Excitation spectra of a three-level atom in the "lambda" configuration at high photon densities. II. Numerical results

1982 ◽  
Vol 60 (7) ◽  
pp. 968-976 ◽  
Author(s):  
K. J. Woloschuk ◽  
S. Hontzeas ◽  
Constantine Mavroyannis
Keyword(s):  
Electromagnetic Field ◽  
Laser Field ◽  
Excitation Spectra ◽  
Two Photon ◽  
Level Atom ◽  
Forbidden Transition ◽  
Wide Range ◽  
Spectral Intensities ◽  
Photon Resonance ◽  
Resonance Process

We have performed a numerical calculation for the excitation spectra arising from the interaction of a three-level atom in the lambda configuration with a strong electromagnetic field whose frequency mode is initially populated. The excitation spectra are considered for equal detunings, which refer to the cooperative two-photon resonance process, as well as for different detunings. The computed cooperative two-photon resonance spectra are compared with those derived by analytical methods. In the presence of different detunings, conditions are established under which the laser field induces sidebands at the frequency equal to that for the forbidden transition. Numerical calculations for a wide range of Rabi frequencies and detunings are presented graphically. Detailed discussion of the computed spectral intensities is given and a comparison is made between the spectra of three-level atoms in the lambda and cascade configurations.

INTERACTION OF A THREE-LEVEL ATOM WITH A SINGLE-MODE FIELD IN A TWO PHOTON RESONANT CAVITY

2011 ◽  
Vol 25 (03) ◽  
pp. 417-431
Author(s):  
DEBRAJ NATH ◽  
P. K. DAS
Keyword(s):  
Electromagnetic Field ◽  
Resonant Cavity ◽  
Single Mode ◽  
Atomic Level ◽  
Atomic Inversion ◽  
Cooperative Effects ◽  
Two Photon ◽  
Mode Field ◽  
Level Atom ◽  
Successive Passage

In this paper we discuss an extension of Jaynes–Cummings model by adding a further atomic level to support a second resonance and cooperative effects in multi-atom systems. A successive passage of a three-level atom in the V configuration interacting with one quantized mode of electromagnetic field in a cavity will be considered to study atomic inversion and entropy evolution of the state.

Resonance fluorescence spectra from a three level atom interacting with a strong bichromatic field: induced two photon transitions

1983 ◽  
Vol 61 (1) ◽  
pp. 15-29 ◽  
Author(s):  
Douglas A. Hutchinson ◽  
Christine Downie ◽  
Constantine Mavroyannis
Keyword(s):  
Ground State ◽  
Rabi Frequency ◽  
Resonance Fluorescence ◽  
Excitation Spectra ◽  
Laser Fields ◽  
Two Photon ◽  
Photon Transition ◽  
Level Atom ◽  
Photon Excitation ◽  
The One

This investigation describes the interaction of a three level atom with two laser fields. One of the transitions from the ground state is in resonance with twice the frequency of the first laser and the other transition from the ground state is in resonance with the second laser. The Green's function formalism is used to derive expressions from which the induced two photon and one photon excitation spectra are computed. Also, approximate expressions are derived for the excitation spectra in the appropriate frequency regions. These results agree well with the numerical computations based upon the precise expressions. The interference between the two transitions produce some splittings; these splittings depend upon the Rabi frequency of the one photon transition. The intensities of the weak peaks depend upon the ratio of the Rabi frequency of the two photon transition to the frequency of the first laser. Some features of the excitation spectra are interpreted in terms of previous knowledge about the behavior of two level atoms in strong laser fields.

Optical mixing of frequencies of a strong bichromatic field interacting with a three-level atom. II. Numerical results

1982 ◽  
Vol 60 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Constantine Mavroyannis ◽  
K. J. Woloschuk ◽  
D. A. Hutchinson ◽  
Christine Downie
Keyword(s):  
Ground State ◽  
Laser Field ◽  
Excitation Spectra ◽  
Laser Fields ◽  
Level Atom ◽  
Reduced Frequency ◽  
Spontaneous Emission Probability ◽  
Bichromatic Field ◽  
Optical Mixing ◽  
Selection Of

We have numerically calculated the excitation spectra arising from the 3rd order mixing of the frequencies ωa and ωb of two laser fields interacting with a three-level atom, where each laser field resonantly couples the ground state with each excited state of the atom, respectively. In the limit of high photon densities, the excitation spectra near the reduced frequency X = (ω−ωa + 2ωb)/γ0 ≈ 0 are considered as a function of the reduced Rabi frequencies ηa and ηb of the two laser fields, respectively and γ0 is the spontaneous emission probability. For ηa < ηb the spectra consist of a doublet peaked at [Formula: see text] and its intensity is constant. When ηa = ηb, the spectra are composed of five pairs of bands peaked at [Formula: see text], and [Formula: see text]. When ηa < ηb the computed spectra consist of five pairs of bands, where the intensities of the peaks at [Formula: see text] and [Formula: see text] are positive indicating absorption, those at [Formula: see text] are negative implying amplification, and the two pairs of peaks at [Formula: see text] have positive and negative components describing the mixed process of absorption–amplification. The intensities of these bands are found to vary as (ηa/ηb)2 for (ηa/ηb) > 1 and, therefore, the intensities of the bands are immensely enhanced as the value of the ratio (ηa/ηb) increases. The computed spectra for a wide selection of Rabi frequencies are graphically presented and compared with those derived by analytical methods.

scholarly journals Phase correlation during two-photon resonance process in an active cavity

2020 ◽  
Vol 59 (3) ◽  
pp. 866 ◽  
Author(s):  
Zifan Zhou ◽  
Nicholas J. Condon ◽  
Devin J. Hileman ◽  
Shih C. Tseng ◽  
Selim M. Shahriar
Keyword(s):  
Phase Correlation ◽  
Two Photon ◽  
Photon Resonance ◽  
Resonance Process

A laser-excited three-level atom

1990 ◽  
Vol 68 (3) ◽  
pp. 321-333 ◽  
Author(s):  
Constantine Mavroyannis
Keyword(s):  
Excited States ◽  
Laser Field ◽  
Excitation Spectra ◽  
Spectral Functions ◽  
Laser Fields ◽  
At Resonance ◽  
Level Atom ◽  
Short Lifetime ◽  
Strong Transition ◽  
Long Lifetime

We considered the excitation spectra for the excited states of a three-level atom, where the strong and the weak atomic transitions are driven by resonant and nonresonant laser fields, respectively. The spectral functions describing the excitation spectra for the electric dipole allowed excited state and for the metastable state of the atom have been derived when both laser fields are quantized as well as when they are treated as classical entities. In the low-intensity limit of the laser field operating in the strong transition, there are two short-lifetime excitations, the spontaneous one and the induced one, which appear at the same frequency, and a long-lifetime excitation induced by the weak laser field. These excitations compete with each other at resonance as well as at finite detunings of the weak laser field. In the high-intensity limit of the laser field operating in the strong transition, the competition is between the short- and the long-lifetime side bands, which are induced by the strong and the weak laser fields, respectively. The ratio of the maximum intensities of the peaks describing the long- and the short-lifetime excitations exhibits a resonance variation with the detuning of the weak laser field. Comparison between the results obtained when the laser fields are treated as quantized and as classical entities is made.

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