3 edition of Interpretation of extinction in Gaussian-beam scattering found in the catalog.
Interpretation of extinction in Gaussian-beam scattering
by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va
Written in English
|Statement||James A. Lock.|
|Series||[NASA contractor report] -- NASA-CR-204823., NASA contractor report -- NASA CR-204823.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
The total extinction cross section is a sum of scattering cross section and absorption cross section. A fundamental relation in the scattering of plane waves, called the optical theorem or extinction theorem, 1 1. R. G. Newton, “ Optical theorem and beyond,” Am. J. Phys. 44(7), – ().Cited by: 1. The eﬀective scattering volume is deﬁned and applied to a CTS system using strongly focused beams and its validity is examined experimentally. c The Japan Society of Plasma Science and Nuclear Fusion Research Keywords: collective Thomson scattering, ECRH, gyrotron, Gaussian beam, scattering volume DOI: /pfrS 1. Introduction.
In RCS estimation, usually a plane wave is assumed; while in real measurements at terahertz frequencies, generally a Gaussian beam or a similar beam source is adopted. In this paper, the RCS of a conducting sphere is discussed under the condition that the incident wave is a Gaussian beam. In the estimation, the influence of THz collimated laser beam on RCS is discussed and the RCS Cited by: For surface velocity distributions that are less discontinuous (smoother), the number of terms in the Gaussian beam solution is reduced. In the extreme case of a Gaussian radiator, only one term is needed. The approach, then, reduces the study of any axisymmetric beam Cited by:
Some relations between Gaussian beams, complex rays and the analytic extension of the Green's function in smoothly inhomogeneous media are shown in this paper. It is found that: (1) a single Gaussian beam is a paraxial approximation of the analytical extension of the ray-approximated Green's function in smoothly inhomogeneous media by putting Cited by: Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of radiation, as a function of frequency or wavelength, due to its interaction with a sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum.
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James A. Lock Vol,No.5/May / A Interpretation of extinction in Gaussian-beam scattering NASA-CR James A. Lock Deportment of Physics, Cleveland State University, Cleveland, Ohio File Size: KB.
Interpretation of extinction in Gaussian-beam scattering James A. Lock Department of Physics, Cleveland State University, Cleveland, Ohio Received J ; revised manuscript received Novem ; accepted Novem The extinction efficiency for the interaction of a plane wave with a large nonabsorbing spherical.
Get this from a library. Interpretation of extinction in Gaussian-beam scattering. [James A Lock; United States. National Aeronautics and Space Administration.]. Improved Gaussian beam-scattering algorithm James A. Lock - i i The localized model of the beam-shape coefficients for Gaussian beam-scattering theory by a spherical particle provides a great simplification in the numerical implementation of the theory.
We derive anCited by: The forward scattering of a Gaussian laser beam by a spherical particle located along the beam axis is analyzed with the generalized Lorenz-Mie theory (GLMT) and with diffraction theory.
Analyzing the Propagation Behavior of a Gaussian Laser Beam through Seawater and Comparing with Atmosphere F. Kashani* Absorption and Scattering, Extinction coefficient, Mean Irradiance, Propagation of Gaussian Beams, Seawater.
distribution of laser diode Gaussian beam, which propagates through op tical path in seawater, is Size: KB. Lasers often generate so-called Gaussian beams, where the transverse profile of the beam's electric field distribution can be described with a Gaussian function.
Here, r is the distance from the beam axis, z is the coordinate along the propagation direction, w(z) is the so-called Gaussian beam radius, and φ(z,r) is a term describing the phase evolution along the beam as well as the.
Extinction paradox and actual power scattered in light beam scattering: A two-dimensional study Article in Journal of the Optical Society of America A 21(12) January with 11 Reads.
The Gaussian beam is a transverse electromagnetic (TEM) mode. The mathematical expression for the electric field amplitude is a solution to the paraxial Helmholtz equation. Assuming polarization in the x direction and propagation in the +z direction, the electric field in phasor (complex) notation is given by: (,) = ^ (− ()) (− (+ − ())),where.
is the radial distance from the center. Abstract: The authors have show that scattering matrix theory enables Gaussian beam mode analysis to be extended in a straightforward way to take account of multiple reflections and scattering between modes.
