Seminario
Random (without cavity) laser with cold atoms: theoretical and experimental challenges
Dr. Vitalie Eremeev, Facultad de Fisica, Pontificia Universidad
Catolica de Chile, Santiago, Chile.
Abstract:Because the subject proposed for the discussion is very
particular and
yet not well known, I will start with the introduction to the
experimental
and theoretical achievements in the field. In order to develop the
theory
for random laser with cold atoms at first step is presented the
theoretical
model discussed in [1] which explains the gain and the lasing processes
with cold atoms confined in the cavity and the results are compared with
the experimental data. In particular we have studied the Mollow gain
mechanism for the cold atoms by considering the dressed-states formalism
for the two-level atoms. Taking into account the method discussed in
[2] we derived the semiclassical kinetic equations for
quantum-mechanical
expectation values of operators, which describe the coupled system of
atoms and modes of the electromagnetic field. We studied the field
dynamics
for which found different regimes of the laser evolution, therefore
the spectra for these regimes were calculated in order to understand the
effects, which appear. Based on some ideas of this model but taking into
account a different method for the quantization of the laser field [3]
we
build further the theory for random lasers. Concerning this problem the
methodology and some prior results are presented while the study is
still
in progress.
References
[1] W. Guerin, N. Mercadier, F. Michaud, D. Brivio, L.S. Froufe-Pérez,
R.
Carminati, V. Eremeev, A. Goetschy, S.E. Skipetrov, R. Kaiser, J. of
Optics
12, 024002 (2010).
[2] J. Zakrzewski, M. Lewenstein, Phys. Rev. A 45, 2057 (1992).
[3] C. Viviescas and G. Hackenbroich, Phys. Rev. A 67, 013805 (2003).