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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Peculiarities of the magneto-optical resonances on 2p53s states in a NE glow discharge

А. П. Горбенко, Alexander Kuzmin, Vladimir A. Polischuk, Dimitar G. Slavov, L. Petrov, Ekaterina G. Borisova, G. Todorov

Published Jun 15, 2007• 0 citations
Publisher

Abstract

In continuation of our previous works, systematic investigation of the magneto-optical (MO) resonances from the 3P1(1s4) (Pashen notation), 3P2 (1s5), and 3P0 (1s3) levels of NeI was carried out. This study aims to clarify the formation mechanisms of the neon 1si (2p53s) states coherences. Anomalous MO resonances are experimentally observed and the possible mechanisms of their creation are discussed.

DOI
10.1117/12.751794

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In continuation of our previous works, systematic investigation of the magneto-optical (MO) resonances from the 3P1(1s4) (Pashen notation), 3P2 (1s5), and 3P0 (1s3) levels of NeI was carried out. This study aims to clarify the formation mechanisms of the neon 1si (2p53s) states coherences. Anomalous MO resonances are experimentally observed and the possible mechanisms of their creation are discussed.
Comparative studies of magneto-optical (MO) resonances and magneto-galvanic (MG) responses with and without resonant laser irradiation are earned out to establish the interconnection of the effects and the influence of the selfalignment destruction on the MO signal in positive column discharge. These studies aim to clarify the possible formation mechanisms of the neon Is, (2p 53s) states coherences and to examine the possibility to use the galvanic resonances for estimation of the relaxation constants of the neon lr state.
Four types of anomalous optical magnetic resonances shifted with respect to the zero magnetic field and with different shapes are found in radiation of a glow discharge in a mixture of even neon isotopes placed in a swept longitudinal magnetic field. This testifies to the manifestation of collective processes of synchronous light emission by oscillators belonging to isotopically different spatially separated atoms in discharge plasma. The origin of resonances is associated with nonstationary interference of reactive fields in the near radiation-field zones of emission of atoms, averaged over the lifetime of the fields (interference), while different types of resonances are associated with different methods of synchronization of the phases of the fields.
Summary form only given, as follows. We investigated the hidden alignment of Ne plasma in a magnetic field observing the optical characteristics of the medium-absorption and refraction. A tunable single frequency laser beam was used as a probe beam. Depending on the direction of the applied magnetic field and the geometry of observation, the dependence of the plasma birefringence or dichroism on the magnetic field was registered. The dye laser was tuned to /spl lambda/=607.4 nm (2p/sub 3/-1s/sub 4/ Ne transition). The dependence on the external magnetic field of the laser beam intensity passed through the Ne discharge cell was registered, for various laser frequencies in the limits of the absorption line. At the edge of the absorption line, the signal of the dichroism consists of two Lorentzian components while at the center of the absorption line the wide component is absent. The wide component width depends on neon pressure as: H(P)=(1.64/spl plusmn/0.03) gauss + P(torr) (0.33/spl plusmn/0.08) gauss/torr. This value is in a good agreement with other results concerning the lifetime of the 1s/sub 4/ state. The mechanism of alignment formation in this state is not clear. This state could not be aligned by light absorption following a quantitative calculation. The irradiation of atoms is isotropic within the limits of all the absorption line because of the high magnitude of absorption for the 1s/sub 4/-1s/sub 0/ transition. We consider the optical pumping as the most probable mechanism for alignment of this state. The magnitude of absorption on the s-p neon transitions are not high. The intensity of the spontaneous emission beam along the tube is greater than in the perpendicular direction. If the quantization axis coincides with the tube axis, this beam empties the magnetic sublevels with M=/spl plusmn/1, thus creating longitudinal alignment. The absence of a signal at the center of the absorption line can be explained by the high selfabsorption on the s-p transitions. The width of the narrow component of the signal is approximately 0.7 gauss. Its pressure dependence is small. We have established experimentally the absence of signals of such width in the spontaneous emission from 2p levels. Hence, all optical mechanisms of alignment transmission from higher or from lower states to the 1s/sub 4/ state are excluded. Apparently this signal arises from alignment of metastable state 1s/sub 5/. In our opinion the collisions are the most probable mechanism of alignment transmission.
The dichroism of a neon gas discharge plasma in a weak magnetic field is investigated by scanning the 3 s 2 -2 p 4 transition by monochromatic laser radiation. Magneto-optical resonances of the intrinsic macroscopic alignment and hidden alignment of the 2 p 4 level are separated. Against the background of these resonances, resonances attributed to coherence transfer from the 1 s 2, 4, 5 levels and the birefringence of the wings of the nearest absorption lines from the 1 s 4, 5 levels are observed. A new type of alignment is revealed—integral hidden alignment, whose lifetime, in contrast to the case with macroscopic alignment, increases without bound with increasing radiation trapping.