Results 181 to 190 of about 5,854 (216)

Laser beam quality, entropy and the limits of beam shaping

Optics Communications, 1996
Abstract The paper presents a thermodynamical and quantum-statistical analysis of the electromagnetic field with the aim of deriving the entropy of partially coherent thermal and laser beams. Together with the second law of thermodynamics the knowledge of the entropy allows the discussion of the limits of beam shaping.
Th. Graf, J.E. Balmer
openaire   +1 more source

The beam quality of nonparaxial Hermite-sine-Gaussian beam

Optics Communications, 2008
Abstract Based on the theory of the second intensity moment of nonparaxial scalar beam and the method of angular spectrum, the expressions for the far-field divergence angle, waist width and M2 factor of nonparaxial Hermite-sine-Gaussian (HSiG) beams are derived.
Peihong Ding, Jun Qu, Kai Meng, Zhifeng Cui   +3 more
openaire   +1 more source

Matrix formulation of the beam quality of the Hermite-Gaussian beam

Laser Physics, 2009
Based on the M 2-parameter of Hermite-Gaussian beam, we deduced the matrix formulation of the beam quality for nonsymmetric two-dimensional Hermite-Gaussian beam, which at an arbitrary azimyth angle α. And coupled beam radius square, coupled M 2-parameter also have been introduced.
W. Li, G. Feng, Y. Huang, G. Deng, Yu Huang, J. Chen, Sh. Zhou   +6 more
openaire   +1 more source

Evaluation of the XeCl beam quality on the Stokes beam parameters

Optics Communications, 1996
Abstract The advantages of applying phase-unifying unstable cavities to excimer lasers for the production of multiple wavelengths by stimulated Raman scattering (SRS) have been evaluated. A XeCl laser has been fitted either with a phase-unifying (PU) unstable cavity, or with a conventional hard-edge unstable cavity, and SRS in high pressure H 2 has ...
M.R. Perrone, V. Piccinno
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Injection Beam Loss and Beam Quality Checks for the LHC

2010
The quality of the injection into the LHC is monitored by a dedicated software system which acquires and analyses the pulse waveforms from the injection kickers, and measures key beam parameters and compares them with the nominal ones. The beam losses at injection are monitored on many critical devices in the injection regions, together with the ...
Goddard, Brennan, Baggiolini, Vito, Bartmann, Wolfgang, Bracco, Chiara, Drøsdal, Lene, Holzer, Eva, Kain, Verena, Khasbulatov, Denis, Magnin, Nicolas, Meddahi, Malika, Nordt, Annika, Sapinski, Mariusz, Vogt, Mathias   +12 more
openaire   +1 more source

Beam quality evolution of vortex beam with phase distortion

Optik, 2018
Abstract Based on the generalized Huygens Fresnel principle, the propagation equation of fundamental Gaussian vortex beam with phase distortion is derived. To quantitatively analyze the influence of random phase distortion on the quality of vortex beam, the variance of light intensity relative deviation is proposed as the evaluation parameter.
Shiming Huang, Jianye Nie, Kangle Yong, Jiawei Yan, Rongzhu Zhang   +4 more
openaire   +1 more source

Beam Quality Assurance for Proton Clinical Beams at MedAustron

2016
Proceedings of the 7th Int.
Penescu, Liviu, Farinon, Fabio, Garonna, Adriano, Kronberger, Matthias, Kulenkampff, Tobias, Kurfürst, Christoph, Myalski, Szymon, Nowak, Sebastian, Osmić, Fadmar, Pivi, Mauro, Schmitzer, Claus, Urschütz, Peter, Wastl, Alexander   +12 more
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Beam quality

2022
Daniel Shaw, Jason Fazakerley, Ian Honey, Debbie Saunders   +3 more
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Quality of an x-ray beam

Oral Surgery, Oral Medicine, Oral Pathology, 1964
openaire   +2 more sources

Laser beam quality

Optical and Quantum Electronics, 1992
openaire   +1 more source