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Springer eBooks

Spatiotemporal dynamics of three-level inversionless lasers

J. Mompart, V. Ahufinger, R. Corbalán, Jordi García‐Ojalvo, M. C. Torrent, Ramon A. Vilaseca

Published Jan 1, 2003• 1 citation
Publisher
DOI
10.1007/978-1-4419-8907-9_188

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Summary form only given. It is well known that in dense media the effective field acting on an atom/molecule is no longer the macroscopic field but the so-called local field, which is due to all external sources and to all dipole moments of the atoms/molecules within the sample except the one under consideration. The inclusion of the local field effects gives rise to the prediction of a large number of interesting phenomena in optical systems, such as spectral red shifts, mirrorless optical bistability, "piezophotonic" effects, and enhancement of inversionless gain and absorptionless index in lasing without inversion. As an example, a density of 10/sup 17/ atoms/cm/sup 3/ of sodium atoms is sufficient to give rise to a shift of about 1 GHz of the sodium D line. We analyze here the role of the local field effects on the spatiotemporal dynamics of broad-area homogeneously broadened three-level lasers. In these three-level systems, laser emission in one atomic transition is investigated while an external plane-wave driving laser couples an adjacent transition. Due to the interplay between atomic nonlinearities and light diffraction, the optical wavevector of the generated laser field develops a small component in the transverse plane, i.e., the emitted laser beam is slightly tilted with respect to the cavity-axis.

Conference on Lasers and Electro-Optics•Aug 29, 2005•0 citations
We investigate analytically and numerically the role of diffraction in the operation of a broad-area inversionless laser in a cascade three-level configuration. Through a linear stability analysis of the trivial non-lasing solution and numerical integration of the corresponding Maxwell–Schrödinger equations, we show that off-axis emission allows stationary inversionless lasing over a cavity detuning range much larger than in small-aspect-ratio cavities and in conventionally inverted three-level lasers. In addition, we investigate inversionless lasing in a self-pulsing regime in the presence of diffraction, which leads to rich spatiotemporal dynamics.
Summary form only given. It is well known that in dense media the effective field acting on an atom/molecule is no longer the macroscopic field but the so-called local field, which is due to all external sources and to all dipole moments of the atoms/molecules within the sample except the one under consideration. The inclusion of the local field effects gives rise to the prediction of a large number of interesting phenomena in optical systems, such as spectral red shifts, mirrorless optical bistability, "piezophotonic" effects, and enhancement of inversionless gain and absorptionless index in lasing without inversion. As an example, a density of 10/sup 17/ atoms/cm/sup 3/ of sodium atoms is sufficient to give rise to a shift of about 1 GHz of the sodium D line. We analyze here the role of the local field effects on the spatiotemporal dynamics of broad-area homogeneously broadened three-level lasers. In these three-level systems, laser emission in one atomic transition is investigated while an external plane-wave driving laser couples an adjacent transition. Due to the interplay between atomic nonlinearities and light diffraction, the optical wavevector of the generated laser field develops a small component in the transverse plane, i.e., the emitted laser beam is slightly tilted with respect to the cavity-axis.