Based on the transmission experimental spectra of Er3+ -doped Ti:LiNbO3 optical waveguides in this paper we report
some experimental and theoretical results concerning the evaluation of the the radiative lifetime and the real and
imaginary parts of the complex atomic susceptibility of the above mentioned waveguides in the visible and near infrared
spectral range.
The homogeneous absorption and emission cross sections were determined from the the corresponding
experimental transmission spectra around 1550 nm, 980 nm and 550 nm using the density matrix formalism and the
McCumber's theory and taking into account the Stark splitting of the levels.
Light transport is currently used clinically both as a therapeutic tool and as a diagnostic tool. A concern in all these cases
is the difficulty of knowing which regions of the tissues are sufficiently illuminated for therapeutic results, or from which
regions the collected fluorescence was emitted. Development of optical models that explain the observed scattering
properties of soft biological tissues is of considerable interest. Such modeling can give how the scattering properties are
influenced by the numbers, sizes and arrangements of the tissue structure. In this article we give a brief overview of the
laser light transport in tissue and also discuss some representative applications of tissue optics for biomedical
applications.
The study of dynamics of spatial solitons in nonlinear and unidimesional fotonic crystals, with a periodical and nonlinear
fotonic network which is generated by Dirac function is presented. Are analysed comparisons and differences which
appear in development of periodical models describes by nonlinear Schrödinger equation. Also, is developed theory of
couple models for periodical modulation of refractive index.
Fudamental theory of spatial solitons are based to obtain discrete nonlinear Schrödinger equation with analyze of
stationary solutions on discrete models.
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