Gaussian and sinc-shaped few-cycle-pulse-driven ultrafast coherent population transfer inΛ-like atomic systems

Abstract

We report and propose a simple scheme to achieve efficient and fast coherent population transfer by utilizing either a nonlinearly chirped Gaussian-shaped few-cycle laser pulse or an unchirped sinc-shaped few-cycle laser pulse. The proposed scheme is shown to be fairly robust against the variation of the laser parameters such as temporal pulse width, chirp rates, carrier-envelope phases, and Rabi frequencies. We find that compared to the so-called stimulated Raman adiabatic passage technique, our scheme for complete population transfer with few-cycle Gaussian-shaped laser pulses requires less pulse area.

Simultaneous control of optical dipole force and coherence creation by super-Gaussian femtosecond pulses inΛ-like atomic systems

“…2(b) and 3(b). The chosen nonlinear chirp provides the robustness in the population transfer against the variation of pulse parameters [42]. The population dynamics may depend on the initial state preparation.…”

Few-cycle excitation of atomic coherence: A closed-form analytical solution beyond the rotating-wave approximation

“…In this way, we can define a sequence of approximations to (5). Specifically, if the kth-order approximation f k is found, then the (k +1)th-order approximation f k+1 is the solution of f that meets the condition (…”

“…Quantum coherent control (QCC) is of great importance in fundamental physics as well as a breadth of emerging applications [1]. With the advent of femtosecond and attosecond light sources, control of atomic coherence using ultrafast laser pulses with few optical cycles has attracted growing interest in recent years [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Apart from its significance in quantum theories, ultrafast QCC has profound implications in practical applications.…”

Non-Abelian holonomic transformation in the presence of classical noise

“…The shape and duration of the input laser field are determined by the envelop function Ω, whereas the carrier-envelop phases of the two driving lasers are described by θ and φ. Physically the amplitude and the phases can be tuned by certain combinations of acousto-optical modulators and phase-modulation locking achieved with low driving voltages, respectively. Recently, techniques to separately modulate the amplitude and phases of laser sources have been proposed and experimentally demonstrated [41][42][43][44]. In the following, we assume that only one control parameter admits significant fluctuations in each case and the fluctuations are of Gaussian type.…”