Browsing by Subject "photons"
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Item Asymmetry-driven structure formation in pair plasmas(2009-12) Mahajan, S. M.; Shatashvili, N. L.; Berezhiani, V. I.; Mahajan, S. M.The nonlinear propagation of electromagnetic waves in pair plasmas, in which the electrostatic potential plays a very important but subdominant role of a "binding glue" is investigated. Several mechanisms for structure formation are investigated, in particular, the "asymmetry" in the initial temperatures of the constituent species. It is shown that the temperature asymmetry leads to a (localizing) nonlinearity that is qualitatively different from the ones originating in ambient mass or density difference. The temperature-asymmetry-driven focusing-defocusing nonlinearity supports stable localized wave structures in 1-3 dimensions, which, for certain parameters, may have flat-top shapes.Item Coherently Controlled Quantum Emitters In Cavities(2010-02) Muller, A.; Flagg, E. B.; Deppe, D. G.; Salamo, G. J.; Shih, C. K.; Muller, A.; Flagg, E. B.; Shih, C. K.Semiconductor nanostructures such as quantum dots (QDs) have offered unique opportunities to investigate quantum optical effects in solid-state systems. These include quantum interference, Rabi oscillations, as well as photon antibunching, and were previously observable only in isolated atoms or ions. In addition, QDs can be integrated into optical microcavities, making them attractive for applications in quantum information processing and high efficiency quantum light sources. Despite much progress towards these goals, one area that was little explored is coherent control of such solid-state quantum emitters in cavities. The main technical hurdle lies in overcoming the laser background scattering. By using a sample structure in which QDs are embedded in a planar Fabry-Perot cavity and by using an orthogonal excitation geometry, we have achieved a nearly complete elimination of laser background scattering. This in turn allows us to show resonantly controlled light emission of quantum dots in the cavity including (a) Rabi flopping using pulse control, (b) direct observation of Mollow triplets in the frequency domain, and (c) simultaneously measured first-order and second order photon-photon correlations.Item Fundamentals of Stereolithography(1992) Jacobs, Paul F.It has only been a little over four years since the introduction of the first StereoLithography system, the SLA-1. From early 1988 until J.une 1992 over 300 SLA-1, SLA-250, SLA-190 and SLA-500 units have been sold by 3D Systems. These machines, currently operating in 20 countries on five continents, amount to about 90 percent of all the rapid prototyping systems now in use.