MODIFICATION OF A STRONG RESONANCE RADIATION POLARIZATION IN MEDIA WITH DOPPLER-BROADENED TRANSITIONS OF 0-]1-TYPES AND 1-]0-TYPES AND IN THE PRESENCE OF A DC ELECTRIC-FIELD
Sv. Fomichev, MODIFICATION OF A STRONG RESONANCE RADIATION POLARIZATION IN MEDIA WITH DOPPLER-BROADENED TRANSITIONS OF 0-]1-TYPES AND 1-]0-TYPES AND IN THE PRESENCE OF A DC ELECTRIC-FIELD, Journal of physics. B, Atomic molecular and optical physics, 28(17), 1995, pp. 3763-3782
For atomic media with resonant Doppler-broadened transitions of J = 0
--> J' = 1 or J = 1 --> J' = 0 type and taking into account the relaxa
tion due to depolarizing collisions, a theory of non-linear optical po
larization phenomena in the presence of a Dc electric field is develop
ed. The theory is valid in the case of both arbitrary resonance radiat
ion intensity and arbitrary external Dc electric field spatial orienta
tion. The intensity-dependent contributions to variation of radiation
polarization are analysed in detail in the Doppler limit. Special atte
ntion is paid to the case of linear polarization of incident radiation
; in this case as well as in the presence of a oc electric field, the
Doppler-enhanced non-linear optical contributions determining the emer
ging ellipticity and the rotation angle of polarization, respectively,
are of the same order of magnitude (unlike the case of external magne
tic field, in which the key effect is the rotation of polarization). I
t is shown, however, that in the case of the strictly transverse geome
try and if the angle between the electric field direction and the init
ial polarization vector is equal to 45 degrees, the Doppler-enhanced n
on-linear optical contribution to the rotation angle becomes anomalous
ly small. The effect of the presence of a longitudinal component of el
ectric field on the non-linear optical polarization phenomena is inves
tigated. In addition, although in the case of a purely longitudinal ge
ometry for the considered transitions the electric field effect on rad
iation polarization modification is absent, some analytic results conc
erning self-rotation and deformation of a polarization ellipse in the
Doppler limit for an intense initially elliptically polarized radiatio
n are also presented.