Author
J. M. Cuadrado
Bio: J. M. Cuadrado is an academic researcher from Complutense University of Madrid. The author has contributed to research in topics: Modal dispersion & Spontaneous emission. The author has an hindex of 6, co-authored 6 publications receiving 155 citations.
Papers
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TL;DR: In this paper, the Fraunhofer and Fresnel diffraction patterns produced by a thin linear axicon when it is illuminated by a plane wavefront were determined, and an interferometric method of recording zone plates using linear axicons was presented.
Abstract: We determine the Fraunhofer and Fresnel diffraction patterns produced by a thin linear axicon when it is illuminated by a plane wavefront. An interferometric method of recording zone plates using linear axicons is presented.
70 citations
TL;DR: In the reconstruction, the effects of linear and nonlinear recording produce the appearance of linear foci situated symmetrically on both sides of the zone plates.
Abstract: Elliptical and hyperbolic zone plates have been constructed by optical methods recording on a photosensitive material the model produced by coherent superposition of two wave fronts, one spherical and the other cylindrical. When the foci of the wave fronts coincide, we have linear zone plates. In the reconstruction, the effects of linear and nonlinear recording produce the appearance of linear foci situated symmetrically on both sides of the zone plates. Experimental results are presented.
28 citations
27 citations
TL;DR: The image planes and the transmittance function for a conical gradient-index (GRIN) rod is determined, and the problem of modal propagation is considered.
Abstract: In this paper we determine the image planes and the transmittance function for a conical gradient-index (GRIN) rod, and we consider the problem of modal propagation.
16 citations
TL;DR: The location of image and transform planes and the equivalent focal length for a parabolic gradient-index rod are determined and the problem of modal propagation is considered.
Abstract: In this paper we determine the location of image and transform planes and the equivalent focal length for a parabolic gradient-index rod, and we consider the problem of modal propagation.
10 citations
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TL;DR: This work shows by the method of stationary phase that any of these wave fields can be realized approximately with a laser and a single computer-generated hologram, and demonstrates experimentally the formation of arbitrary-order Bessel beams and rotationally nonsymmetric beams.
Abstract: A new class of solutions to the scalar wave equation was introduced recently that represents transversely localized but totally nondiffracting fields. We show by the method of stationary phase that any of these wave fields can be realized approximately with a laser and a single computer-generated hologram. We briefly discuss various techniques for coding and fabrication of the required hologram and the associated diffraction efficiencies. Using both binary-amplitude and four-level phase holograms, we demonstrate experimentally the formation of arbitrary-order Bessel beams and rotationally nonsymmetric beams.
668 citations
TL;DR: In this article, the authors proposed to obtain intense optical fields, whose form shows little change in size over long paths, through the use of either conical lenses or spherical lenses showing spherical aberration together with a single projecting lens.
Abstract: It is proposed to obtain intense optical fields, whose form shows little change in size over long paths, through the use of either conical lenses or spherical lenses showing spherical aberration together with a single projecting lens. The conical lens is shown to produce fields whose transverse structure is given by a zero-order Bessel function J0, while the spherical aberrating lens produces (real or virtual) J0-like transverse structures, provided that the central portion of the aberrating lens is occluded. In all cases projection gives a J0 real-image optical structure. Intensity, size of the transverse structure, and range considerations are developed, and some aspects of optimization are discussed. A negative aberrating lens gives a long range of nearly constant size in the image field, and a universal expression is presented to describe the image size as a function of image distance for this case. Projection with an aberrating projection lens is shown to improve the constancy of the final J0 pattern size dramatically. Typical photographic results are included for beams generated by using a low-power He–Ne laser. Brief considerations of practical uses of diffractionless beams are presented.
550 citations
TL;DR: A review of recent developments on entanglement and nonclassical effects in collective two-atom systems and a uniform physical picture of the many predicted phenomena can be found in this article.
404 citations
363 citations
TL;DR: In this article, the non-diffractive vector Bessel beams of an arbitrary order are examined as both the solution to the vector Helmholtz wave equation and the superposition of vector components of the angular spectrum.
Abstract: The non-diffractive vector Bessel beams of an arbitrary order are examined as both the solution to the vector Helmholtz wave equation and the superposition of vector components of the angular spectrum. The transverse and longitudinal intensity components of the vector Bessel beams are analysed for the radial, azimuthal, circular and linear polarizations. The radially and azimuthally polarized beams are assumed to be formed by the axicon polarizers used with the initially unpolarized or linearly polarized light. Conditions in which the linearly polarized Bessel beams can be approximated by the scalar solutions to the wave equation are also discussed.
244 citations