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Beam-quality measurement of a focused high-order harmonic beam
Optics Letters, 1998Using a multilayer spherical mirror, we focus the high-order harmonic radiation produced near 55 nm by the nonlinear interaction of an intense femtosecond laser pulse and a xenon gas jet. The focused XUV beam is characterized by a knife-edge technique in the focal region and by far-field imaging.
L, Le Déroff, P, Salières, B, Carré
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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
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Experimental validation of beam quality correction factors for proton beams
Physics in Medicine and Biology, 2015This paper presents a method to experimentally validate the beam quality correction factors (kQ) tabulated in IAEA TRS-398 for proton beams and to determine the kQ of non-tabulated ionization chambers (based on the already tabulated values). The method is based exclusively on ionometry and it consists in comparing the reading of two ionization chambers
Carles, Gomà +3 more
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Laser beam quality measurements
Proceedings of LFNM'2001. 3rd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.01EX463), 2002Usually a laser beam is a mixture of Hermite-Gauss or Laguerre-Gauss modes. These beams don't change their shape when propagating through first order optics. Then kurtosis, on-axis intensity, and Strehl ratio will be invariant or dependent on main parameters such as widths and areas.
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High quality laser beam soldering
Microsystem Technologies, 2002In the work presented the potential of a pyrometric process control during laser beam soldering will be enhanced. Primarily we have developed a processing head with an integrated up-to-date pyrometric sensor conditioned for the temperature range of soft soldering.
L. Bosse +3 more
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1983
The ability to control dose in terms of absolute value, repeatability from wafer to wafer, and uniformity across a wafer is the most important characteristic of any implanter.
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The ability to control dose in terms of absolute value, repeatability from wafer to wafer, and uniformity across a wafer is the most important characteristic of any implanter.
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[Beam quality conversion factor].
Igaku butsuri : Nihon Igaku Butsuri Gakkai kikanshi = Japanese journal of medical physics : an official journal of Japan Society of Medical Physics, 2014This report describes the update of the beam quality conversion factor k(Q,Q0) of the standard dosimetry protocol in Japan. The k(Q,Q0) corrects for the difference between the response of an ionization chamber in the reference beam quality Q0 used for calibrating the chamber and in the actual user beam quality Q.
Toru, Kawachi, Tetsurou, Katayose
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Beam Quality Improvement at JULIC
IEEE Transactions on Nuclear Science, 1979To improve the external beam quality at JULIC, three different measures have been undertaken: the development of a systematic procedure for beam phase optimization, the precise adjustment of the center region to nominal values as well as the installation of harmonic coils near the cyclotron center and the introduction of two axial phase slits according
J. Reich +3 more
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SPIE Proceedings, 2007
The questions of optical beam quality of COIL are considered. The classification and meanings of different type of optical aberrations in COIL is presented. The ways of compensation of amplitude aberration by structure-parametrical optimization of the unstable resonator are offered. The scheme of automatically resonator alignment for compensation of
A. S. Boreysho +3 more
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The questions of optical beam quality of COIL are considered. The classification and meanings of different type of optical aberrations in COIL is presented. The ways of compensation of amplitude aberration by structure-parametrical optimization of the unstable resonator are offered. The scheme of automatically resonator alignment for compensation of
A. S. Boreysho +3 more
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Beam Quality Metric Conversion
2013This chapter shows how to perform conversions between common beam quality metrics. It is important to emphasize that conversions between metrics are not generally possible without additional information about the beam and aberrations. Section 4.1 shows conversions for Gaussian beams that degrade as ensembles of higher-order modes and can be described ...
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