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DETERMINATION OF THE AVERAGE TIME INTERVAL BETWEEN TWO PHOTONS WITH SUB-OPTICAL PERIOD ACCURACY

December 1988
Optics News 14(12)

DOI:10.1364/ON.14.12.000023

Authors:

The fourth-order interference between entangled state photon pairs with different frequencies

Article

Aug 2002

One of the nonclassical effects in two-photon interference experiments, spatial quantum beating, is observed in fourth-order interference with pairs of photons produced by a spontaneous parametric down-conversion process. When photon pairs in different frequencies and are mixed together, and directed to two detectors, the coincidence counts exhibit a cosine modulation with difference frequency | - |. The measured coincidence counts turned out to have an interference pattern with periodicity of 10.45 ㎛ in position or 34.82fs in time delay, which corresponds to the period 2/| - | for the beat frequency of 0.29Hz.

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July 1956 · Tumori Journal

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Serial roentgenographic controls of a costal angioma treated by a single cycle of high roentgen doses are presented. They show the modifications induced by the ionizing radiations in a seven year period. The evidence for recovery is given by disappearance of clinical symptoms with reduction of the involved soft parts rather than by return to normality of the costal radiographic picture.

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Thin periodic structures depend on two interrelated small geometric parameters ε and h(ε) which control the thickness of constituents and the cell of periodicity. We study homogenisation of elasticity theory problems on these structures by method of asymptotic expansions. A particular attention is paid to the case of critical thickness when lim ε→0 h(ε)ε -1 is a positive constant. Planar grids ... [Show full abstract] are taken as a model example.

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Based on the extended hyperbolic functions method, we obtain the multiple exact explicit solutions of the Klein–Gordon–Zakharov equations. The solutions obtained in this paper include (a) the solitary wave solutions of bell-type for u and n, (b) the solitary wave solutions of kink-type for u and bell-type for n, (c) the solitary wave solutions of a compound of the bell-type and the kink-type for ... [Show full abstract] u and n, (d) the singular traveling wave solutions, (e) periodic traveling wave solutions of triangle function types, and solitary wave solutions of rational function types. We not only rederive all known solutions of the Klein–Gordon–Zakharov equations in a systematic way but also obtain several entirely new and more general solutions. The variety of structures of the exact solutions of the Klein–Gordon–Zakharov equations is illustrated.

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A Note on Minimal Covers

November 1988 · ACM SIGMOD Record

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