Detuning-induced stimulated Raman adiabatic passage in dense two-level systems

Abstract

We investigate the coherence generation in dense two-level systems under detuning-induced stimulated Raman adiabatic passage (D-STIRAP). In the dense two-level system, the near dipole–dipole (NDD) interaction should be taken into consideration. With the increase in the strength of the NDD interaction, it is found that a switchlike transition of the generated coherence from maximum value to zero appears. Meanwhile, the adiabatic condition of the D-STIRAP is destroyed in the presence of the NDD interaction. In order to avoid the sudden decrease in the generated coherence and maintain the maximum value, we can use stronger detuning pulse or pump pulse, between which increasing the intensity of the detuning pulse is of more efficiency. Except for taking advantage of such maximum coherence in the high density case into areas like enhancing the four-wave mixing process, we also point out that the phenomenon of the coherence transition can be applied as an optical switch.

Keywords:

• Stimulated Raman adiabatic passage
• two-level systems
• near dipole–dipole interaction
• coherence transition

Notes

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 11504108], [grant number 11774089], [grant number 11474092], [grant number 11674094]; the Shanghai Municipal Natural Science Foundation [grant number 14ZR1410300]; the Fundamental Research Funds for the Central Universities [grant number 22A201514033].