Results 251 to 260 of about 2,360,851 (277)

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
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Application of Spiral Laser Beams for Beam Shaping Problem

2006 International Workshop on Laser and Fiber-Optical Networks Modeling, 2006
Spiral beams are paraxial structurally stable rotating wavefields. For any planar curve there are such spiral beams, whose intensity shape is similar to the curve. The usage of Gerchberg?Saxton iterative algorithm and the initial data, based on spiral beam theory, provide an effective way for construction of specific vortical phase elements.
E.G. Abramochkin, E.V. Razueva, V.G. Volostnikov   +2 more
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Beam Shaping Of Powerful Lasers

SPIE Proceedings, 1989
Apodized (soft) apertures(AA) of 2-50 mm diameter with the near-Gaussian and the flat top spatial profiles in ultraviolet, visible and infrared regions are presented. They have the high thresholds for intensity damage.
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Laser Beam Shaping Applications

2017
Preface Illuminators for Microlithography, Paul Michaloski Laser Beam Shaping in Array-Type Laser Printing Systems, Andrew F. Kurtz and Daniel D. Haas Practical UV Excimer Laser Image System Illuminators, Jeffrey P. Sercel and Michael von Dadelszen Beam Shaping for Optical Data Storage, Edwin P. Walker and Tom D.
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Hazard analysis on gaussian shaped laser beams

American Industrial Hygiene Association Journal, 1980
Laser safety evaluations are usually difficult for those who do not perform these evaluations every day. The author develops formulae for hazard evaluation based on a Gaussian beam shape. These formulae may be applied to a variety of situations even though an electronic calculator usually is required to solve them.
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Diffractive shaping of excimer laser beams

Journal of Modern Optics, 2000
Abstract We address the problem of shaping the intensity distribution of a highly directional partially coherent field, such as an excimer laser beam, by means of diffractive optics. Our theoretical analysis is based on modelling the multi-transverse-mode laser beam as a Gaussian Schell-model beam. It is shown numerically that a periodic element, which
J. Turunen, P. Pääkkönen, M. Kuittinen, P. Laakkonen, J. Simonen, T. Kajava, M. Kaivola   +6 more
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Non-paraxial laser beam shaping

SPIE Proceedings, 2004
The reshaping of laser beams to intensity distributions with high homogeneity is of practical interest for a lot of applications. Often the generation of intensity distributions with high resolution, very small or large diameters is of practical interest. These intensities correspond typically with waves with high divergence angles.
Hagen Schimmel, Frank Wyrowski
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Gaussian laser beam profile shaping

Optical Engineering, 1996
A method for converting single-mode Gaussian beams into beams with uniform irradiance profiles is described. The design is based on a Fourier transform relation between the input and output beam functions. The efficacy of the solution is shown to depend on a parameter that contains the product of the widths of the input and output beams.
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Theory and techniques for laser beam shaping

ICALEO 2001: Proceedings of the Laser Materials Processing Conference and Laser Microfabrication Conference, 2001
Many basic experiments as well as industrial and military applications require laser beams that have specified shape or irradiance profile. A common requirement is a laser profile that is uniform over some cross-section. Such applications include laser/material processing, laser material interaction studies, fiber injection systems, optical data/image ...
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Laser beam shaping: properties and applications

2020
The field of laser beam shaping advances the study of optics by pushing the limits of structured light and its applications. This thesis aims to exploit classical optical theory using state of the art structuring techniques to introduce two novel demonstrations: (1) high-speed digital micro-mirror device (DMD) light shaping and (2) broadband dual ...
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