by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English
|Other titles||Partial wave representations of laser beams for use in light scattering calculations.|
|Statement||Gérard Gouesbet, James A. Lock, and Gérard Gréhan.|
|Series||[NASA contractor report] -- NASA-CR-204824., NASA contractor report -- NASA CR-204824.|
|Contributions||Lock, James A., Grehan, Gérard., United States. National Aeronautics and Space Administration.|
|The Physical Object|
beam BSC's for the off-axis case have not yet been discovered, to our knowledge. In this paper we consider two aspects of the partial-wave representation of laser beams for use in GLMT scattering calculations. (ai In the context of an on-axis focused Gaussian beam, we examine the convergence properties of the infinite series thatCited by: In the framework of generalized Lorenz–Mie theory, laser beams are described by sets of beam-shape coefficients. The modified localized approximation to evaluate these coefficients for a focused Gaussian beam is presented. A new description of Gaussian beams, called standard beams, is introduced. A comparison is made between the values of the beam-shape coefficients in the framework of the. Get this from a library! Partial-wave representations of laser beams for use in light-scattering calculations. [Gérard Gouesbet; James A Lock; Gérard Grehan; United States. National Aeronautics and Space Administration.]. This paper is devoted to the description of the interaction between a spherical particle and a laser sheet beam (Gaussian beam focused by a cylindrical lens) by using the generalized Lorenz‐Mie theory (GLMT). Partial-wave representations of laser beams for use in light-scattering calculations, Applied Optics, /AO, 34,
ehan, “Partial-wave representations of laser beams for use in light-scattering calculations” Applied Opt – ().  G. Gouesbet, “Partial-wave expansions and properties. A different approach to model a focused Gaussian laser beam that has enjoyed much use in light scattering calculations consists of expanding the beam fields as a Taylor series in powers of the beam confinement parameter s=λ/2πw 0. This requires that the wave equation be similarly decomposed, leading to an infinite set of coupled differential. particle size distribution with the assistance of laser scattering. Basic design of a Laser Particle Sizer. Basically the design is always the same: A light beam, mostly supplied by a laser, shines through the sample to be measured and behind it, the intensity distribution caused by the scattering is picked up with a detector. Here already, it. Light Scattering Introduction Figure shows light scattering oﬀ a particle in solution or in vacuum. The incident light scatters in all diﬀerent directions. The intensity of the scattered light depends on the polarizability (to be deﬁned later) and the polarizability depends on .
Abraham Katzir, in Encyclopedia of Physical Science and Technology (Third Edition), III.C Lasers and Fibers. Laser beams in the visible and NIR (λ = – μm) are transmitted by silica-glass fibers and have been used for transmitting the radiation of Ar, dye, Nd:YAG, and GaAs lasers. Excimer laser radiation at λ = – nm can be transmitted only through pure silica fibers. To take these deviations into account when calculating light scattering of an off-axis beam by a spherical particle, we use our phase-modeling method to approximate the beam-shape coefficients in. 1. Ensemble Methods: Low Angle Laser Light Scattering (LALLS – Laser Diffraction) This method uses a laser beam passing through a sample of particles in suspension (in liquid or air for instance), and collects light intensity data at different (low) scattering angles away from the axis of the laser beam. Focused electromagnetic beams are frequently modeled by either an angular spectrum of plane waves or a partial-wave sum of spherical multipole waves. The connection between these two beam models is explored here. The partial-wave expansion of an angular spectrum containing evanescent components is found to possess only odd partial waves. On the other hand, the partial-wave expansion of an.