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Article
Observation of Quantum Beats of Two-Photon-Excited States of Xe upon Photoionization
Ionization of coherently two-photon-excited superposition of 4f states of Xe in a supersonic atomic beam is studied by means of femtosecond pump–probe spectroscopy. Oscillatory structure in the photoionization si...
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Article
Satellite Transition of the Resonance Doublet of the Na Atom in a Mixture with CF4
The excitation spectrum of the resonance luminescence of Na atoms in a mixture with CF4 exhibits a satellite transition corresponding to the simultaneous optical excitation of the colliding atom and molecule, Na(
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Article
Interaction of Phase-Modulated Femtosecond Pulses with an Optically Dense Quasi-Resonant Medium of Rubidium Vapors
For the first time, it is demonstrated that the magnitude and sign of the effect of “spectral condensation” of a laser pulse at the resonant-transition frequency of a dense medium can be controlled by changing...
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Article
Electron and multiphoton ionization of xenon
A method for determining photoionization cross sections based on comparison of the characteristics of electron- and photon-impact processes is described, discussed, and demonstrated to have many advantageous f...
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Article
Lasers in analysis: Potential and prospects for the development of ultrashort pulsed lasers
The main achievements in the analytical application of lasers, their potential applications, and prospects for further development of this field were described. The role of laser generation conditions and mode...
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Article
Observation of parametric nonadiabatic excitation of collective resonances under femtosecond optical pum** of a dense resonant extended medium without population inversion under the conditions of strong light-matter coupling
We experimentally studied the superradiance of the resonant line of rubidium under femtosecond optical pum** of a dense extended medium without population inversion under conditions of strong lightmatter cou...
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Article
Discharge plasma in an argon–water vapor mixture as a gas laser medium
The possibility of obtaining the inverse population of the excited states of hydroxyl molecules generated in low-pressure discharge plasma in an Ar–H2O mixture was studied. The possibility of inversion of both th...
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Article
Study of four-wave mixing in the femtosecond laser pulse propagation near the resonance rubidium doublet
In this paper, we investigated the coherent degenerate and nondegenerate four-wave interaction in the propagation of a femtosecond laser pulse in atomic rubidium vapor. In the case of degenerate four-wave inte...
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Article
Measuring femtosecond lifetimes of free charge carriers in gallium arsenide
Peculiarities of the measurement of femtosecond lifetimes of free charge carriers in gallium arsenide grown by the method of molecular beam epitaxy are considered. The carrier lifetime is determined by a varia...
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Article
Effect of annealing on the nonequilibrium carrier lifetime in GaAs grown at low temperatures
GaAs samples grown by molecular-beam epitaxy at low (230°C) temperatures are investigated. One of the samples is subjected to aftergrowth annealing at 600°C. Using an unconventional pump-probe scheme for measu...
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Article
Experimental evaluation of the carrier lifetime in GaAs grown at low temperature
The relaxation dynamics of nonequilibrium charge carriers in gallium arsenide epitaxial films grown by molecular-beam epitaxy at low temperatures has been studied. The growth conditions of the epitaxial layer ...
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Article
The study of ungerade electronic states of the Xe2 molecules in the region of Xe*(5p 56p, 5d, 7s, 6d) by the resonance multiphoton ionization method
Electronic spectra of the Xe2 molecules in the energy range of 77700–89300 cm−1 are recorded. The method of resonance enhanced multiphoton ionization of molecules in a supersonic molecular beam was used, in which...
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Article
Electronic spectra of XeNe molecules in the range 77100-90100 cm-1 near Xe* (6p, 5d, 6p’, 7s, 7p, 6d) obtained by the (3 + 1) REMPI and (2 + 1) REMPI methods
The electronic spectra of XeNe molecules in the range of 77100-90100 cm-1 are measured by the method of laser resonance multiphoton ionization in a supersonic jet. The photoionization spectra are obtained upon tw...
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Article
Study of the lowest electronic states of Xe2, XeKr, and XeAr molecules by the method of multiphoton resonance ionization
The spectra of Xe2, XeKr, and XeAr molecules in the range 66 500–68 800 cm−1 are obtained by the methods of (2 + n) and (3 + n) (n = 1, 2, 3) resonance multiphoton ionization during the registration of molecular ...
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Article
Multiphoton mass spectra of XeKr molecules in the range of excited Xe*6p[5/2]2, 3 atoms
Data on excited states of XeKr molecules in the energy range 78280–77600 cm−1 are obtained. Using the method of multiphoton laser photoionization of molecules in a supersonic jet, five vibrational progressions of...
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Article
Multiphoton mass spectra of Xe2 molecules in the range of excited Xe*(6p, 5d) atoms
The (2 + 1) photoionization mass spectra of Xe2 molecules are studied in a supersonic jet upon excitation by laser radiation in the energy range 80321.3–77821 cm−1, corresponding to the dissociation of the Xe2 mo...
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Article
Resonant Optical Nonlinearity in Vitreous Semiconductors
Upconversion pum** of rare-earth ions in a semiconductor optical medium under particular conditions leads to an increase in the refractive index. The mechanism of the effect observed implies that, upon doubl...
