908 resultados para Cascaded Transformer, DSTATCOM, Multilevel, Resonant Controller


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Imprint varies: Reports for 1878-1879 printed by A.L. Bancroft & Company, San Francisco

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Latest issue consulted: 9th (1920).

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"A cooperative project between Office of Production Research and Development, Consumer Products Branch, War Production Board; the Utah Scientific Research Foundation; and the Utah State Engineering Experiment Station of the Utah State Agricultural College."-Intro.

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Concert Program

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We study the absorption and dispersion properties of a weak probe field monitoring a two-level atom driven by a trichromatic field. We calculate the steady-state linear susceptibility and find that the system can produce a number of multilevel coherence effects predicted for atoms composed of three and more energy levels. Although the atom has only one transition channel, the multilevel effects are possible because there are multichannel transitions between dressed states induced by the driving field. In particular, we show that the system can exhibit multiple electromagnetically induced transparency and can also produce a strong amplification at the central frequency which is not attributed to population inversion in both the atomic bare states and in the dressed atomic states. Moreover, we show that the absorption and dispersion of the probe field is sensitive to the initial relative phase of the components of the driving field. In addition, we show that the group velocity of the probe field can be controlled by changing the initial relative phases or frequencies of the driving fields and can also be varied from subluminal to superluminal. (C) 2003 Elsevier Science B.V. All rights reserved.