scholarly journals Chirped Laser Pulse Effect on a Quantum Linear Oscillator

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1293
Author(s):  
Valeriy A. Astapenko ◽  
Evgeniya V. Sakhno
Keyword(s):  
Laser Pulse ◽  
Field Strength ◽  
Ground State ◽  
Theoretical Study ◽  
Exact Expression ◽  
Pulse Action ◽  
Linear Oscillator ◽  
Analytical Formulas ◽  
Chirped Laser Pulse ◽  
Excitation Probability

We present a theoretical study of the excitation of a charged quantum linear oscillator by chirped laser pulse with the use of probability of the process throughout the pulse action. We focus on the case of the excitation of the oscillator from the ground state without relaxation. Calculations were made for an arbitrary value of the electric field strength by utilizing the exact expression for the excitation probability. The dependence of the excitation probability on the pulse parameters was analyzed both numerically and by using analytical formulas.

scholarly journals High sensitive label-free optical sensor based on Goos–Hänchen effect by the single chirped laser pulse

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Elnaz Rezaei Benam ◽  
Mostafa Sahrai ◽  
Jafar Poursamad Bonab
Keyword(s):  
Laser Pulse ◽  
Ground State ◽  
Laser Field ◽  
Molecular System ◽  
Biological Molecules ◽  
Label Free ◽  
Number Density ◽  
Vibrational Levels ◽  
Cavity Configuration ◽  
Chirped Laser Pulse

Abstract We consider a four-level molecular system with two ground-state vibrational levels and two excited-state vibrational levels inside a constant cavity configuration. We discuss the reflected and transmitted Goos–Hänchen (GH) shifts of a positive and negative single-chirped laser pulse. The impacts of the laser field detuning, intensity of applied laser field, and appropriately tuning the chirp rate on GH shifts are then analyzed. It is also found that this sensor is very sensitive to the refractive index of the intracavity medium, which can coherently be controlled by the medium parameters. The results show that such a sensor can be most effective for detecting biological molecules with low concentration than the large number density, where a bit variation in the concentration of sample will lead to a great variation on the GH shifts.

POLARON IN A QUANTUM DOT UNDER AN ELECTRIC FIELD

2007 ◽  
Vol 21 (24) ◽  
pp. 1635-1642
Author(s):  
MIAN LIU ◽  
WENDONG MA ◽  
ZIJUN LI
Keyword(s):  
Quantum Dot ◽  
Electric Field ◽  
Field Intensity ◽  
Ground State Energy ◽  
Ground State ◽  
Electric Field Intensity ◽  
State Energy ◽  
Theoretical Study ◽  
The Moment ◽  
Transformation Methods

We conducted a theoretical study on the properties of a polaron with electron-LO phonon strong-coupling in a cylindrical quantum dot under an electric field using linear combination operator and unitary transformation methods. The changing relations between the ground state energy of the polaron in the quantum dot and the electric field intensity, restricted intensity, and cylindrical height were derived. The numerical results show that the polar of the quantum dot is enlarged with increasing restricted intensity and decreasing cylindrical height, and with cylindrical height at 0 ~ 5 nm , the polar of the quantum dot is strongest. The ground state energy decreases with increasing electric field intensity, and at the moment of just adding electric field, quantum polarization is strongest.

Theoretical Study of the Fragmentation Pathways of Norbornane in Its Doubly Ionized Ground State

2007 ◽  
Vol 111 (42) ◽  
pp. 10834-10848 ◽  
Author(s):  
Stefan Knippenberg ◽  
Balázs Hajgató ◽  
Jean-Pierre François ◽  
Michael S. Deleuze
Keyword(s):  
Ground State ◽  
Theoretical Study ◽  
Fragmentation Pathways

Theoretical study of ground state and high-pressure phase of platinum carbide

2008 ◽  
Vol 69 (11) ◽  
pp. 2907-2910 ◽  
Author(s):  
M. Rabah ◽  
D. Rached ◽  
M. Ameri ◽  
R. Khenata ◽  
A. Zenati ◽  
...  
Keyword(s):  
High Pressure ◽  
Ground State ◽  
Theoretical Study ◽  
High Pressure Phase ◽  
Pressure Phase

Peculiarities of laser phase behavior associated with the accelerated electron in a chirped laser pulse

2014 ◽  
Vol 21 (5) ◽  
pp. 054503 ◽  
Author(s):  
Q. Song ◽  
X. Y. Wu ◽  
J. X. Wang ◽  
S. Kawata ◽  
P. X. Wang
Keyword(s):  
Laser Pulse ◽  
Phase Behavior ◽  
Chirped Laser Pulse

scholarly journals Терагерцовая спектроскопия магнитоэлектрика HoAl-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

2022 ◽  
Vol 130 (1) ◽  
pp. 59
Author(s):  
А.М. Кузьменко ◽  
В.Ю. Иванов ◽  
А.Ю. Тихановский ◽  
А.Г. Пименов ◽  
А.М. Шуваев ◽  
...  
Keyword(s):  
Crystal Field ◽  
Excited States ◽  
Ground State ◽  
Theoretical Study ◽  
Low Frequency ◽  
Local Symmetry ◽  
Matrix Elements ◽  
The Matrix ◽  
Excitation Conditions ◽  
Ground Multiplet

Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300 K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm–1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.

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