Emissions enhancement in a pump–coupling V-type coherently controlled four-level atomic system

Dynamic emission and population control in a Λ-type excitation scheme of atomic potassium

“…Briefly, in [8] a parametric amplification was recorded mostly in the counter-intuitive sequence of the coupling field with respect to the pump. In the latter study [9] it was concluded, among other things, that theoptimum excitation scheme of the driving pulses would be able to further manipulate the delayed path dynamics of the four-level system of potassium vapour, in an effort to control the channelling of the pump energy into the atomic channels,producingpromising results.…”

“…The interaction of potassium atoms with laser pulses has beenemployed to enhance the nonlinearities of a multi-level system [6], and thus the intensity of the internally generated emissions. In a typical four-level [4,5,7,9] configuration, the values of the critical parameters, such as thelaser peak intensity and atomic density, determined the system response. It was found that the nonlinearity c ( ) 3 depends on the increase of the above parameters [4,5].…”

“…Further investigation of the potential temporal control of the internally generated emissions, using two external laser fields [8,9] instead of a single pump [4,5,7], was considered to be areasonable extension of the earlier studies. In [8,9],two optical fields, with wavelengths at 728.6 nm and 404.5 nm, excited a four-level atomic system, (V-type configuration), andpronounced enhancement of the radiations of interest was observed. In [8], ∼100 fs duration pulses (pumpcoupling fields) were used, in high densities ~-( ) 10 cm 16 3 of atomic potassium.…”

“…In [8], ∼100 fs duration pulses (pumpcoupling fields) were used, in high densities ~-( ) 10 cm 16 3 of atomic potassium. Also, in [9], ns duration pulses (pumpcoupling fields) drove a potassium system for low densities ~-( ) 10 cm 14 3 and an average propagation length (5 cm). Briefly, in [8] a parametric amplification was recorded mostly in the counter-intuitive sequence of the coupling field with respect to the pump.…”

“…In this work, the resonant pump laser I , max with the wavelength l = 728.58 nm, c [9], where the second laser insignificantly affects the populations of the involved states. In the present Λ-type excitation scheme, we restrict our study on the emission dynamics of the delayed atomic path-2…”