Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Applied Optics

Theoretical model of an atomic line filter based on the combination of a double selective pump

Zhenyu Zhu, Hanyang Li, Weimin Sun, Shuangqiang Liu

Published Dec 21, 2016• 2 citations
Publisher

Abstract

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.

DOI
10.1364/ao.56.000078

Related papers

Incoherent pump assisted atomic filter based on laser-induced optical anisotropy

Shuangqiang Liu, Yundong Zhang

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.

Applied Optics•Oct 11, 2012•1 citation

Effect of selective saturated absorption on atomic line filter

Shuangqiang Liu, Weimin Sun

We report an atomic filter based on optical pumping induced anisotropy in Doppler-broadened two-level atoms. Atomic line filters (ALF) in previous research used a selective pump to populate atoms on special Zeeman sub-levels to obtain optical anisotropy because of dipole selection rules. Unlike them, we proposed a novel method to get circular anisotropy realized by selectively saturated absorption in rubidium.

International Conference on Optoelectronics and Microelectronics•Sep 1, 2013•0 citations

Atomic filter with large scale tunability

Shuangqiang Liu, Yundong Zhang, Hao Wu +1 more

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.

Journal of the Optical Society of America B•Apr 14, 2011•7 citations

Selective optical pumping process in Doppler-broadened atoms

Shuangqiang Liu, Yundong Zhang, Daikun Fan +2 more

By solving the optical Bloch equations with the rate-equation approximation, we calculate the time dependence of the magnetic sublevel populations of Doppler-broadened atoms. With an increase of the left-circularly polarized pump intensity, the population fraction of a certain sublevel of the excited state almost reaches 0.3, resulting in anisotropy in the excited state, which is important to the optical filter based on circular birefringence and dichroism. Furthermore, numerical results show that the real saturation pump intensity for the moving atoms is much larger than that for the resting atoms.

Applied Optics•Apr 7, 2011•7 citations

Study of the effect of repump laser on atomic line filter

Ayan Ray, Md. Sabir Ali, Alok Chakrabarti

The improvement in the performance of an atomic line filter (ALF) under the action of a repump laser is reported in the current experimental work. We address the issue of repumping by including an additional laser coupling the 5S1/2(F=1)→5P3/2(F′′=2,1,0) hyperfine levels whereas the optical filter action is exhibited through a pump–probe laser-induced excited state absorption {5S1/2(F=2)→5P3/2(F′=3)→5D3/2(F′′=3)} of the Rb87 atom. It is found that the application of the repump mechanism considerably influences the characterizing parameters (i.e., transmittance and width) of the ALF. To optimize the performance of the ALF, it is required to carefully choose the detuning and intensity of the repump laser for a fixed set of pump–probe combination. For this purpose, the effect of systematic change in detuning and intensity of the repump laser on the ALF signal is studied in detail. For example, it is experimentally found that ALF considerably benefits (∼30%) in transmittance from selective repumping of atoms. It is to be noted that, unlike earlier reports, where the frequency scale of the filter is calibrated with Faby–Perot etalons of comparatively larger free spectral range, the marking is done here with the help of double resonance optical pumping (DROP) signals. The DROP signals, which originate from two-photon coupling within the 5S→5P→5D hyperfine domain, also act as an indicator of the existing “Radiation Trapping” process in the cascade medium. The current study may help in improving the performance of narrow-bandwidth ALF, which is useful for free space optical communication systems and laser spectroscopy.

Journal of the Optical Society of America B•Aug 16, 2013•8 citations

Theoretical model for an atomic optical filter based on optical anisotropy

Zhusong He, Yundong Zhang, Hao Wu +2 more

We develop a three-level theoretical model for atomic optical filters based on optical anisotropy induced by the circularly polarized pump field. Calculative results are in good agreement with experimental results reported previously [Opt. Lett27, 500 (2002)]. The filtering characteristics such as the functions of pump intensity, pump detuning, and cell temperature are studied, respectively. The theoretical analysis presented here is expected to be useful in investigating atomic optical filters and polarization spectroscopy.

Journal of the Optical Society of America B•Aug 18, 2009•13 citations
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 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.
By solving the optical Bloch equations with the rate-equation approximation, we calculate the time dependence of the magnetic sublevel populations of Doppler-broadened atoms. With an increase of the left-circularly polarized pump intensity, the population fraction of a certain sublevel of the excited state almost reaches 0.3, resulting in anisotropy in the excited state, which is important to the optical filter based on circular birefringence and dichroism. Furthermore, numerical results show that the real saturation pump intensity for the moving atoms is much larger than that for the resting atoms.
The improvement in the performance of an atomic line filter (ALF) under the action of a repump laser is reported in the current experimental work. We address the issue of repumping by including an additional laser coupling the 5S1/2(F=1)→5P3/2(F′′=2,1,0) hyperfine levels whereas the optical filter action is exhibited through a pump–probe laser-induced excited state absorption {5S1/2(F=2)→5P3/2(F′=3)→5D3/2(F′′=3)} of the Rb87 atom. It is found that the application of the repump mechanism considerably influences the characterizing parameters (i.e., transmittance and width) of the ALF. To optimize the performance of the ALF, it is required to carefully choose the detuning and intensity of the repump laser for a fixed set of pump–probe combination. For this purpose, the effect of systematic change in detuning and intensity of the repump laser on the ALF signal is studied in detail. For example, it is experimentally found that ALF considerably benefits (∼30%) in transmittance from selective repumping of atoms. It is to be noted that, unlike earlier reports, where the frequency scale of the filter is calibrated with Faby–Perot etalons of comparatively larger free spectral range, the marking is done here with the help of double resonance optical pumping (DROP) signals. The DROP signals, which originate from two-photon coupling within the 5S→5P→5D hyperfine domain, also act as an indicator of the existing “Radiation Trapping” process in the cascade medium. The current study may help in improving the performance of narrow-bandwidth ALF, which is useful for free space optical communication systems and laser spectroscopy.
We develop a three-level theoretical model for atomic optical filters based on optical anisotropy induced by the circularly polarized pump field. Calculative results are in good agreement with experimental results reported previously [Opt. Lett27, 500 (2002)]. The filtering characteristics such as the functions of pump intensity, pump detuning, and cell temperature are studied, respectively. The theoretical analysis presented here is expected to be useful in investigating atomic optical filters and polarization spectroscopy.