Patent
Gaussian beam profile shaping apparatus, method therefor and evaluation thereof
TLDR
In this paper, a phase element is selected in accordance with a dimensionless parameter which is dependent upon the radius of the incoming beam, the desired spot shape, the focal length of the lens and the wavelength of the input beam.Abstract:
A method and apparatus maps a Gaussian beam into a beam with a uniform irradiance profile by exploiting the Fourier transform properties of lenses. A phase element imparts a design phase onto an input beam and the output optical field from a lens is then the Fourier transform of the input beam and the phase function from the phase element. The phase element is selected in accordance with a dimensionless parameter which is dependent upon the radius of the incoming beam, the desired spot shape, the focal length of the lens and the wavelength of the input beam. This dimensionless parameter can also be used to evaluate the quality of a system. In order to control the radius of the incoming beam, optics such as a telescope can be employed. The size of the target spot and the focal length can be altered by exchanging the transform lens, but the dimensionless parameter will remain the same. The quality of the system, and hence the value of the dimensionless parameter, can be altered by exchanging the phase element. The dimensionless parameter provides design guidance, system evaluation, and indication as to how to improve a given system.read more
Citations
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Patent
Energy efficient, laser-based method and system for processing target material
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Patent
Beam shaping and projection imaging with solid state uv gaussian beam to form vias
Corey M. Dunsky,Xinbing Liu,Nicholas J. Croglio,Ho Wai Lo,Bryan C. Gundrum,Hisashi Matsumoto +5 more
TL;DR: In this article, a diode-pumped solid-state laser (52) of a laser system (50) provides ultraviolet Gaussian output (54) that is converted by a diffractive optical element (90) into shaped output (94) having a uniform irradiance profile.
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TL;DR: In this paper, a laser irradiation apparatus for homogenously crystallized films is described, where the energy intensity of an irradiation beam in forward and backward directions of the irradiation is varied in accordance with the scanning direction.
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High numerical aperture optical focusing device for use in data storage systems
TL;DR: In this article, a near-field optical or MO data storage system uses an optical focusing device for focusing an incident optical beam to a small size focal spot, which is located along a central axis P, in very close proximity to the data storage disk, such that the localized evanescent field interacts with the disk, enabling data to be transduced to and from the disk by effecting near field coupling.
References
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PatentDOI
Geometrical transformations in optics
TL;DR: In this paper, the authors introduce phase filters having a predetermined phase function into optical coherent systems in such a manner that the local phase variations influence light from local object areas, where the object distribution is multiplied by the phase function so that its spectrum at the frequency plane constitutes the desired transformation.
Patent
Optical beam homogenizer
TL;DR: An optical beam homogenizer divides and redirects an incident beam to provide uniform irradiation to a plane surface as mentioned in this paper, which is useful for metal hardening, semiconductor annealing, or other materials processing applications.
Journal ArticleDOI
Kinoform phase plates for focal plane irradiance profile control.
TL;DR: A versatile, rapidly convergent, iterative algorithm is presented for the construction of kinoform phase plates for tailoring the far-field intensity distribution of laser beams that contains more than 95% of the incident energy inside a desired region and is relatively insensitive to beam aberrations.
Patent
Apparatus for heat treating a surface
TL;DR: In this paper, a flat beam intensity profile is obtained by dithering (spacially oscillating) the beam continuously as it sweeps the metal surface, and the intensity profile across the dithered beam can be tailored and is dependent upon the initial beam intensity profiles and the configuration of the dither.
Journal ArticleDOI
Laser beam profile shaping with interlaced binary diffraction gratings.
TL;DR: A new CO(2) laser beam profile shaper was designed and tested, with high-power efficiency, that transforms a fundamental mode laserbeam profile into a flattop profile at a focal plane.