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Search Results: 1 - 10 of 1246 matches for " Solomon Saltiel "
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Efficient collinear third-harmonic generation in a single two-dimensional nonlinear photonic crystal
Todor Karaulanov,Solomon M. Saltiel
Physics , 2003, DOI: 10.1117/12.519086
Abstract: We propose novel multi-phase-matched process that starts with generation of a pair of symmetric second-harmonic waves. Each of them interacts again with the fundamental wave to produce two constructively interfering third harmonic waves collinear to the fundamental input wave.
A Tabulation and Critical Analysis of the Wavelength-Dependent Dielectric Image Coefficient for the Interaction Exerted by a Surface onto a Neighbouring Excited Atom
Solomon Saltiel,Daniel Bloch,Martial Ducloy
Physics , 2006, DOI: 10.1016/j.optcom.2006.03.034
Abstract: The near-field interaction of an atom with a dielectric surface is inversely proportional to the cube to the distance to the surface, and its coupling strength depends on a dielectric image coefficient. This coefficient, simply given in a pure electrostatic approach by (eps-1) / (eps+1) with eps the permittivity, is specific to the frequency of each of the various relevant atomic transition : it depends in a complex manner from the bulk material properties, and can exhibit resonances connected to the surface polariton modes. We list here the surface resonances for about a hundred of optical windows whose bulk properties are currently tabulated. The study concentrates on the infrared domain because it is the most relevant for atom-surface interaction. Aside from this tabulation, we discuss simple hints to estimate the position of surface resonances, and how uncertainties in the bulk data for the material dramatically affect the predictions for the image coefficient. We also evaluate the contribution of UV resonances of the material to the non resonant part of the image coefficient.
Spatial Optical Solitons due to Multistep Cascading
Yuri S. Kivshar,Tristram J. Alexander,Solomon Saltiel
Physics , 1999, DOI: 10.1364/OL.24.000759
Abstract: We introduce a novel class of parametric optical solitons supported simultaneously by two second-order nonlinear cascading processes, second-harmonic generation and sum-frequency mixing. We obtain, analytically and numerically, the solutions for three-wave spatial solitons and show that the presence of an additional cascading mechanism can change dramatically the properties and stability of two-wave quadratic solitary waves.
Multistep Parametric Processes in Nonlinear Optics
Solomon M. Saltiel,Andrey A. Sukhorukov,Yuri S. Kivshar
Physics , 2003,
Abstract: We present a comprehensive overview of different types of parametric interactions in nonlinear optics which are associated with simultaneous phase-matching of several optical processes in quadratic nonlinear media, the so-called multistep parametric interactions. We discuss a number of possibilities of double and multiple phase-matching in engineered structures with the sign-varying second-order nonlinear susceptibility, including (i) uniform and non-uniform quasi-phase-matched (QPM) periodic optical superlattices, (ii) phase-reversed and periodically chirped QPM structures, and (iii) uniform QPM structures in non-collinear geometry, including recently fabricated two-dimensional nonlinear quadratic photonic crystals. We also summarize the most important experimental results on the multi-frequency generation due to multistep parametric processes, and overview the physics and basic properties of multi-color optical parametric solitons generated by these parametric interactions.
Two-color multistep cascading and parametric soliton-induced waveguides
Yuri S. Kivshar,Andrey A. Sukhorukov,Solomon M. Saltiel
Physics , 1999, DOI: 10.1103/PhysRevE.60.R5056
Abstract: We introduce the concept of two-color multistep cascading for vectorial parametric wave mixing in optical media with quadratic (second-order or chi-2) nonlinear response. We demonstrate that the multistep cascading allows light-guiding-light effects with quadratic spatial solitons. With the help of the so-called `almost exact' analytical solutions, we describe the properties of parametric waveguides created by two-wave quadratic solitons.
