Electromagnetically induces transparency in atomic vapor of calcium / Transparencia induzida eletromagneticamente em vapor atomico de calcio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

In this work we studied the phenomenon of electromagnetically induced trans-parency (EIT) in three level systems in the L, Vee and cascade configurations. In these systems, the transparency of a probe beam is induced by a strong coupling beam. A systematic comparison of the EIT signal width and the dispersion in the medium for the three systems for different relative values of wavelength of the two beams is presented for inhomogeneously Doppler-broadened medium. EIT dependence on the angle between the probe and coupling beams is also investigated. We observe that although the narrowest and deepest EIT signal, and the greatest slope of the dispersion curve are obtained for the L system, the V system is the more robust relative to the angle between the beams and to the relative wavelength of the beams. Finally, we present the results obtained in an experiment in a three level cascade system considering the levels 1S01 1P01 and 1D2 in Ca atoms. We describe, for the first time to our knowledge, the use of the optogalvanic detection technique for observing EIT. In this experiment we observed EIT in a Ca hollow cathode lamp with Kr buffer gas, obtaining up to 76% cancellation of absorption of a blue laser beam (423 nm) induced by a strong and counterpropagating yellow beam (586 nm). EIT in a cascade system considering a copropagating geometry of the laser beams was observed

ASSUNTO(S)

atomic vapor otica não-linear transparencia induzida eletromagneticamente vapor atomico electromagnetically induces transparency nonlinear optics

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