نتایج جستجو برای: gaussian beam
تعداد نتایج: 186825 فیلتر نتایج به سال:
We demonstrate the use of neareld scanning optical microscopy (NSOM) for the measurement of the beam properties of SQW-GRINSCH ridge laser diodes. Using NSOM, we measure the eld intensity in the transverse plane at neareld and as a function distance from the facet. The divergence of the laser beam and the beam waists in vertical and lateral dimensions are directly measured and the astigmatism o...
We have developed multifunctional optical beam shapers based on plasmonic metasurfaces. The metasurfaces are composed of subwavelength-spaced polarization- and wavelength-selective optical nanoantennas that allow encoding several beam shapers on a single element. We demonstrate numerically and experimentally beam shapers that can be used to switch between arbitrary beam shapes. We specifically ...
In December 2003, the SIS-18 delivered a 350 MeV/u intense uranium beam and a record high intensity of more than 4 × 10 particles was achieved. The beam focal spot was elliptic while the beam power profile along the radial direction was Gaussian with a (FWHM)x = 0.85 mm and (FWHM)y = 1.6 mm. The experimentally measured temporal beam power profile is shown in Fig.1 which is very similar to a Gau...
Abstract. In this paper, a two-parameter discrete Gaussian beam summation is described and then applied to SH seismic waves in a layer over a half space. For this case the exact solution for the wide-angle reflection and head wave is known by the summation of plane waves or from the modified-Cagniard method. Using Gaussian beam summations over a single angle parameter, the wide-angle reflection...
An overview of the history and current practices of laser beam shaping is presented. When diffraction effects are not important, geometrical methods for laser beam shaping (ray tracing, conservation of energy within a bundle of rays, and the constant optical path length condition) can be used to determine system configurations, including aspheric elements and spherical-surface GRIN lenses, whic...
This paper introduces a wavepacket-transform-based Gaussian beam method for solving the Schrödinger equation. We focus on addressing two computational issues of the Gaussian beam method: how to generate a Gaussian beam representation for general initial conditions and how to perform long time propagation for any finite period of time. To address the first question, we introduce fast Gaussian wa...
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