Showing papers on "Light field published in 1986"
TL;DR: The method of quasienergy states (QES) for describing a quantum system in the field of a monochromatic light wave is presented in this paper, where the perturbation theory for QES and quasistationary (decay) QES is developed.
217 citations
TL;DR: In this article, the authors measured the absolute phase of the surface second-harmonic light field with respect to the pump field, i.e. the phase of surface nonlinear susceptibility.
206 citations
Patent•
11 Jul 1986
TL;DR: In this paper, the authors present a device which enables the measurement of light scattering from microscopical particles and biological cells in two different regions of scattering angle in flow cytometers where the particles/cells are illuminated through microscope optics having high numerical aperture.
Abstract: A device which enables the measurement of light scattering from microscopical particles and biological cells in two different regions of scattering angle in flow cytometers where the particles/cells are illuminated through microscope optics (4) having high numerical aperture. A dark field image (2) of the particles/cells is formed on a slit (7) behind which is situated a telescope (10) which reproduces the angle distribution of the scattered light from the particles/cells. Light scattered from large angles (>15°) is separated from the light field behind this telescope by means of a mirror (13) in the central part of this light field reflecting the light into a first detector (14) while the remaining light which is dominated by small scattering angles falls on another detector (15).
39 citations
27 Oct 1986
TL;DR: This work presents an application of squeezed light to stability enhancement of optically bistable systems and indicates that such systems may exist either of two macroscopic metastable states thus determining their ultimate stability.
Abstract: Squeezed states of light, which demonstrate the essentially quantum nature of the light field, were recently produced in the laboratory. We present an application of squeezed light to stability enhancement of optically bistable systems.1 Such systems may exist either of two macroscopic metastable states. Quantum fluctuations induce tunneling between these states thus determining their ultimate stability.
26 citations
TL;DR: In this article, the statistical properties of photoelectric events in experiments where dead-times are introduced into a propagating light field by the use of a detection-triggered optical shutter are investigated.
Abstract: We investigate the statistical properties of photoelectric events in experiments where dead-times are introduced into a propagating light field by the use of a detection-triggered optical shutter. Theoretical results are derived for various optical arrangements generating both analogue and genuine non-classical effects. The validity of the formulae is tested by numerical simulation.
16 citations
TL;DR: In this article, a new method to measure the degree of spatial coherence of partially coherent quasi-monochromatic thermal light is proposed by using double-exposure specklegrams.
9 citations
TL;DR: In this paper, the two-electron wave function for negative alkali ions is analyzed and the analytic expressions for the dynamic polarisability of the negative ion and for the multiphoton photodetachment cross sections are obtained.
Abstract: The two-electron wavefunction for negative alkali ions is analysed. It follows that the states of weakly bound and external optical electrons are not equivalent. For a description of the nonlinear interaction of negative alkali ions with a light field this fact makes it possible to apply a quasi-classical approximation, from which the analytic expressions for the dynamic polarisability of the negative ion and for the multiphoton photodetachment cross sections are obtained.
7 citations
TL;DR: In this paper, the Lax representations for the corresponding nonlinear evolution equations are presented, and the soliton solution describing resonance Raman scattering is obtained, where three-wave selfinteraction and the resonance interaction with three-level atomic systems of a multifrequency light field are considered.
5 citations
TL;DR: In this article, a method for measuring the transverse spatial correlation function of a random phase of a homogeneous scalar light field is proposed, which is based on wavefront-shearing interferometric methods.
Abstract: Wavefront-shearing interferometric methods for measuring the energy of the scattered component of a light wave were tested experimentally. A method is proposed for measuring the transverse spatial correlation function of a random phase of a homogeneous scalar light field.
2 citations
Journal Article•
TL;DR: In this paper, a simple light field configuration for focusing an atomic beam is described which is formed by four divergent Gaussian laser beams propagating along the + or - x and + or y directions of a Cartesian coordinate system.
Abstract: An experimental realization of the focusing of an atomic beam by a spontaneous radiation pressure force is reported. A simple light field configuration for focusing an atomic beam is described which is formed by four divergent Gaussian laser beams propagating along the + or - x and + or - y directions of a Cartesian coordinate system. An experimental arrangement for the laser focusing is shown, and the experimental procedure is described. The resulting atomic beam profiles are shown and discussed. It is concluded that the experiments open up the possibility of gaining control over such parameters of atomic beams as their density and divergence. 7 references.
2 citations
TL;DR: In this paper, the propagation of light through a statistically homogeneous medium is investigated using the radiative transfer theory that yields linear equations for intensities in the case where the medium has a negligible emission of its own.
Abstract: The propagation of light through a statistically homogeneous medium is investigated using the radiative transfer theory that yields linear equations for intensities in the case where the medium has a negligible emission of its own. This condition makes it possible to decompose the total light field in a series of eigen-solutions, designated as 'beam fields', associated with eigen-values, which yield the extinction coefficients of the beam fields. The medium under test being limited by two interfaces, the coefficients to be ascribed to a given field are determined by boundary equations. The basic properties of eigen-solutions are described as well as their corresponding eigen-values. Forward and back scattering indicatrices are established for fiber layers of different thicknesses under illumination at several incidence angles. Results are rather easy to interpret, if the layers are thick enough and scatter much more light than they absorb. In that case there exists a 'beam field' which fades out very much less than all others. This gives a simple way to explain depolarization effects of the scattered light and also a clue to appreciate the validity of simplified theories, known as two-wave theories.
TL;DR: In this article, the acoustooptic interaction of complex optical and acoustic radiation fields in a crystal is investigated and a general solution of this equation is found for weak Bragg interaction.
Abstract: The acoustooptic interaction of complex optical and acoustic radiation fields in a crystal is investigated. Differential equations are obtained for the diffracted light field in an anisotropic medium. A general solution of this equation is found for weak Bragg interaction. The problem of strong acoustooptic interaction in the field of a focused acoustic wave is solved. The solutions describe the diffracted field near the acoustic lens and also in the vicinity of its focus. The asymptotic behavior of the solutions at small and large acoustic powers is determined.
01 Jan 1986
TL;DR: In this article, the polarization properties of light fields in media with strongly anisotropic media were investigated using the small-angle approximation, as applied to the scalar problem of radiation transport, in order to study polarized radiation transport.
Abstract: The authors study the solution of several equations and investigate the polarization properties of light fields in media with strongly anisotropic media. This allows one to use the small-angle approximation, as applied to the scalar problem of radiation transport, in order to study polarized radiation transport. The authors provide an analysis of the equations which establish a concept of the physical pattern of transformations with depth of the polarization structure of a light field in a medium. The results obtained make it possible to determine the rates of changes in transmittance of various characteristics.