Spontaneous and Induced Coherent Radiation Generation in Atomic Vapors PDF Download
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Author:
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Category :
Languages : en
Pages : 7
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Book Description
The time delayed four wave mixing technique using very wide band 300 angstroms laser noise has been applied to study nile blue and relaxation times in the low femtosecond regime have been measured as well as quantum beats which reveal vibronic structure. Relaxation in multi level systems has been analyzed and applied to the results in nile blue. Attosecond beats in K vapor have been observed and analyzed. Interference effects have been observed in Na vapor which allowed the erasing of photon echo information. Linear and nonlinear effects of local field corrections have been analyzed and applied to third harmonic generation and selective reflectivity. The local field corrections are found to effect both the line shape and the response frequency. When the input fields are intense an analysis which goes beyond the slowly varying amplitude approximation reveals that the transverse profile of the input beam is modified.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
The time delayed four wave mixing technique using very wide band 300 angstroms laser noise has been applied to study nile blue and relaxation times in the low femtosecond regime have been measured as well as quantum beats which reveal vibronic structure. Relaxation in multi level systems has been analyzed and applied to the results in nile blue. Attosecond beats in K vapor have been observed and analyzed. Interference effects have been observed in Na vapor which allowed the erasing of photon echo information. Linear and nonlinear effects of local field corrections have been analyzed and applied to third harmonic generation and selective reflectivity. The local field corrections are found to effect both the line shape and the response frequency. When the input fields are intense an analysis which goes beyond the slowly varying amplitude approximation reveals that the transverse profile of the input beam is modified.
Author: Sven R. Hartman
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Optical coherent techniques have been developed and applied in order to obtain relaxation and spectroscopic information in atomic vapors. Theoretical work was performed to understand collisional relaxation and the interaction of intense fields with matter. The utility of using incoherent light fields in generating coherent excitations was demonstrated and analyzed. Applications of the time delayed four wave mixing technique using broadband light for investigating relaxation in solids have begun. Keywords: Photon echo, Stimulated echo, Incoherent echo, Billiard ball model, Collisionally induced relaxation, Attosecond beats, Ultrafast modulation spectroscopy, Diffraction free beams, Time delay, Four wave mixing. (JHD).
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Category : Aeronautics
Languages : en
Pages : 316
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Category : Research
Languages : en
Pages : 1720
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 1516
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Author: Andreas F. Molisch
Publisher: Oxford University Press
ISBN: 9780198538660
Category : Science
Languages : en
Pages : 540
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Book Description
Radiation can be absorbed and re-emitted many times in atomic vapors before it reaches the boundaries of the container encasing the vapor. This effect is known as radiation trapping. It plays an important role practically everywhere atomic vapors occur, whether in spectroscopy, gas lasers, atomic line filters, the determination of atomic lifetimes, measurements of atomic interaction potentials, or electric discharge lamps. This book is the first to assemble all of the information necessary to handle practical problems related to radiation trapping, and it emphasizes both physical insights and mathematical methods. The introduction reviews resonance radiation and collision processes in atomic vapors. This is followed by detailed explanations of the physical effects and mathematical methods for various types of problems (e.g., with or without saturation, particle diffusion, reflecting cell walls). The last part of the book describes the applications of these methods to a variety of practical problems, such as cross-section measurements and the design of discharge lamps.
Author: Juntao Chang
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Category :
Languages : en
Pages :
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Cooperative effect in the radiation process has been studied in for more than half a century. It is important in the sense of both basic physics and applied science. In this work, we study the dynamics of the cooperative spontaneous emission from an ensemble of N atoms which is uniformly excited by absorbing a single photon. We reveal that there are two different regimes in which the system exhibits totally different behaviors. One of them is the superradiance type of behavior: the system decays much quicker than single atom decay, with a decay rate proportional to N(a/R)2, where N is the atom numbers, R is the size of the atom cloud, and a the wavelength. We call it Markovian regime because the sytem does not persist memory effect. The other regime is called non-Markovian regime and the system oscillates with effective Rabi oscillation frequency while slowly decaying with a rate proportional to the photon escaping rate. The effective Rabi oscillation is a new type of dynamics which analogs well known Cavity QED behavior. Particularly in the Markovian regime, we study the system dynamics as a manybody eigenfunction and eigenvalue problem. For a dense cloud, we find analytical solutions for the eigenstates and corresponding eigenvalues, which can help to generally describe the system dynamics for any initial conditions in this regime. One of the applications is in atom microscopy. We propose a scheme to measure the distance between two atoms/molecules beyond diffraction limit. It covers the whole range from half the wavelength to sub-nanometers, utilizing both the atom localization technique and the collective frequency shift effect due to the cooperative effect in the radiation of the two atoms. Another application that we propose is to generate Coherent XUV radiation using Raman-type superradaince. We prove that intense short pulses of XUV radiation can be produced by Raman type superradiance from an ensemble of atoms/ions driven by visible or IR laser pulses.
Author:
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ISBN:
Category : Optics
Languages : en
Pages : 540
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ISBN:
Category : Physics
Languages : en
Pages : 1420
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ISBN:
Category : Nuclear energy
Languages : en
Pages :
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