Advanced laser optics for laser material processing

Ebata, Keiji; Fuse, Keiji; Hirai, Takayuki; Kurisu, Kenichi

doi:10.1117/12.541164

Cited by 4 publications

(3 citation statements)

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“…Flat-top laser are well known to present significant advantages for laser technology, such as holographic recording system, Z-scan measurement, laser heat treatment and surface annealing in microelectronics and various nonlinear optical processes [15][16][17][18][19]. For CW beams, several approaches to spatially shape Gaussian beams have been developed, such as the use of aspheric lenses, implement beam shaping or the use of diffractive optical devices [20].…”

Section: Fluidic Laser Beam Shapermentioning

confidence: 99%

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Fluidic Optical Devices Based on Thermal Lens Effect

Hong¹,

Fushinobu²

2012

Optical Devices in Communication and Computation

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Section: Fluidic Laser Beam Shapermentioning

confidence: 99%

“…The variable n is the refractive index of the liquid sample. The variable n is the refractive index profile depending on medium temperature following equation (13)(14)(15)(16)18). …”

Section: Principle Of Fluidic Lensmentioning

confidence: 99%

Fluidic Optical Devices Based on Thermal Lens Effect

Hong¹,

Fushinobu²

2012

Optical Devices in Communication and Computation

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“…The proposed welding configuration is similar to those put forth in this research; however, no experimental results and no details-such as diffractive design algorithms, power levels, efficiencies, and fidelities-were provided. Other researchers have also used DOEs in material processing for beam homogenizing 22 to enhance manufacturing performance.…”

Section: Introductionmentioning

confidence: 99%

Diffractive optics as beam-shaping elements for plastics laser welding

Grewell

Benatar

2007

Opt. Eng

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Abstract. This work reviews the use of diffractive optics for beamshaping of high-power lasers ͑50-100 W͒ for welding and microwelding of plastics. While the use of lasers to weld plastics is well known, the use of diffractive optics to reshape lasers for welding of plastics has not been previously reported. By using inverse Fourier transformations diffractive lenses were designed and fabricated. An 80 W fiber laser with a wavelength of 1084 nm was coupled in air to the diffractive optical element ͑DOE͒ to shape the beam into predetermined patterns. These patterns were then reduced with standard optics to a desired size. Weld quality was assessed in terms of fidelity and replication of the original bitmap image that was used to design the DOE. Good results were obtained for both image fidelity and replication. In many cases the weld image retained the individual bitmap elements of the original artwork used to encode the DOE. It was also found that the overall efficiencies of the system were as high as 59% and weld times were less than 1 s. Weld joints were also determined to be relatively strong and weld circles as small as a few hundreds of m in diameter could be formed.

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Beam Shaping for Advanced Laser Materials Processing

Fuse

2015

Laser Technik Journal

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For recent industrial materials processing with advanced high power lasers, beam shaping optics are utilized as a key technology. Aspheric or diffractive beam shapers transform a Gaussian intensity profile of a single mode (TEM00) laser beam into a flattop one. While an aspheric beam shaper can make a circular flattop, a diffractive one can realize much flexibility in output beam shapes, like square, rectangular, linear, or other complex beam shapes. The beam shaping is often combined with a scanning optical system, consisting of galvanometric mirrors and an f‐theta lens. Those beam shapers are used for either pulsed or CW single mode laser applications, i. e. ablation, cutting, drilling, scribing, annealing, etc. of thin films or bulk materials. This article describes principles, design concepts and specification examples of those optical systems used in practical applications.

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Advanced laser optics for laser material processing

Cited by 4 publications

References 0 publications

Fluidic Optical Devices Based on Thermal Lens Effect

Fluidic Optical Devices Based on Thermal Lens Effect

Diffractive optics as beam-shaping elements for plastics laser welding

Beam Shaping for Advanced Laser Materials Processing

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