Population transfer through multiple channels in two harmonic laser pulses

2020 ◽  
Vol 19 (05) ◽  
pp. 2050023
Author(s):  
Rong Wang ◽  
Ying-Yu Niu
Keyword(s):  
Relative Phase ◽  
Transition Probability ◽  
Laser Pulses ◽  
Target Population ◽  
Population Transfer ◽  
Population Distributions ◽  
Final Population ◽  
Target States ◽  
Transition Scheme ◽  
Mixed Transition

The processes of population transfer in the ground electronic state of HCl molecule through the three transition schemes are investigated by numerically solving the time-dependent Schrödinger equation. Two harmonic pulses are employed to induce population transfer and the relative phase of the two pulses can control the final population distributions. In the ladder transition scheme, the variation range of the target population with the relative phase is nearly 100% which is larger than that in the multi-photon transition scheme. It is more efficient for the mixed transition scheme to control population transfer between the initial and target states by using the relative phase. Comparing with the multi-photon and ladder schemes, the transition probability of the target population is more sensitive to the two pulse amplitudes in the mixed transition scheme.

Coherent phase control of population transfer through ladder system in two laser pulses with ω and nω

2016 ◽  
Vol 15 (06) ◽  
pp. 1650053 ◽  
Author(s):  
Ying-Yu Niu ◽  
Rong Wang ◽  
Ming-Hui Qiu ◽  
Jun-Ling Xiu
Keyword(s):  
Relative Phase ◽  
Population Distribution ◽  
Laser Pulses ◽  
Time Dependent ◽  
Population Transfer ◽  
Average Amplitude ◽  
Ladder System ◽  
Population Distributions ◽  
Quantum Wave ◽  
Target States

The ladder transitions controlled by two harmonic pulses are investigated theoretically using a time-dependent quantum wave packet method for the ground electronic state of HF molecule. By choosing [Formula: see text], [Formula: see text] and [Formula: see text] schemes, the population can be transferred to target states [Formula: see text]. The population distribution can be controlled by the average amplitude of total electric field which depends on the relative phase of two pulses. With the variation of the relative phase between [Formula: see text] and [Formula: see text] pulses, the variation of population has a period of [Formula: see text]. For [Formula: see text] and [Formula: see text] schemes, the population distributions show oscillation behavior with a period of [Formula: see text] by varying the relative phase. The two harmonic pulses can realize a nearly complete population transfer to the target state.

scholarly journals Dynamics of the Creation of a Rotating Bose–Einstein Condensation by Two Photon Raman Transition Using a Laguerre–Gaussian Laser Pulse

Atoms ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
Koushik Mukherjee ◽  
Soumik Bandyopadhyay ◽  
Dilip Angom ◽  
Andrew M. Martin ◽  
Sonjoy Majumder
Keyword(s):  
Interaction Strength ◽  
Transition Process ◽  
Laser Pulses ◽  
Harmonic Trap ◽  
Einstein Condensation ◽  
Raman Transition ◽  
Two Photon ◽  
Final Population ◽  
The Creation ◽  
Bose Einstein

We present numerical simulations to unravel the dynamics associated with the creation of a vortex in a Bose–Einstein condensate (BEC), from another nonrotating BEC using two-photon Raman transition with Gaussian (G) and Laguerre–Gaussian (LG) laser pulses. In particular, we consider BEC of Rb atoms at their hyperfine ground states confined in a quasi two dimensional harmonic trap. Optical dipole potentials created by G and LG laser pulses modify the harmonic trap in such a way that density patterns of the condensates during the Raman transition process depend on the sign of the generated vortex. We investigate the role played by the Raman coupling parameter manifested through dimensionless peak Rabi frequency and intercomponent interaction on the dynamics during the population transfer process and on the final population of the rotating condensate. During the Raman transition process, the two BECs tend to have larger overlap with each other for stronger intercomponent interaction strength.

scholarly journals Information Geometric Perspective on Off-Resonance Effects in Driven Two-Level Quantum Systems

