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Neimenggu Shi-da xuebao. Zhexue shehui kexue hanwen ban

Coherent Control of Autler-Townes Doublet of the Photoelectron Spectra of K Atom at 4p State

Yu Ding

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

Population of the 4p state of K atom was studied theoretically by means of dressed states theory when a sequence of two laser pulses is used to excite K atom from the 4s to the 4p state.Relationships of the population of the dressed states and area of the first pulse and delay time between two pulses were obtained.Then the relationship between Autler-Townes doublet and the delay time was investigated by using the formula attained.It is shown that Autler-Townes doublet of the 4p state can be controlled by the delay time between the two pulses selecting the population of the dressed state,because of the delay time and the area of the first pulse which has a fixed value equal to 0.5π.

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Population of the 4p state of K atom was studied theoretically by means of dressed states theory when a sequence of two laser pulses is used to excite K atom from the 4s to the 4p state.Relationships of the population of the dressed states and area of the first pulse and delay time between two pulses were obtained.Then the relationship between Autler-Townes doublet and the delay time was investigated by using the formula attained.It is shown that Autler-Townes doublet of the 4p state can be controlled by the delay time between the two pulses selecting the population of the dressed state,because of the delay time and the area of the first pulse which has a fixed value equal to 0.5π.
Coherent control beyond population control and spectral interferences is demonstrated on the interferences and intensity of the two Autler-Townes (AT) components in the photoelectron spectrum of K atoms, using a sequence of two intense time-delayed femtosecond laser pulses. Photoelectron spectra were taken at various delay times between the two laser pulses and at different laser intensities at a fixed delay time. With respect to the interferences in the AT doublet the role of time delay and laser intensity is interchangeable for $(n+0.5)\ensuremath{\pi}$ excitation. Strong laser fields or the optical phase of the delayed laser pulse allow the quantum mechanical phase of an atomic state to be manipulated in a symmetrical fashion. The observations are discussed in terms of a two-level model coupled to the continuum. For suitable combinations of the laser intensity of the first pulse and the time delay, the second laser pulse leaves the excited state population unchanged.
The properties of the photoelectron spectra in two resonant multi-photon ionization process are studied by means of dressed state theory and perturbation theory.The influences on the photoelectron spectra by the area of the first pulse and the delay between two pulses are discussed under strong-field scheme.It is shown that the photoelectron spectra can be modulated by the areas of the two pulses and the delay between them.Control of Autler-Townes doublet and the interferences in doublet can be realized by the area of the first pulse and the delay between the two pulses.The selective population of dressed states(SPODS)also can be realized by this coherent quantum mechanism.The population of dressed states cannot be selected by the area of the second pulse,but obviously it can be modulated.
Abstract We investigated the Autler–Townes splitting in photoelectron spectra of molecules steered by ultrashort laser pulses using the time-dependent wave-packet method. Structure of the Autler–Townes splitting was presented to analyze the information of a selective population of the dressed states. It was found that population transfer process, structure of photoelectron spectrum and pattern of Autler–Townes splitting can be controlled by adjusting the intensity, wavelength and delay time of laser pulses.
We theoretically investigate the resonant two-photon ionization of a hydrogen atom in the counter-rotating circularly polarized double-pulse sequences, by solving the time-dependent Schr\"odinger equation. Due to the induced Rabi oscillations between the ground and excited states, the well-known Autler-Townes doublet is observed in the photoelectron spectra. More interestingly, our numerical results reveal an additional peak located between the Autler-Townes doublets, which originates from single-photon ionization from the excited state by the second pulse. By adjusting the laser intensity of the two pulses, the photoelectron yields of the three peaks can be sensitively modulated, under the control of completed Rabi cycles within the first pulse. In addition, our results show a potential of manipulating the photoemission anisotropy by both the laser intensity and the two-pulse time delay, through adjusting the competition of different partial waves generated by the two pulses.
We study the dynamics of potassium atoms in intense laser fields using femtosecond phase-locked pulse pairs in order to extract physical mechanisms of strong field quantum control. The structure of the Autler–Townes (AT) doublet in the photoelectron spectra is measured to analyse transient processes. The analysis shows that the physical mechanism is based on the selective population of dressed states (SPODS). Experimental results of closed loop optimization of SPODS are presented in addition. Applications to decoherence measurements with implications for quantum information are also proposed.
The delay time dependence of photoelectron spectra and state populations of three-level ladder K 2 molecule is investigated by pump-probe pulses via time-dependent wave packet approach. The periodical motion of the wave packet with oscillating period 500 fs results in the periodical variation of photoelectron spectra. The photoelectron spectra show Autler-Townes double splitting at zero delay time, and no splitting at positive delay time. The periodical change of state populations with delay time can be ascribed to the coupling effect between the two pulses. It is found that the selectivity of the state populations may be attained by regulating the delay time. The results can provide some important basis for realizing the optical control of molecules experimentally.