The use of propagating modes as basis functions, unlike those of fourier optics, allows the treatment of a vastly expanded range of problems. Correlation Migration Using Gaussian Beams of Scattered Teleseismic Body Waves by Robert L.
Nowack, Saptarshi Dasgupta, Gerard T. Schuster, and Jian-Ming Sheng Abstract Correlation migration for structural imaging using Gaussian beams is described for the inversion of passively recorded teleseismic waves.
Gaussian beam. In summary, by measuring the power received by a detector placed in the forward direction with respect to the incoming Gaussian beam, according to what we call ‘Procedure I’, the estimated value for the extinction cross section is: (10) C e x t I = π ω 0 2 (1 − P t c P i c) = π ω 0 2 (P i c − P t c P i c)Cited by: 1.
Gaussian beam nonspecular scattering is analysed in a framework of the complex-ray geometrical optics with a planar dielectric interface or multilayer Cited by: 7. This paper According to the local approximate solution and finite series expression to the beam coefficients presented by Gouesbet and otherwise, we put forword a comprehensive recursive continued fraction algorithm and modify the defect of the existing algorithm, three key functions in scattering light intensity are recursively operated respectively, Mie scattering coefficient is obtained by Cited by: 2.
where [zeta] is the complex scalar function that defines the non-plane part of the Gaussian Beam. Supposing the direction of propagation be in the positive Z orientation (shown in Figure 1), the fundamental Gaussian Beam mode of E-field distribution with the paraxial approximation in rectangular coordinates (two dimension) is shown in Equation (2).
A full-wave theory of plane wave scattering from rough surfaces called the Correction Current (CC) method was recently developed for the two-dimensional scatter problem that have a one-dimensional roughness profile. The method involves a primary field and radiation modes that are plane-wave-type fields that satisfy the boundary conditions at the rough by: 3.
Book description: This 3rd volume Light Scattering Reviews is devoted to modern knowledge and milestones in both experimental and theoretical techniques related to light scattering and radiative transport problems. It will consist of 3 parts comprising 11 contributions written by world leading experts in their respective fields.
References Ostwald, W. () Die Welt der vernachlässigten Dimensionen. Eine Einführung in die moderne Kolloidchemie mit besonderer Berücksichtung ihrer Anwendungen. The Gaussian beam solution of Maxwell’s equations for the electric vector E is given by:. and are units vectors in the 0x and 0z directions respectively and U(r) is the complex amplitude of the scalar Gaussian beam.
The Gaussian Beam €. E (. r)=E 0 (−ˆ x + x z+iz 0 ˆ z)U(. r) € x ˆ € z ˆ. Based on the derivatives between the fundamental and higher-order Hermite Gaussian beam and the Davis’s one-order approximation of slowly varying function, a general expression of the higher-order Hermite Gaussian beam are presented.
Scattering characteristics of higher-order off-axis Hermite Gaussian is investigated. Some selected calculations on the effects of the beam waist width and the Author: Tan Qu, Zhen Sen Wu, Hai Ying Li, Zheng Jun Li.
Gaussian beams are usually considered in situations where the beam divergence is relatively small, so that the so-called paraxial approximation can be applied. This approximation allows the omission of the term with the second-order derivative in the propagation equation (as derived from Maxwell's equations), so that a first-order differential equation results.The Debye series has been a key tool for the understanding of light scattering features, and it is also a convenient method for understanding and improving the design of optical instruments aimed at optical particle sizing.
Gouesbet has derived the Debye series formulation for generalized Lorenz-Mie theory (GLMT). However, the scattering object is a homogeneous sphere, and no numerical result.Abstract. The method of Gaussian Beams Summation is applied to the two important problems of the theory of elastic waves — the scattering of compressional wave from a planar crack embedded into a homogeneous and isotropic elastic medium and time-harmonic radiation of a normal transducer of arbitrary shape directly coupled to a homogeneous and isotropic elastic : Victor Zalipaev.