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Sub-natural resonances due to ground state coherence in 6Li

Jean-Noël Fuchs, Gráinne Duffy, W J Rowlands, A. M. Akulshin

Published Apr 5, 2006• 0 citations
OpenAlex

Abstract

Abstract. We report sub-Doppler and sub-natural linewidth spectroscopy of 6Li on the D1 and D2 lines in both a vapour cell and an atomic beam. Electromagnetically induced transparency is created using co-propagating mutually coherent laser beams with a frequency difference equal to the hyperfine ground state splitting of 228.2 MHz. The effects of various optical polarization configurations and applied magnetic fields are investigated. In addition, we present an optical Ramsey spectroscopy technique which further reduces the observed resonance width.

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Two-frequency sub-Doppler spectroscopy of the caesium D1 line in various configurations of counterpropagating laser beams

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Peculiarities of electromagnetically induced transparency in Rb vapor due to Zeeman coherence in the same hyperfine level

A. M. Akulshin, S. Barreiro, A. Lezama

We have studied sub-natural-width resonances (SNWR) observed in the absorption and fluorescence of Rb vapor under excitation by two copropagating optical waves with variable frequency offset. The mutually coherent optical fields resonantly couple the same ground-state hyperfine level to an excited state. The sub-natural-width resonances present opposite signs depending on which ground-state hyperfine level (GSHL) participates in the interaction with the light. The influence of external magnetic field, polarization and intensity of applied optical fields on the sub-natural-width resonances is examined. The narrowest observed resonance has a width of 10 kHz (FWHM). It is shown that the SNWR obey the selection rules corresponding to two photon transitions starting and ending at Zeeman sublevels on the same GSHL. The application of the observed SNWRs to magnetometers based on the effect of coherent population trapping is considered.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 21, 1998•0 citations
Abstract. We report sub-Doppler and sub-natural linewidth spectroscopy of 6Li on the D1 and D2 lines in both a vapour cell and an atomic beam. Electromagnetically induced transparency is created using co-propagating mutually coherent laser beams with a frequency difference equal to the hyperfine ground state splitting of 228.2 MHz. The effects of various optical polarization configurations and applied magnetic fields are investigated. In addition, we present an optical Ramsey spectroscopy technique which further reduces the observed resonance width.
We report electromagnetically induced transparency for the D1 and D2 lines in 6^{6}6Li in both a vapour cell and an atomic beam. Electromagnetically induced transparency is created using co-propagating mutually coherent laser beams with a frequency difference equal to the hyperfine ground state splitting of 228.2 MHz. The effects of various optical polarization configurations and applied magnetic fields are investigated. In addition, we apply an optical Ramsey spectroscopy technique which further reduces the observed resonance width.
We present an experimental study of sub-natural width resonances in fluorescence from a collimated beam of 6Li atoms excited on the D1 and D2 lines by a bichromatic laser field. We show that in addition to ground-state Zeeman coherence, coherent population oscillations between ground and excited states contribute to the sub-natural resonances. High-contrast resonances of electromagnetically induced transparency and electromagnetically induced absorption due to both effects, i.e., ground-state Zeeman coherence and coherent population oscillations, are observed.
Sub-Doppler resonances in caesium vapours are studied in a laser field produced by counterpropagating two-frequency light beams with mutually orthogonal linear polarisations. The beams are in resonance with optical transitions in the D1 line, the frequency difference of the field spectral components being equal to the hyperfine ground-state splitting in the Cs atom (≈9.2 GHz). It has already been shown that in this configuration, the hypercontrast effect can be observed for sub-Doppler resonances, which makes this configuration promising for the employment in newgeneration miniature optical frequency standards. In the present work, two different two-frequency configurations are compared with each other and with the single-frequency configuration widely used in practice for observing saturated absorption resonances. The parameters of nonlinear resonances are measured at various temperatures of caesium vapours and at different optical field intensities. The results of the investigations performed make it possible to find an optimal two-frequency scheme for exciting nonlinear resonances and to estimate a potential of the scheme for its applications in quantum metrology.
We report on an investigation of electromagnetically induced transparency (EIT) in sodium vapour. In our experiment, sodium atoms are excited on the D1-line with laser radiation containing two components with a frequency difference close to that of the two hyperfine ground states of sodium (1.772 GHz). Such an excitation leads to coherent trapping of atomic population in “dark” superpositional states, which dramatically reduces the absorption of light. A frequency transparency window is measured to have a subnatural width, which is a clear indication of coherent population trapping. Dependence of EIT on laser frequencies and intensities, on the magnetic field strength as well as on the temperature of the sodium vapour is studied.
Abstract Sub-Doppler resonances in caesium vapours are studied in a laser field produced by counterpropagating two-frequency light beams with mutually orthogonal linear polarisations. The beams are in resonance with optical transitions in the D1 line, the frequency difference of the field spectral components being equal to the hyperfine ground-state splitting in the Cs atom (∼9.2 GHz). It has already been shown that in this configuration, the hypercontrast effect can be observed for sub-Doppler resonances, which makes this configuration promising for the employment in new-generation miniature optical frequency standards. In the present work, two different two-frequency configurations are compared with each other and with the single-frequency configuration widely used in practice for observing saturated absorption resonances. The parameters of nonlinear resonances are measured at various temperatures of caesium vapours and at different optical field intensities. The results of the investigations performed make it possible to find an optimal two-frequency scheme for exciting nonlinear resonances and to estimate a potential of the scheme for its applications in quantum metrology.
We have studied sub-natural-width resonances (SNWR) observed in the absorption and fluorescence of Rb vapor under excitation by two copropagating optical waves with variable frequency offset. The mutually coherent optical fields resonantly couple the same ground-state hyperfine level to an excited state. The sub-natural-width resonances present opposite signs depending on which ground-state hyperfine level (GSHL) participates in the interaction with the light. The influence of external magnetic field, polarization and intensity of applied optical fields on the sub-natural-width resonances is examined. The narrowest observed resonance has a width of 10 kHz (FWHM). It is shown that the SNWR obey the selection rules corresponding to two photon transitions starting and ending at Zeeman sublevels on the same GSHL. The application of the observed SNWRs to magnetometers based on the effect of coherent population trapping is considered.