Also represented on the programwereareas dealing with new laser concepts such as the free electron laser and two photon amplifier. A few supplemental papers are included in this volume which were authored by participants at the meeting, but were not present on the agenda, primarily due to limited time. These were included because of their relation to the content of papers which were presented and/or were the subject of discussion among attendees. The meeting consisted of eleven invited papers and two work shop sessions, each with a panel. The order of the papers in this volume generally follows the order of their presentation on the agenda. However, the supplemental papers have been inserted where appropriate.
