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Journal of the Optical Society of America B

Atomic filter with large scale tunability

Shuangqiang Liu, Yundong Zhang, Hao Wu, Ping Yuan

Published Apr 14, 2011• 7 citations
Publisher

Abstract

We propose an atomic filter configuration with large tunability based on selective optical-pumping-induced anisotropy. Theoretical simulation shows that the filter structure, by using a counterpropagating pump, can achieve higher transmission and a narrower passband than that using a copropagating pump due to the elimination of Doppler broadening. In addition, the filter’s tunability over 100 GHz via Aulter–Townes splitting and filtering characteristics is analyzed.

DOI
10.1364/josab.28.001100

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We propose an atomic filter configuration with large tunability based on selective optical-pumping-induced anisotropy. Theoretical simulation shows that the filter structure, by using a counterpropagating pump, can achieve higher transmission and a narrower passband than that using a copropagating pump due to the elimination of Doppler broadening. In addition, the filter’s tunability over 100 GHz via Aulter–Townes splitting and filtering characteristics is analyzed.
We demonstrate what is to our knowledge the first atomic optical filter that uses velocity selection to achieve a passband width that is less than the Doppler width of the filtering transition. A narrow-linewidth pump laser is used to induce circular birefringence in a narrow velocity class of atoms in a dense potassium vapor for 694-nm light resonant with the 4P(3/2)-6S(1/2) transition. The filter displays a single 170-MHz passband at a peak transmittance of 9.5%. The bandwidth is an order of magnitude lower than that of previously demonstrated atomic optical filters.
We present a model of an atomic filter based on laser-induced optical anisotropy that is achieved by the combination of a double selective pump. Most of these kinds of atomic optical filters reported previously adopt only one pump to make the atoms populate on particular sublevels. In this paper, another pump is added to the filter system to make sure all the atoms are in the pump–probe cycle. The feasibility of the re-pump is analyzed by employing the rate equation, and the contribution of the re-pump to the filter is discussed under various conditions. Simulation results show that the re-pump can not only enhance the transmission of the filter, but also vary the transmission spectrum peak wavelength.
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.
We describe the effects of incoherent pump on an atomic filter based on laser-induced optical anisotropy in a three-level ladder system interacting with a strong pump polarized circularly and a weak probe polarized linearly. According to the analysis of the numerical simulation results with some comparison, at the same time of eliminating noise, the filter can enhance the probe's transmission or even the probe gain can be achieved without population inversion. Moreover, the incoherent pumping rate and the cell temperature performance are evaluated and measures are taken to improve the filter's transmission and tunability by selecting proper parameters.