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Advanced Functional Materials, EarlyView.Using nanobeam photoemission, we demonstrate imaging of the in‐plane and out‐of‐plane electric field landscape within a metal–semiconductor van der Waals heterostructure. We provide evidence for Schottky barrier formation that depends on the semiconductor thickness. ABSTRACT Achieving high‐performance optoelectronic devices based on two‐dimensional van
Dario Mastrippolito +17 more
wiley +1 more source
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Analysis of beam quality for the laser beams after spectral beam combining
Optik, 2010Abstract The beam quality of the laser beams after spectral beam combining (SBC) has been analyzed in this paper. Based on the propagation model of the spectral beam combining system, the expression for the output field of an individual beam passing through the spectral beam combining system with lens aberration has been given and the intensity ...
Yan Zhang, Bin Zhang
exaly +2 more sources
Beam quality measure for vector beams
Optics Letters, 2016Vector beams have found a myriad of applications, from laser materials processing to microscopy, and are now easily produced in the laboratory. They are usually differentiated from scalar beams by qualitative measures, for example, visual inspection of beam profiles after a rotating polarizer.
Bienvenu, Ndagano +4 more
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Beam quality specification for photon beam dosimetry
Medical Physics, 1993It is argued that %dd(10), the percentage depth dose at 10 cm in a 10×10 cm2 photon beam at a SSD of 100 cm, is a better beam quality specifier for radiotherapy beams than the commonly used values of or nominal accelerating potential (NAP). For radiation dosimetry purposes, is not an ideal beam quality specifier because (i) stopping‐power ratios for ...
Kosunen, A., Rogers, D. W.O.
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Method to evaluate beam quality of Gaussian beams with aberrations
Applied Optics, 2012Zernike polynomials are commonly used to describe the aberration of light beams, and the beam quality of Gaussian beams with aberrations can be deduced when the order of Zernike polynomials is limited. In this paper, Hermite polynomials are utilized to reconstruct the aberrations of Gaussian beams.
Yuntao, Qiu +5 more
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The beam quality of a truncated Gaussian beam with aberrations
Laser Physics Letters, 2013We present a method for the calculation of the beam quality factor of an aberrated laser beam. The closed-form equations are proved, and it is shown that the beam quality factor of an aberrated Gaussian beam depends directly on the Hermite coefficient of the wavefront, as well as the truncation ratio.
Yuntao Qiu +6 more
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Optics Communications, 1976
Abstract The homogeneity of various types of self-sustained TEA laser discharges in CO 2 -N 2 -He mixtures has been investigated. It is shown that the double Rogowski uv-preionized configuration is the most suitable for the attainment of high quality laser emission. In such systems refractive index variations are delayed for the longest period.
Dufour, M., Egger, H., Seelig, W.
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Abstract The homogeneity of various types of self-sustained TEA laser discharges in CO 2 -N 2 -He mixtures has been investigated. It is shown that the double Rogowski uv-preionized configuration is the most suitable for the attainment of high quality laser emission. In such systems refractive index variations are delayed for the longest period.
Dufour, M., Egger, H., Seelig, W.
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Quality of paraxial electromagnetic beams
Applied Optics, 2006The full wave theory of focused waves is developed and the radiation intensity distribution is determined. In the appropriate limit, the full wave theory correctly reproduces the paraxial beams. The limitations of paraxial beam theories are discussed. The method of treatment of full waves is presented with reference to the scalar Bessel-Gauss beam and ...
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Effect of holes and vortices on beam quality
Journal of the Optical Society of America A, 2000The effect of a vortex on the invariant quality factors of a light beam is studied. It is shown that a vortex degrades beam quality. The beam intensity at the eye of the vortex necessarily vanishes, creating a hole in the intensity distribution. The degradation in the beam quality is shown to be due partly to the vortex phase and partly to the hole ...
S, Ramee, R, Simon
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1983
There are a variety of mechanisms which change the refractive index of the medium in which the pulse propagates. These changes in the refractive index may lead to a distortion of the wave-front of the pulse, thereby increasing the energy losses of the beam and deteriorating its focusibility.
Günter Brederlow +2 more
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There are a variety of mechanisms which change the refractive index of the medium in which the pulse propagates. These changes in the refractive index may lead to a distortion of the wave-front of the pulse, thereby increasing the energy losses of the beam and deteriorating its focusibility.
Günter Brederlow +2 more
openaire +1 more source