Abstract
In this work we investigated propagation of ultrashort laser pulses in Tellurite glass codoped Er3+/Tm3+. We derived a general propagation equation of pulses which includes the linear and nonlinear effects to all orders. We studied in the specific case of Kerr media and obtained an ultrashort pulse propagation equation called a generalized nonlinear Schrödinger equation. The impact of the third order dispersion, the higher-order nonlinear terms self-steepening, and stimulated Raman scattering are explicitly analyzed.
Highlights
Theoretical and experimental research for the propagation process of ultrashort laser pulses in a medium have been the subject of intensive research within the last few years [1,2,4]
Because of special properties of these pulses, during their propagation in the medium several new effects have been observed in comparison with the propagation process of short pulses, namely the effects of dispersion and nonlinear effects of higher orders
An interesting manifestation of the intensity dependence of the refractive index in nonlinear optical media occurs through self-phase modulation (SPM), a phenomenon that leads to spectral broadening of optical pulses [10]
Summary
Theoretical and experimental research for the propagation process of ultrashort laser pulses (in fs) in a medium have been the subject of intensive research within the last few years [1,2,4]. Under the influence of these effects, we have complicated changes both in amplitude and spectrum of the pulse It splits into constituents and its spectrum evolves into several bands which are known as optical shock and self-frequency shift phenomena [1,2,3]. These effects should be studied in detail for future concrete applications of femtosecond pulses, especially in the domain of optical communication. This formalism is based on the approximate expansion of the nonlinear wave equation, which treats the nonlinear processes involved in the problem as the perturbations. Http://www.granthaalayah.com ©International Journal of Research - GRANTHAALAYAH [96]
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