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Laser Physics

Theoretical study on the ultra-narrow bandwidth tunable atomic filter with electromagnetically induced transparency

Yang Liu, Shu-Qing Li, Zhong-Ying Feng, Xiao-Fei Liu, Jin-Yue Gao

Published Oct 27, 2016• 0 citations
Publisher

Abstract

Abstract To obtain the weak signal light detection from the high background noise, we present a theoretical study on the ultra-narrow bandwidth tunable atomic filter with electromagnetically induced transparency. In a three-level Λ -type atomic system in the rubidium D1 line, the bandwidth of the EIT atomic filter is narrowed to ~ 6.5 MHz . And the single peak transmission of the filter can be up to 86 % . Moreover, the transmission wavelength can be tuned by changing the coupling light frequency. This theoretical scheme can also be applied to other alkali atomic systems.

DOI
10.1088/1054-660x/26/12/125202

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Abstract To obtain the weak signal light detection from the high background noise, we present a theoretical study on the ultra-narrow bandwidth tunable atomic filter with electromagnetically induced transparency. In a three-level Λ -type atomic system in the rubidium D1 line, the bandwidth of the EIT atomic filter is narrowed to ~ 6.5 MHz . And the single peak transmission of the filter can be up to 86 % . Moreover, the transmission wavelength can be tuned by changing the coupling light frequency. This theoretical scheme can also be applied to other alkali atomic systems.
We report the experimental demonstration of an ultranarrow bandwidth atomic filter by optically induced polarization rotation in multilevel electromagnetically induced transparency systems in hot Rb vapor.With a coupling intensity of 2.3 W/cm 2 , the filter shows a peak transmission of 33.2% and a bandwidth of 10 MHz.By altering the coupling frequency, a broad tuning range of several Doppler linewidths of the D1 line transitions of 87 Rb atoms can be obtained.The presented atomic filter has useful features of ultranarrow bandwidth, and the operating frequency can be tuned resonance with the atomic transition.Such narrowband tunable atomic filter can be used as an efficient noise rejection tool in classical and quantum optical applications.
A Raman-amplified atomic filter is demonstrated experimentally. With a coupling light detuned from the D2 line of 85Rb, a weak signal light can be amplified by a factor of 55, and the bandwidth of the filter's transmission spectrum is narrowed to approximately 60 MHz. Moreover, the transmission wavelength is adjustable by changing the coupling-light frequency. Compared with a conventional dispersive atomic filter, this Raman-amplified atomic filter could be more efficient to suppress background noise in free-space quantum-key distribution or a laser-communication system.
We demonstrate a tunable narrowband filter based on optical-pumping-induced circular dichroism in rubidium vapor. The filter achieves a peak transmission of 14.6%, a linewidth of 80 MHz, and an out-of-band extinction of >or=35 dB. The transmission peak can be tuned within the range of the Doppler linewidth of the D1 line of atomic rubidium at 795 nm. While other atomic filters work at frequencies far from absorption, the presented technique provides light resonant with atomic media, useful for atom-photon interaction experiments. The technique could readily be extended to other alkali atoms.
Laser spectroscopy experiments are reported on rubidium atoms by using two or three external cavity diode lasers to study multiple resonance transitions in Λ- and V-type systems as well as on (Λ+V)-type system. Electromagnetically induced transparency (EIT) peaks having sub-natural line-widths are found on the Doppler broadened transmission backgrounds with velocity selective enhanced absorption dips. In the presence of a pump laser, probe spectrum shows enhancement of EIT signal by tuning the control laser frequency when the Λ- and V-type EIT signals are made to overlap. Theoretical analysis is carried out by solving the optical Bloch equations for five-level atomic model under Λ configuration. With the numerically simulated spectra, variation of EIT transmission peak with ground state decay rate and excited state spontaneous decay rate are investigated. Effect of pump Rabi frequency on the transmission peak is also shown.