Detection of slow atoms confined in a Cesium vapor cell by spatially separated pump and probe laser beams
Petko Todorov,Nikoolay Petrov,Isabelle Maurin,Solomon Saltiel,Daniel Bloch
Physics , 2013, DOI: 10.1117/12.2014930
Abstract: The velocity distribution of atoms in a thermal gas is usually described through a Maxwell-Boltzman distribution of energy, and assumes isotropy. As a consequence, the probability for an atom to leave the surface under an azimuth angle {\theta} should evolve as cos {\theta}, in spite of the fact that there is no microscopic basis to justify such a law. The contribution of atoms moving at a grazing incidence towards or from the surface, i.e. atoms with a small normal velocity, here called "slow" atoms, reveals essential in the development of spectroscopic methods probing a dilute atomic vapor in the vicinity of a surface, enabling a sub-Doppler resolution under a normal incidence irradiation. The probability for such "slow" atoms may be reduced by surface roughness and atom-surface interaction. Here, we describe a method to observe and to count these slow atoms relying on a mechanical discrimination, through spatially separated pump and probe beams. We also report on our experimental progresses toward such a goal.
Generation of the second-harmonic Bessel beams via nonlinear Bragg diffraction
Solomon M. Saltiel,Dragomir N. Neshev,Robert Fischer,Wieslaw Krolikowski,Ady Arie,Yuri S. Kivshar
Physics , 2007, DOI: 10.1103/PhysRevLett.100.103902
Abstract: We generate conical second-harmonic radiation by transverse excitation of a two-dimensional annular periodically-poled nonlinear photonic structure with a fundamental Gaussian beam. We show that these conical waves are the far-field images of the Bessel beams generated in a crystal by parametric frequency conversion assisted by nonlinear Bragg diffraction.
Multistep cascading and fourth-harmonic generation
Andrey A. Sukhorukov,Tristram J. Alexander,Yuri S. Kivshar,Solomon M. Saltiel
Physics , 2000, DOI: 10.1016/S0375-9601(01)00106-2
Abstract: We apply the concept of multistep cascading to the problem of fourth-harmonic generation in a single quadratic crystal. We analyze a new model of parametric wave mixing and describe its stationary solutions for two- and three-color plane waves and spatial solitons. Some applications to the optical frequency division as well as the realization of the double-phase-matching processes in engineered QPM structures with phase reversal sequences are also discussed.
Dicke Coherent Narrowing in Two-Photon and Raman Spectroscopy of Thin Vapour Cells
Gabriel Dutier,Petko Todorov,Ismahène Hamdi,Isabelle Maurin,Solomon Saltiel,Daniel Bloch,Martial Ducloy
Physics , 2005, DOI: 10.1103/PhysRevA.72.040501
Abstract: The principle of coherent Dicke narrowing in a thin vapour cell, in which sub-Doppler spectral lineshapes are observed under a normal irradiation for a l/2 thickness, is generalized to two-photon spectroscopy. Only the sum of the two wave vectors must be normal to the cell, making the two-photon scheme highly versatile. A comparison is provided between the Dicke narrowing with copropagating fields, and the residual Doppler-broadening occurring with counterpropagating geometries. The experimental feasibility is discussed on the basis of a first observation of a two-photon resonance in a 300 nm-thick Cs cell. Extension to the Raman situation is finally considered.
Temperature dependence of the dielectric permittivity of CaF2, BaF2 and Al2O3: application to the prediction of a temperature dependent van der Waals surface interaction exerted onto a neighbouring Cs (8P{3/2}) atom
Thierry Passerat De Silans,Isabelle Maurin,Pedro Chaves De Souza Segundo,Solomon Saltiel,Marie-Pascale Gorza,Martial Ducloy,Daniel Bloch,Domingo De Sousa Meneses,Patrick Echegut
Physics , 2009, DOI: 10.1088/0953-8984/21/25/255902
Abstract: The temperature behaviour in the range 22\degree C to 500\degree C of the dielectric permittivity in the infrared range is investigated for CaF2, BaF2 and Al2O3 through reflectivity measurements. The dielectric permittivity is retrieved by fitting reflectivity spectra with a model taking into account multiphonon contributions. The results extrapolated from the measurements are applied to predict a temperature-dependent atom-surface van der Waals interaction. We specifically consider as the atom of interest Cs (8P3/2), the most relevant virtual couplings of which, fall in the range of thermal radiation and are located in the vicinity of the reststrahlen band of fluoride materials.
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