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Journal of Physics B Atomic and Molecular Physics

Peculiarities of the spontaneous emission from a laser oscillating on two optically connected transitions

Emilia A. Alipieva, P. R. Karavassilev, G. Todorov

Published Dec 28, 1985• 0 citations
Publisher

Abstract

Presents a theoretical investigation of some peculiarities of alignment signals from laser levels carried out in simultaneous oscillation of two transitions connected by spontaneous emission. An expression is obtained for a spontaneous emission part caused by the oscillations origination from the laser level. It is shown that the population transfer exceeds the coherence transfer significantly. That is why the spontaneous emission part has opposite signs in two orthogonal polarisations under certain conditions. The more important results are verified experimentally at 1152.3 and 1161.4 nm He-Ne laser oscillation.

DOI
10.1088/0022-3700/18/24/014

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Presents a theoretical investigation of some peculiarities of alignment signals from laser levels carried out in simultaneous oscillation of two transitions connected by spontaneous emission. An expression is obtained for a spontaneous emission part caused by the oscillations origination from the laser level. It is shown that the population transfer exceeds the coherence transfer significantly. That is why the spontaneous emission part has opposite signs in two orthogonal polarisations under certain conditions. The more important results are verified experimentally at 1152.3 and 1161.4 nm He-Ne laser oscillation.
Possibility of coherent control of spontaneous emission from four- and five-level systems in the laser radiation field is studied. The four-level system consists of two levels resonantly driven by laser radiation where either of levels may decay to a separate level. For such a system we show that the presence of the second decay channel may deteriorate the destructive interference occurring because of Autler-Townes effect in case of one decay channel. The five-level system represents two two-level resonantly driven systems with the upper levels decaying to a common level. For this case, the interference between the two decay channels is partially or completely destructive or constructive depending on the initial conditions and on the mutual orientation of the transition dipole moments. It is shown that population transfer takes place by the same quantum vacuum via spontaneous emission. The populations are shown to have damping oscillatory nature.
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Recently, correlated spontaneous emission in a laser of three-level atoms has been analyzed theoretically and has been demonstrated experimentally using a three-level He-Ne Zeeman laser. We demonstrate that correlated spontaneous emission is also feasible in a semiconductor laser with a long extended cavity. As a result, the heterodyned spectral width between two lasing modes in a grating extended-cavity laser was reduced to below the spontaneous emission noise level. The laser can be used for high-precision optical-heterodyne sensing.
In this article we study the potential for coherently control spontaneous emission in a four-level scheme. Our control parameter is the relative phase of two laser fields having the same angular frequency. We investigate in detail the trapping conditions, the population dynamics and the behaviour of the (long time) spontaneous emission spectrum, which are now phase dependent. Inhibition of spontaneous emission and extreme spectral narrowing are shown as the relative phase is varied. Our results are interpreted using a dressed state analysis of the dynamics.
We report the experimental observation of a superradiant emission emanating from an elongated dense ensemble of laser cooled two-level atoms, with a radial extent smaller than the transition wavelength. In the presence of a strong driving laser, we observe that the system is superradiant along its symmmetry axis. This occurs even though the driving laser is orthogonal to the superradiance direction. This superradiance modifies the spontaneous emission, and, resultantly, the Rabi oscillations. We also investigate Dicke superradiance in the emission of an almost fully inverted system as a function of the atom number. The experimental results are in qualitative agreement with ab-initio, beyond-mean-field calculations.
We use a three-state model for an atom or molecule in which two transitions are simultaneously driven by the oscillating electric fields of two laser beams. The amplitudes and detunings of the applied oscillating fields vary during the optical pulse, which can cause transitions from one state to another. For some special cases not previously known, the transition probabilities and probabilities of no transition are obtained analytically. We give conditions for complete transfer of the atomic population from one state to another, and for complete return to the initial state.