We report experimental observation of electromagnetically induced transparency (EIT) in an inhomogeneously broadened V-type Na 2 molecular system. The experiment is performed with both co-and counter-propagating arrangements for the propagation direction of the coupling and probe laser beams. In our theoretical model we employ the density matrix formalism, as well as perturbative methods for obtaining the probe field absorption profile for both open and closed systems. Simulations of the experimental data show excellent agreement with the predictions derived from the basic theory. Our fluorescent intensity measurements show that in the copropagating configuration the EIT plus saturation window depth is about 95%, while under similar conditions in the counter-propagating geometry we observed 40-45% reduction in the fluorescence signal around line center. To separate the two simultaneously occurring mechanisms in a V-type system, namely EIT and saturation, that are induced by the coupling field, we have carried out theoretical calculations, which show that in the co-propagating case a significant fraction of the depth of the dip is due to the coherent effect of EIT. When the
We present experimentally derived potential curves and spin-orbit interaction functions for the strongly perturbed A 1 Σ + u and b 3 Πu states of the cesium dimer. The results are based on data from several sources. Laser-induced fluorescence Fourier transform spectroscopy (LIF FTS) was used some time ago in the Laboratoire Aimé Cotton primarily to study the X 1 Σ + g state. More recent work at Tsinghua University provides information from moderate resolution spectroscopy on the lowest levels of the b 3 Π ± 0u states as well as additional high resolution data. From Innsbruck University, we have precision data obtained with cold Cs2 molecules. Recent data from Temple University was obtained using the optical-optical double resonance polarization spectroscopy technique, and finally, a group at the University of Latvia has added additional LIF FTS data. In the Hamiltonian matrix, we have used analytic potentials (the Expanded Morse Oscillator form) with both finite-difference (FD) coupled-channels and discrete variable representation (DVR) calculations of the term values. Fitted diagonal and off-diagonal spin-orbit functions are obtained and compared with ab initio results from Temple and Moscow State universities.
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