Results 251 to 260 of about 193,411 (276)

Cooperative cascade emission

Optics Communications, 1978
Abstract An experimental and theoretical study has been performed on the generating process of a cascade emission in a sample three-level system where the ground and the highest excited levels have been initially brought into a coherent superposition state by two-proton excitation.
Jumpei Okada, Kensuke Ikeda, Masahiro Matsuoka   +2 more
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Conical emission as cooperative fluorescence

Physical Review A, 1994
We have observed conical emission from a dense, strongly driven ensemble of two-level atoms without noticeable self-focusing. We present the arguments that conical emission, unaffected by autocollimation, is due to cooperative, [hacek C]erenkov-like, spontaneous emission of collisionally perturbed, optically dressed atoms rather than to parametric wave
, Chalupczak, , Gawlik, , Zachorowski
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Dimensional Dependence of Cooperative Emission

Nonlinear Optics, 2015
We study fluorescence of emitters coupled to radiation fields allowing for arbitrary interatomic spacing, dipole orientations, and spatial dimension, including the first complete solution in two dimensions. The asymptotic analysis shows coherence increases with reduced dimension.
Tyler Hill, Barry C. Sanders, Hui Deng
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Non‐cooperative and cooperative environmental corporate social responsibility with emission taxes

Managerial and Decision Economics, 2022
This study examines emission taxes and environmental corporate social responsibility (ECSR) under cooperative and non‐cooperative regimes, respectively, and compares Cournot and Bertrand competitions. We show that (i) there exists substitutability between emission taxes and ECSR, while the cooperative case always yields lower emission taxes and higher ...
Lili Xu, Sang‐Ho Lee
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Photoinduced Emission of Cooper Pairs from Superconductors

Physical Review Letters, 2003
Under certain conditions specified in this work, a Cooper pair can be emitted from a superconductor upon the absorption of one ultraviolet photon. The spectra of the excited electron pair carry direct information on the energy and angular pair correlation.
Konstantin A, Kouzakov, Jamal, Berakdar
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Line shifts in cooperative spontaneous emission

Optics Communications, 1970
Abstract Cooperative spontaneous emission, such as observed in photon echo experiments, is proved to be frequency shifted by a measurable amount with respect to the atomic transition frequency. The theory presented here is based on a renormalization procedure which rules out unobservable contributions.
F.T. Arecchi, D.M. Kim
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Theory of cooperative spontaneous emission

Soviet Journal of Quantum Electronics, 1978
An analysis is made of the deexcitation kinetics of strongly excited extended systems of initially uncorrelated two-level radiators. The possibility of partially cooperative states of the system is predicted when the radiation intensity acquires values intermediate between the spontaneous decay intensity and the Dicke superradiance intensity.
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Negative Emission Technologies and Climate Cooperation

SSRN Electronic Journal
Negative Emissions Technologies (NETs) — a range of methods to remove carbon dioxide from the atmosphere— are a crucial innovation in meeting temperature targets set by international climate agreements. However, mechanisms which undo the adverse consequences of short-sighted actions (as NETs) can fuel substitution effects and crowd out virtuous ...
Boldrini, Michela, Bosetti, Valentina, Nunnari, Salvatore   +2 more
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Cooperative emission study in ytterbium doped NdVO4

Journal of Luminescence, 2011
The infrared and visible cooperative emissions of ytterbium ions are studied in Yb-doped NdVO4 single crystals. The absorption of optical phonons allows the emissions at room temperature when a Nd:YAG laser is used. Low temperature emissions are observed due to the Nd3+ -> Yb3+ energy transfer following an argon ion laser excitation of the Nd3+ ions ...
Levesque Y, Jandl S, BETTINELLI, Marco Giovanni   +2 more
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Cooperative Effects in Spontaneous Emission

1973
We discuss the cooperative superradiant decay of N two-level atoms contained in a pencil-shaped volume. The Dicke “coherence brightening” - i.e. the emission of a hyperbolic secant pulse whose intensity is proportional to N2 and whose time duration is inversely proportional to N - occurs instead of the usual exponential decay under the following ...
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