Showing papers by "Richard Kowarschik published in 2002"
TL;DR: In this paper, the field of an electric dipole inside an arbitrary system of parallel slabs is evaluated with a Green's function approach with a matrix formalism that allows compact formulation of the problem.
Abstract: The field of an electric dipole inside an arbitrary system of parallel slabs is evaluated with a Green’s function approach. Application of boundary conditions yields a matrix formalism that allows compact formulation of the problem. The method is extended to the general case of parallel stratified medialike cavities containing a dipole. Effects on spontaneous-emission rate of dipole emitters are evaluated and discussed for different types of planar microcavities.
62 citations
TL;DR: In this article, the lifetime of thin, rhodamine 6G-doped polymer layers in front of a mirror has been determined as a function of the emitter-mirror separation and the conditions of excitation and observation.
Abstract: Fluorescence lifetimes of thin, rhodamine 6G-doped polymer layers in front of a mirror have been determined as a function of the emitter-mirror separation and the conditions of excitation and observation. Lifetime is well known to depend on the spatial emitter-mirror separation. The explanation of experimental data needs to consider direction, polarization, and numerical aperture of the experimental system. As predicted theoretically, experimental results depend on the conditions of illumination and observation, because of the different lifetimes of emitters aligned horizontally or vertically with respect to the plane of interfaces and their selection by the experimental system. This effect is not observable when ions are used as a source of fluorescence, because ensemble averaging depends on the properties of sources.
33 citations
19 Jun 2002
TL;DR: In this paper, the shape of objects using color coding by stochastically geneated fringe patterns has been shown to be useful for object shape measurement, and a possibility for a rapid measurement of object shape with color coding has been proposed.
Abstract: We show a possibility for a rapid measurement of the shape of objects using color coding by stochastically geneated fringe patterns.
3 citations
TL;DR: In this paper, an experimental method based on two-and four-wave mixing was developed to estimate the value of the suggested field inside the crystal, where they used a BCT crystal grown by Kuper and co-workers from the University of Osnabruck.
Abstract: Ba0.77Ca0.23TiO3 (BCT) crystals have interesting photorefractive and electrooptic properties, as was recently demonstrated in several papers. Analysing these results and our own experiments, we have come to the conclusion that there is an effective bulk electric field inside the crystal. In order to estimate the value of the suggested field inside the crystal we have developed an experimental method based on two-and four-wave mixing presented in this paper, where we use a BCT crystal grown by Kuper and co-workers from the University of Osnabruck. Knowing the value of the bulk field we have estimated the value of the effective photoconductivity of the crystal.
3 citations
TL;DR: In this article, the generation of oscillations in a ring self-pumped phase-conjugate mirror (RSPPCM) with a photorefractive Ba 0.77 Ca 0.23 TiO 3 crystal (BCT) active medium is shown.
1 citations