M. Tanasittikosol

Publications (6)4.18 Total impact

• Article: Sidebands shifts and induced sidebands in rf-dressed Rydberg systems

  M. Tanasittikosol, R. M. Potvliege
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  ABSTRACT: The effect of an ac modulation on a 2-level or 3-level system is studied theoretically. The absorption spectrum is calculated by solving the optical Bloch equations and is interpreted by reference to the Floquet quasienergy spectrum. The dependence of the absorption sidebands on the intensity of the coupling laser field in Rydberg systems submitted to a radio-frequency (rf) field is analysed in detail. It is shown that for sufficiently strong coupling fields additional sidebands appear in the probe absorption spectrum in ladder 3-level systems. These additional sidebands are induced by the coupling of the intermediate state to the Floquet manifold spawned by the upper state under rf modulation.
  06/2012;
• Article: Subnatural linewidths in two-photon excited-state spectroscopy

  M. Tanasittikosol, C. Carr, C. S. Adams, K. J. Weatherill
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  ABSTRACT: We investigate, theoretically and experimentally, absorption on an excited-state atomic transition in a thermal vapor where the lower state is coherently pumped. We find that the transition linewidth can be subnatural, that is, less than the combined linewidth of the lower and upper state. For the specific case of the 6P3/2→7S1/2 transition in room temperature cesium vapor, we measure a minimum linewidth of 6.6 MHz compared with the natural width of 8.5 MHz. Using perturbation techniques, an expression for the complex susceptibility is obtained which provides excellent agreement with the measured spectra.
  Phys. Rev. A. 03/2012; 85(3).
• Source

  Available from: Christopher Carr

  Article: Sub-natural linewidths in excited-state spectroscopy

  M. Tanasittikosol, C. Carr, C. S. Adams, K. J. Weatherill
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  ABSTRACT: We investigate, theoretically and experimentally, absorption on an excited-state atomic transition in a thermal vapor where the lower state is coherently pumped. We find that the transition linewidth can be sub-natural, i.e. less than the combined linewidth of the lower and upper state. For the specific case of the 6P_{3/2} -> 7S_{1/2} transition in room temperature cesium vapor, we measure a minimum linewidth of 6.6 MHz compared with the natural width of 8.5 MHz. Using perturbation techniques, an expression for the complex susceptibility is obtained which provides excellent agreement with the measured spectra.
  02/2012;
• Source

  Available from: Kevin Weatherill

  Article: Microwave dressing of Rydberg dark states

  M. Tanasittikosol, J. D. Pritchard, D. Maxwell, A. Gauguet, K. J. Weatherill, R. M. Potvliege, C. S. Adams
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  ABSTRACT: We study electromagnetically induced transparency (EIT) in the 5s$\rightarrow$5p$\rightarrow$46s ladder system of a cold $^{87}$Rb gas. We show that the resonant microwave coupling between the 46s and 45p states leads to an Autler-Townes splitting of the EIT resonance. This splitting can be employed to vary the group index by $\pm 10^5$ allowing independent control of the propagation of dark state polaritons. We also demonstrate that microwave dressing leads to enhanced interaction effects. In particular, we present evidence for a $1/R^3$ energy shift between Rydberg states resonantly coupled by the microwave field and the ensuing breakdown of the pair-wise interaction approximation.
  02/2011;
• Source

  Available from: Armen Sargsyan

  Article: Enhanced electric field sensitivity of rf-dressed Rydberg dark states

  M.G.Bason, M Tanasittikosol, A Sargsyan, A K Mohapatra, D Sarkisyan, R M Potvliege, C S Adams
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  ABSTRACT: Optical detection of Rydberg states using electromagnetically induced transparency (EIT) enables continuous measurement of electric fields in a confined geometry. In this paper, we demonstrate the formation of radio frequency (rf)-dressed EIT resonances in a thermal Rb vapour and show that such states exhibit enhanced sensitivity to dc electric fields compared to their bare counterparts. Fitting the corresponding EIT profile enables precise measurements of the dc field independent of laser frequency fluctuations. Our results suggest that space charges within the enclosed cell reduce electric field inhomogeneities within the interaction region.
  New Journal of Physics 01/2010; · 4.18 Impact Factor
• Source

  Available from: Mark George Bason

  Article: Enhanced electric field sensitivity of rf-dressed Rydberg dark states

  M. G. Bason, M. Tanasittikosol, A. Sargsyan, A. K. Mohapatra, D. Sarkisyan, R. M. Potvliege, C. S. Adams
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  ABSTRACT: The formation of rf-dressed Rydberg dark states in thermal Rb vapour is demonstrated. It is shown that such states exhibit enhanced sensitivity to dc electric fields compared to their bare counterparts and enable precise measurement of the dc field independent of laser frequency fluctuations. Comment: 10 pages, 5 figures
  06/2009;