scholarly journals Нелинейное просветление InAs нитевидных нанокристаллов в видимом диапазоне

2020 ◽  
Vol 128 (1) ◽  
pp. 128
Author(s):  
А.С. Кулагина ◽  
А.И. Хребтов ◽  
А.А. Рыжов ◽  
В.В. Данилов ◽  
И.В. Штром ◽  
...  
Keyword(s):  
Room Temperature ◽  
Molecular Beam ◽  
Stark Effect ◽  
Visible Range ◽  
Bohr Radius ◽  
Two Photon ◽  
Photon Excitation ◽  
Dynamic Stark Effect ◽  
Inas Nanowires ◽  
Characteristic Maximum

The spectral and nonlinear optical properties of InAs nanowires suspensions in isopropanol were studied at room temperature. InAs nanowires were synthesized by molecular beam epitaxy. The absorption spectra of suspensions with a characteristic maximum at a wavelength of 235 nm were obtained, as well as Raman spectra in the range 180–280 cm – 1. The nonlinear transmission of InAs nanowires with a diameter less than the Bohr radius of the exciton upon two-photon excitation in the transparency region in the visible range (λ = 468 nm) was studied firstly. The effect of cumulative bleaching was discovered, the manifestation of which is associated with the dynamic Stark effect.

Interference phenomena in two-photon transitions caused by laser-induced ac-Stark effect

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1273-1283 ◽  
Author(s):  
A. F. Linskens ◽  
N. Dam ◽  
J. R. Reuss ◽  
B. Sartakov
Keyword(s):  
Stark Effect ◽  
Molecular State ◽  
Pump Laser ◽  
Probe Laser ◽  
Destructive Interference ◽  
Optical Bloch Equations ◽  
Two Photon ◽  
Photon Transition ◽  
Photon Excitation ◽  
Ac Stark Effect

A system is described in which a real molecular state is tuned into and out of resonance with the intermediate level of a two-photon transition, by the laser-induced ac-Stark effect. Two narrow-band CO2 wave-guide lasers are utilized to induce rovibrational transitions in the ν3 ladder of SF6. A weak probe laser monitors the absorption for the [Formula: see text] two-photon transition. Simultaneously, a strong pump laser is in resonance with the [Formula: see text] one-photon transition. The ac-Stark splitting is observed and quantum interferences between two-photon amplitudes involving different intermediate states occur. It is demonstrated that destructive interference allows suppression of the two-photon excitation for an appropriate pump laser power. Simulations based on the Dressed State Picture and the optical Bloch equations show a satisfactory agreement with the experiment.

scholarly journals Optical bistability in InSb at room temperature with two‐photon excitation

1983 ◽  
Vol 42 (4) ◽  
pp. 334-336 ◽  
Author(s):  
A. K. Kar ◽  
J. G. H. Mathew ◽  
S. D. Smith ◽  
B. Davis ◽  
W. Prettl
Keyword(s):  
Optical Bistability ◽  
Room Temperature ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Evidence for a dynamical stark effect in CO(A1Π) two-photon excitation

1983 ◽  
Vol 102 (2-3) ◽  
pp. 168-173 ◽  
Author(s):  
B. Girard ◽  
N. Billy ◽  
J. Vigue ◽  
J.C. Lehmann
Keyword(s):  
Stark Effect ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Two-photon interference spectra induced by a bichromatic field in the excited state of a single three-level ion

1992 ◽  
Vol 70 (1) ◽  
pp. 1-23 ◽  
Author(s):  
Constantine Mavroyannis
Keyword(s):  
Excited State ◽  
Ground State ◽  
Correlation Functions ◽  
Stark Effect ◽  
Stimulated Emission ◽  
Laser Fields ◽  
Two Photon ◽  
Dynamic Stark Effect ◽  
Two Peaks ◽  
Photon Resonance

We consider the interference spectra arising from the competition between a spontaneous process and two processes induced by two laser fields, which are coupled with a three-level atom in the "Λ" configuration. In the low-intensity limit of both laser fields and on two-photon resonance, the frequency profiles of the two peaks, which arise from the spontaneous and induced processes, cancel each other out completely at the center of the line for zero detuning and at the finite values of the detuning as well. At high intensities of the laser fields and on two-photon resonance, the dynamic Stark effect dominates the spectra of the excited state of the atom. Expressions for the interference spectra and correlation functions are derived, which describe the physical process of the absorption of a laser photon at two different times by the ground state of the atom. Interference spectra and correlation functions are calculated for the two-photon off-resonance and for the proces of the absorption of a photon by the ground state of the atom. In this case, the intensities of the frequency dips take negative values indicating that stimulated emission prevails for certain values of the detunings. Using values for the parameters involved close to those for Ba+, the computed two-photon resonance and off-resonance spectra are graphically presented and discussed.

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