| عنوان مجله
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European Physical Journal Plus
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| کلیدواژهها
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Cavity quantum electrodynamics, Master equation, Multi-photon transition, Matrix
continued fractions, Lasing without inversion
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| چکیده
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A three-level atom in Λ con figuration trapped in a single-mode Fabry-Perot optical cavity. It
is assumed that the transition between levels 2 and 3 in the atom is accomplished through the number
of q photons. To solve the steady-state master equation for the atom-cavity system, the matrix continued
fraction method for applied physical quantities is used. The results show that by raising the number of
transitions, the curves of the population inversion fi nally overlap with one another and the output mean
photon number from the optical cavity rises as well as the laser effect appears in the system. On the
other hand, the outcomes reveal that by increasing the number of transitions despite the negativity of the
population inversion, the number of output photons from the cavity grows and lasing interval becomes
larger. Eventually the steps of the transformation from the three-level atom to two-level one in the case
of multi-photon transition under several speci fic conditions have been studied. The obtained results of
the simulations con firm the accuracy of the used approximations in the two-level pattern appropriately.
In summary, lasing process without population inversion along with the multi-photon transition in the
three-level atom is discussed.
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