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International Conference Laser Optics (ICLO)

The amplification of transform-limited pulses in media with homogeneously broadened line

Vladimir Alekseevich Petrov, Купцов Глеб Владимирович, Victor V. Petrov, Alexei V. Laptev, Anatoliy V. Kirpichnikov, Efim V. Pestryakov

Published Jun 1, 2016• 0 citations
Publisher

Abstract

We propose the model of the amplification of the transform-limited pulses in a homogeneously broadened medium. The model provides the information about the output characteristics of an unchirped pulse after passing through an active homogeneously broadened medium and about the population inversion inside the medium at any moment of time.
DOI
10.1109/lo.2016.7549667

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The recent experiments on a pulsed superfluorescence and prospects of a CW superradiant lasing in various active media, especially semiconductor heterostructures, [1] attract much attention to new coherent dynamical effects in such lasers. These effects take place in the case of very dense active medium and low-Q cavities when a photon (cavity) lifetime is much shorter than a polarization (optical dipole) lifetime of an active center. Here, on the basis of numerical modeling of the Maxwell-Bloch equations, we describe the steady and dynamic spontaneous symmetry breaking of the structure of the field, polarization and population inversion of an active medium with almost homogeneously broadened spectral line placed into a symmetric low-Q combined distributed feedback (DFB) Fabry-Perot cavity.
A calculation is made of the steady-state population inversion distribution in homogeneously pumped active media of spherical or cylindrical form. It is assumed that reflections from the boundaries of the active medium have been completely eliminated and it is shown that the inversion decrease, caused by the amplification of spontaneously emitted radiation, is mainly a function of the overall volume of the active medium. For active media of equal volume, the stored inversion is minimal for a sphere.