Polarization of spontaneous emission from aligned laser atoms

幹郎 塚越

Chunling Ding, Jiahua Li, Rong Yu +2 more

Manipulation of spontaneous emission from an atom confined in three kinds of modified reservoirs has been investigated by means of an elliptically polarized laser field. Some interesting phenomena such as the multi-peak structure, extreme spectral narrowing, and cancellation of spontaneous emission can be observed by adjusting controllable system parameters. Moreover, these phenomena depend on the constructive or destructive quantum interference between multiple decay channels and which can be changed appreciably by varying the phase difference between the two circularly polarized components of the probe field. These results demonstrate the importance of an elliptically polarized laser field in controlling the spontaneous emission and its potential applications in high-precision spectroscopy.

Alexander P. Blokhin, Nikolai A. Borisevich, I. I. Kalosha +1 more

V. N. Rebane, T. K. Rebane

The linear polarization of quadrupole emission by the J=2-J 0=0 transition under conditions of laser excitation in a gas medium is studied. Cases of excitation through dipole and quadrupole absorption of monochromatic laser radiation are considered. Taking into account the anisotropy of collisional relaxation, the contributions of polarization moments of the second and fourth ranks, i.e., those with usual and hexadecapole alignments, to the signal of linear polarization of quadrupole emission are calculated. The dependence of this signal on the laser frequency, the density of the gas medium, and the angles determining the orientation of the system of axes of observation of light polarization relative to a laser ray is studied. The numerical calculations of contributions of usual and hexadecapole alignment to the signal of linear polarization are made for the magnetic quadrupole transition J=2-J 0=0 between the states 2p 5(2 P 1 2/0 )3p′[3/2]2 and 2p 5(2 P 1 2/0 )3s 3s′[1/2]0 of neon atoms in the xenon atmosphere.

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

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.

A. D. Gazazyan, Y. Pashayan-Leroy