Influence of Doppler effect on the phenomenon of electromagnetically induced transparency

Electromagnetically induced transparency (EIT) is a significant nonlinear optical phenomenon. Based on the theory of density matrix equation, we presented the influence of Doppler effect on EIT. A cascade type three-level system and Na atomic vapor is adopted during the course. The results showed that EIT is determined by Rabi frequency of the couple and probing field. It is independent of temperature usually. But when we take Doppler effect into account, it is found that the full transparency appeared at the condition of ΩP=0.01GHz, ΩC=1GHz will vary with temperature. An obvious transparent window can be observed only when the temperature is less than 50K. With the increase of temperature, EIT phenomenon disappeared quickly. At room temperature, we can see that the double peaks of Aulter-Townes will instead of the EIT transparent window as Rabi frequency of the couple field is larger than 1.5GHz.

[1]  Jiahua Li,et al.  Dynamic control of light propagation and optical switching through an RF-driven cascade-type atomic medium , 2009 .

[2]  Zhiqiang Zeng,et al.  Transient properties in a resonant ladder-type atomic system with vacuum-induced coherence and incoherent pumping , 2013 .

[3]  M S Shahriar,et al.  Observation of ultraslow and stored light pulses in a solid. , 2001, Physical review letters.

[4]  H. Jafarzadeh,et al.  Transient absorption–dispersion properties of four-level atomic system via elliptically polarized probe light and magnetic field , 2014 .

[5]  D. Matsukevich,et al.  Storage and retrieval of single photons transmitted between remote quantum memories , 2005, Nature.

[6]  K. Abbasian,et al.  Amplification without inversion in Y-type four-level scheme , 2012 .

[7]  Scully,et al.  Enhancement of the index of refraction via quantum coherence. , 1991, Physical review letters.

[8]  Yi-dong Jin,et al.  Electromagnetically induced transparency and ultra-narrow absorption in a ladder-type three-level atomic system , 2015 .

[9]  S. Harris,et al.  Light speed reduction to 17 metres per second in an ultracold atomic gas , 1999, Nature.

[10]  F. Bretenaker,et al.  Analysis of electromagnetically induced transparency and slow light in a hot vapor of atoms undergoing collisions , 2009, 0901.3790.

[11]  Chin-Chun Tsai,et al.  Ladder-type electromagnetically induced transparency with optical pumping effect , 2013 .

[12]  M. Lukin,et al.  Electromagnetically induced transparency with tunable single-photon pulses , 2005, Nature.