4.1.2.1 Quasi-Classical Laser Representation and Description
of the Two-Level Model
Let us consider a laser model containing the active medium (optical amplifier) and
the single-mode resonator of “traveling-wave” formed by mirrors, as shown in
Fig. 3.2a.
An electromagnetic field affects the active medium and produces the electric
polarization of the medium. According to the electric dipole model of interaction
(based on Maxwell equations), the OA polarization is the energy source for induced
EMF. Amplitude and phase of possible field self-oscillations defined from the field
self-consistent conditions (or from the phase and amplitude balance equations for
EMF) states that the field is excited (or induced) should be equal to the initial field.
Figure 4.2 shows the laser model with the traveling-wave resonator, in which the
active medium (OA) under the influence of energetic pumping is schematically
shown. The EMF oscillation is applied into an optical input of OA. The optically
active medium (OA) is presented in Fig. 4.2a, while the two-level pumping scheme
is presented in Fig. 4.2b. Figure 4.2c shows the dipole representation of the OA
atom.
Fig. 4.2 The laser model under the influence of energetic pumping. The EMF oscillation is applied
in the OA input. (а) optical amplifier, (b) double-level pumping scheme of OA, (c) the dipole
representation of the active medium atom
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4 Semiclassical Theory and Laser Differential Equations for Optoelectronic. . .
of the Two-Level Model
Let us consider a laser model containing the active medium (optical amplifier) and
the single-mode resonator of “traveling-wave” formed by mirrors, as shown in
Fig. 3.2a.
An electromagnetic field affects the active medium and produces the electric
polarization of the medium. According to the electric dipole model of interaction
(based on Maxwell equations), the OA polarization is the energy source for induced
EMF. Amplitude and phase of possible field self-oscillations defined from the field
self-consistent conditions (or from the phase and amplitude balance equations for
EMF) states that the field is excited (or induced) should be equal to the initial field.
Figure 4.2 shows the laser model with the traveling-wave resonator, in which the
active medium (OA) under the influence of energetic pumping is schematically
shown. The EMF oscillation is applied into an optical input of OA. The optically
active medium (OA) is presented in Fig. 4.2a, while the two-level pumping scheme
is presented in Fig. 4.2b. Figure 4.2c shows the dipole representation of the OA
atom.
Fig. 4.2 The laser model under the influence of energetic pumping. The EMF oscillation is applied
in the OA input. (а) optical amplifier, (b) double-level pumping scheme of OA, (c) the dipole
representation of the active medium atom
138
4 Semiclassical Theory and Laser Differential Equations for Optoelectronic. . .