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Article
Klyshko Method for Analog Photodetectors and Absolute Measurement of Photon Numbers
A modification of the Klyshko method is proposed for the reference-free calibration of analog photodetectors. It is shown that the photocurrent distribution of an analog detector can be approximated by a convo...
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Article
Schmidt Modes and the Time-Dependent Wavefunction of a Broadband Biphoton Field
The wavefunction of a broadband biphoton field arising in parametric down-conversion in an aperiodically polarized nonlinear crystal with a linear chirp under the action of a short pump pulse has been studied ...
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Article
Direct Measurement of the Correlation Function of Optical–Terahertz Biphotons
The second-order correlation function which characterizes the quantum correlation between the optical and terahertz photons generated under spontaneous parametric down-conversion has been measured for the firs...
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Article
Correlation Properties of an Optical–Terahertz Biphoton Field
The effect of the structure of angular modes of an optical–terahertz biphoton field appearing in strongly nondegenerate parametric down-conversion on the possibility of measuring nonclassical correlation prope...
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Article
Azimuthal eigenmodes at strongly non-degenerate parametric down-conversion
Quantum-optical technologies based on parametric light down-conversion are not yet applied in the terahertz frequency range. This is owing to the complexity of detecting single photons in the terahertz frequen...
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Article
Effective Group Velocity and Shape of Twin Beams
The shape and propagation velocities of pulsed twin beams generated in the process of parametric light down-conversion have been theoretically studied in the case where the delays caused by the dispersion of g...
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Article
Effect of Pump Depletion on the Spectrum of Twin Beams
The effect of pump depletion on the spectrum of twin beams, which appear in the process of collinear parametric down-conversion in a nonlinear crystal with an aperiodic domain structure and have a high degree ...
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Article
Photoinduced gratings in a Sn2P2S6 ferroelectric crystal with the period depending on the optical pump power
The light scattering in the form of ring structures in Sn2P2S6 crystals at the propagation of intense laser pump radiation along the b crystallographic axis is detected. Radiation passing through a crystal is com...
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Article
Study of the kinetics of domain structures in thin ferromagnetic films by the Wang-Landau method
The features of a phase transition between the strict striped domain structure in thin ferromagnetic films with transverse anisotropy and the so-called tetragonal phase, where domains can be twisted and broken...
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Article
Kinetics of the growth of domain blocks in KDP-type ferroelectric crystals
The process of the domain-block structure formation at the ferroelectric phase transition in KDP-type crystals is investigated. An effective Hamiltonian of the system is constructed; the growth of domain block...
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Article
Phase transition in the generalized Ising-Kosterlitz-Thouless model
The features of the phase transition are considered in a model that is a combination of the Ising and Kosterlitz-Thouless models. It is shown that one or two successive phase transitions may occur in such a sy...
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Article
Spatiotemporal self-organization upon two-wave mixing in a photorefractive medium
Nonlinear dynamics of recording volume holographic gratings upon two-wave mixing in an inertial photorefractive media were studied. It is found that the space-time dependence of the grating diffraction efficie...
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Article
Holographic-type parametric scattering: The universal character of the seed radiation
It is concluded on the basis of experimentally obtained time dependences of the intensity of holographic-type parametric scattering induced by artificially produced seed radiation in a photorefractive lithium ...
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Article
Nonlinear response of photorefractive lithium tantalate and niobate at acoustic frequencies
An amplification of the intensity of pump oscillations is observed experimentally at frequencies from 100 Hz to 1 kHz during photoinduced light scattering and holographic-type parametric scattering in photoref...