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

Nonlinear effects in the interaction of elliptically polarized laser radiation with a strong absorbing molecular gas

V. I. Romanenko, Yelena G. Udovitskaya, Ruslan A. Malitskiy, Леонід Петрович Яценко

Published Jul 20, 2004• 0 citations
Publisher

Abstract

The interaction of circularly polarized weak probe wave with the molecular iodine driven by the strong pump wave with the opposite polarization has been theoretically studied. It is shown that the phenomenon of electromagnetically induced transparency in the iodine vapour can be observed for moderate intensity (~10-100 W/cm2) of the pump wave. The group velocity of the probe wave can decrease to 0.1c.

DOI
10.1117/12.570018

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Optics and Spectroscopy•Jul 1, 2001•8 citations
The interaction of circularly polarized weak probe wave with the molecular iodine driven by the strong pump wave with the opposite polarization has been theoretically studied. It is shown that the phenomenon of electromagnetically induced transparency in the iodine vapour can be observed for moderate intensity (~10-100 W/cm2) of the pump wave. The group velocity of the probe wave can decrease to 0.1c.
A theoretical calculation of the polarization changes of a weak probe laser beam as it traverses a strongly pumped gaseous atomic medium is presented. The medium is chosen to be a three-level cascade (J = 0–J = 1–J = 0) system. The polarization of the probe changes from linear to elliptical owing to the asymmetrical population transfer induced by a strong, circularly polarized pumping laser beam. We study this phenomenon as a function of laser intensities, laser detunings, and the relaxation parameters of the medium. We compare the predictions of the theory with results obtained from experimental studies of the neon 1s4(J = 1)–2p4(J = 2)–3s2(J = 1) system.
The conclusions of a theoretical study of the dependence of the characteristics of the phenomenon of electromagnetically induced transparency on the pulse intensity of the input probe radiation under elliptical polarization of laser fields have been reported. The analysis has been carried out for the Ʌ-scheme of inhomogeneously broadened quantum transitions between the levels 3P0{}^{3}{{P}_{0}}3P0​ , 3P10{}^{3}P_{1}^{0}3P10​ , and 3P2{}^{3}{{P}_{2}}3P2​ of the 208Pb isotope. The cases of resonance, i.e., the coincidence of the frequencies of the probe and control fields with the central frequencies of the corresponding quantum transitions, and quasi-resonance, when such a coincidence occurs only up to the line width of the corresponding quantum transition, have been considered. It has been shown that in these cases there is a tendency for the input probe radiation to split into pulses with different polarization characteristics. If the input probe radiation is weak enough, these pulses have constant polarization characteristics and are normal mode pulses. In the case of a higher power of the input probe radiation, the pulses into which it splits in the medium are not normal mode pulses, but their polarization characteristics fluctuate near the values inherent in normal modes. At the same time, the phase modulation of the probe field is present at all stages of its propagation in the medium. It has been shown that the transparency of the medium for the probe field decreases with increasing intensity of the input probe radiation. However, it is sufficiently large if the polarization characteristics of the input probe radiation coincide with those for the normal mode, the major axis of the polarization ellipse of which is parallel to the major axis of the control field polarization ellipse.
We report electromagnetically induced gain in a highly degenerate two-level rotational vibrational molecular system. Using two photon (Raman-type) interaction with right and left circularly polarized pump and probe waves, the Zeeman coherence is established within the manifold of degenerate sublevels belonging to a rotational vibrational eigenstate. We analytically and numerically calculate the third-order nonlinear optical susceptibility for a Doppler-broadened molecular transition for an arbitrary high rotational angular momentum $(J\ensuremath{\ge}20)$. It is shown that for a QQQ-type open transition, a weak probe will experience an electromagnetically induced gain in presence of a strong copropagating pump wave. The inversionless gain originates due to cancellation of absorption from the interference of the coupled $\ensuremath{\Lambda}$- and V-type excitation channels in an NNN-type configuration. A detailed analysis of the optical susceptibility as a function of Doppler detuning explains how the gain bands are generated in a narrow transparency window from the overlapping contributions of different velocity groups. It is shown that the orientation dependent coherent interaction in presence of a strong pump induces narrow resonances for the probe susceptibility. The locations, intensity, and sign (positive or negative susceptibility) of these resonances are decided by the frequency detuning of the Doppler group and the strength of the coupling field. The availability of high power tunable quantum cascade lasers covering a spectral region from about 4 to $12\text{ }\ensuremath{\mu}\text{m}$ opens up the possibility of investigating the molecular vibrational rotational transitions for a variety of coherent effects.
The dynamic Stark effect on the as Q (5,4) transition of the 0 → 1 vibrational band of the ν 2 mode of ammonia 15 NH 3 was studied by the method of copropagating waves of radiation of two 13 CO 2 lasers operating at the R (18) I line. For waves with mutually orthogonal polarizations, which propagated in a waveguide cell, the intensity of the saturating radiation reached 225 W/cm 2 , and the absorption line of the probing radiation had the form of a two-hump curve with a splitting that was consistent with the Rabi frequency for the ammonia transition being investigated. At the maximum intensity of the saturating radiation, complete transparency was observed at the center of the absorption line of 15 NH 3 . When identically polarized saturating and probing waves propagating in a cell at a small angle with respect to each other were used, the splitting was more weakly manifested. The effect of a spatial inhomogeneity of the optical fields on the shape of the line of saturated absorption is discussed.