2020 ◽  
Vol 2 (1) ◽  
pp. 166-188 ◽  
Author(s):  
Carlo Cafaro ◽  
Steven Gassner ◽  
Paul M. Alsing
Keyword(s):  
Resonance Condition ◽  
Transition Probability ◽  
Geometric Analysis ◽  
Quantum Systems ◽  
Time Dependent ◽  
Population Transfer ◽  
Resonance Effects ◽  
Hamiltonian Models ◽  
Exactly Solvable ◽  
Geodesic Paths

We present an information geometric analysis of off-resonance effects on classes of exactly solvable generalized semi-classical Rabi systems. Specifically, we consider population transfer performed by four distinct off-resonant driving schemes specified by su 2 ; ℂ time-dependent Hamiltonian models. For each scheme, we study the consequences of a departure from the on-resonance condition in terms of both geodesic paths and geodesic speeds on the corresponding manifold of transition probability vectors. In particular, we analyze the robustness of each driving scheme against off-resonance effects. Moreover, we report on a possible tradeoff between speed and robustness in the driving schemes being investigated. Finally, we discuss the emergence of a different relative ranking in terms of performance among the various driving schemes when transitioning from on-resonant to off-resonant scenarios.

Rovibrational population transfer in the ground state controlled by two coherent laser pulses

2015 ◽  
Vol 91 (1) ◽  
Author(s):  
Rong Wang ◽  
Ying-Yu Niu ◽  
Ming-Hui Qiu ◽  
Yong-Chang Han
Keyword(s):  
Ground State ◽  
Laser Pulses ◽  
Population Transfer

Coherent population transfer in Rb atoms by frequency-chirped laser pulses

2003 ◽  
Vol 68 (5) ◽  
Author(s):  
G. P. Djotyan ◽  
J. S. Bakos ◽  
G. Demeter ◽  
P. N. Ignácz ◽  
M. Á. Kedves ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Population Transfer

Steering population transfer via continuum structure of the Li2 molecule with ultrashort laser pulses

2008 ◽  
Vol 348 (1-3) ◽  
pp. 39-44 ◽  
Author(s):  
Tian-Min Yan ◽  
Yong-Chang Han ◽  
Kai-Jun Yuan ◽  
Shu-Lin Cong
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Population Transfer ◽  
Continuum Structure ◽  
Ultrashort Laser

Ultrafast coherent population transfer driven by two few-cycle laser pulses

2010 ◽  
Vol 57 (2) ◽  
pp. 253-258 ◽  
Author(s):  
X. H. Yang ◽  
Z. H. Zhang ◽  
Z. Wang ◽  
X. N. Yan
Keyword(s):  
Laser Pulses ◽  
Population Transfer

Superposition of nuclear states in multi-lambda systems using x-ray laser pulses

2021 ◽  
Author(s):  
Nasim Mansourzadeh-Ashkani ◽  
Maghsoud Saadati-Niari ◽  
Farhad Zolfagharpour ◽  
Bashir Nedaee-Shakarab
Keyword(s):  
Excited States ◽  
Gamma Rays ◽  
Numerical Study ◽  
Ground States ◽  
Laser Pulses ◽  
Population Transfer ◽  
Adiabatic Passage ◽  
X Ray ◽  
Ideal Situation ◽  
The Ideal

Abstract Nuclear-state population transfer in the multi-lambda systems with N = 5 that interact with four X-ray laser pulses are investigated theoretically. By using the coincident pulses and stimulated Raman adiabatic passage (STIRAP) techniques, the population transfer from one initially populated ground state to an arbitrary coherent superposition of other ground states. Since the frequency of currently available X-ray lasers is lower than the gamma rays, in this method, X-ray laser pulses with different frequencies are interacting with the accelerated nuclei. We employ the Morris-Shore (MS) transformation to reduce the five-states system to two separate three-state and two-state linkage. The required laser intensities were calculated, which satisfy the conditions of coincident pulses and multi-lambda STIRAP techniques. Considering the spontaneous emission from excited states, the master equation has to be used for numerical study, and it is shown that an arbitrary superposition of final ground states can be obtained. Also, it is observed that by increasing the number of coincident pulses, the population of ground states gets closer to the ideal situation.

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