11 research outputs found
A stochastic model of the influence of buffer gas collisions on Mollow spectra
In this paper we consider the influence of collisional fluctuations on the
Mollow spectra of resonance fluorescence (RF). The fluctuations are taken into
account by a simple shift of the constant detuning, involved in a set of
optical Bloch equations by collision frequency noise which is modelled by a
two-step random telegraph signal (RTS). We consider in detail the Mollow
spectra for RF in the case of an arbitrary detuning of the laser frequency,
where the emitter is a member of a statistical ensemble in thermodynamic
equilibrium with the buffer gas at temperature which is treated as a
colored environment, and velocity is distributed with the Maxwell-Boltzmann
density
An exact soluble equation for the steady state probability distribution in a nonlinear system: application to the noise reduction in Raman Ring Laser
Pulse propagation in an autoionization medium with double Fano profile
We discuss the propagation of a short laser pulse in an auto- ionizing (AI) medium with degenerate double Fano model. By solving numerically the coupled equations for atoms and fields we show that by the proper choice of Fano parameters involved in the problem (contrary to the case considered in (E. Paspalakis, N. J. Kylstra, and P. L. Knight, Phys. Rev. A60 (1999)) we have now two Fano asymmetry parameters) one can eliminate almost completely the absorption in the pulse propagation. It means that we have the transparency in the medium. From the connection between population trapping in short pulsed laser field and transparency in the propagation of the laser pulse which has been fixed by Paspalakis et al., Phys. Rev. A60 (1999) we conclude that this proper choice leads to the presence of the population trapping (or the existence of the “dark” states) in the atomic system. Moreover, instead of one value of the laser detuning for which the dark states exist in the case of one AI level, we find numerically two such values in the case of two AI levels