Coherent control of excited state populations in rubidium using Rabi oscillations

Abstract

Complete population inversion is demonstrated analytically in the strong field limit in a three level system using the rubidium 5s-5p-5d transition. We exploit the pre-transients of an amplitude shaped laser pulse to direct the dynamics of the Rabi oscillations such that the population transfer to the excited state can be controlled in a wide range from a strongly enhanced to vanishing one. The excitation is performed under off-resonant conditions. During the intense ultrafast pulse levels shift to such an extent that two-photon resonant excitation becomes possible, even though a frequency spectrum does not contain photons with energies necessary for excitation of an unperturbed system. Within the reach of experimental parameters we demonstrate 70% population transfer.

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

“…We verified that the origin of the perturbations comes from the fact that the emissions in the two paths partially overlap. From figure 9 for a different temporal interval t D c ), which is also obtained in our system, is of different origin compared to the usual CPT methods in the literature (see for example [12][13][14]). In these works, theenhancement of the population transfer in rubidium (Rb) [12] and the population transfer efficiency via constructive or destructive interferencebetween sequential transitions [13]were obtained in three-level systems.…”

“…From figure 9 for a different temporal interval t D c ), which is also obtained in our system, is of different origin compared to the usual CPT methods in the literature (see for example [12][13][14]). In these works, theenhancement of the population transfer in rubidium (Rb) [12] and the population transfer efficiency via constructive or destructive interferencebetween sequential transitions [13]were obtained in three-level systems. The main difference fromthe latter studies was the absence of interacting multi-path emissions and the effect of saturation.…”

“…It is noted that in this work,as well as previous work [5,7,8], our study differentiates itself from previous works in the field [1][2][3][10][11][12][13][14][15][16][17][18][19][20][21] for the following reasons: (i) anodipole forbidden transition isinvolved in the four-level system and (ii) the pump laser is the source for the emitted fields, ensuring that the wave mixing of the involved frequencies is the dominant process in the system.…”

Tracking coherent population transfer and thermal population relaxation in condensed system by broad-band transient grating spectroscopy

“…Much theoretical and experimental research on CPT has been carried out in recent decades [2][3][4][5]. Among those studies, the most remarkable is stimulated Raman adiabatic passage (STIRAP), which originated from Gaubatz [6,7] and coworker's primary work and was extended by Vitanov et al [1,8,9] The quantity S D represents the corresponding single-photon detuning.…”

Ultrafast coherent population transfer in two- and three-level quantum systems using sub-cycle and single-cycle pulses

“…The interaction of coherent optical pulses with quantum systems is related to many important applications [1][2][3][4][5]. Nowadays, with the development of laser technology, laser systems can produce controlled, intense, ultra-short optical pulses [6][7][8][9][10][11][12][13][14].…”