Temperature effect on dye laser spectra and optical properties of organic dyes.
Item
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Title
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Temperature effect on dye laser spectra and optical properties of organic dyes.
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Identifier
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AAI9020788
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identifier
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9020788
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Creator
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Moghaddasi, Jalil.
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Contributor
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Adviser: S. Ahmed
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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The thesis describes the effects of temperature on dye laser spectra and optical properties of organic dyes. The study involved an investigation of the changes in absorption and fluorescence spectra of laser dyes on the efficiency of lasing and threshold power of cw dye lasers as the temperature of the dye solutions varied. An important role is established for the variation of concentration ratios with temperature of different types of dye in solution in shaping the threshold power and lasing efficiency of dye-based active liquids. The study of the possibility of increasing the lasing estability of active media is also especially important. In this connection, in the present work a number of experiments were carried out to study the spectra-luminescence and lasing characteristics of number of Rhodamine dyes in different solvents, different concentration at different temperature. We examine the mechanism of the influence of intermolecular relaxation on the characteristic of the induced emission of the solutions. A theoretical basis is also established for a hypothesis on the active role of the solvent as a factor that facilitates the conditions for the development of the lasing of the solutions. These factors have potential impact in improving dye laser characteristics and will result in substantial differences in attainable operating performance of at least some dye lasers. The study of temperature effects will be extended for examination of optical properties of organic dyes. An analytical expression for the real part of the complex refractive index is obtained in terms of the absorption coefficient. This result is then combined with the general reflectance expression to predict the reflectance of an absorbing medium at any given wavelength, solely in terms of the absorption coefficient of the medium at that wavelength and the angle of incidence. Experiments were also carried out for measurements of reflection intensity at low temperature. Four areas are investigated: (1) Temperature effects on absorption and Fluorescence spectra of dye solutions, (2) Temperature effects on lasing efficiency and threshold power of dye solutions, (3) Comprehensive examination of temperature effects on the lasing characteristics of Rhodamine cw dye lasers, (4) Temperature effects on optical reflective properties of Rhodamine dyes.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
