Pulse shaping effects on weld porosity in laser beam spot welds : contrast of long- & short- pulse welds.

A laser line generator projects a straight line on an object and is widely used for alignment, identification, barcode reading, etc. Conventional laser line generators make use of cylindrical and Powell lenses that convert a laser beam spot into a line. Because of a fixed fan angle, however, the length and brightness of the generated line depends on the working distance between the laser module and object. In this project, using the optical system design software Zemax and engineering CAD software Solidworks, a micromirror based laser line generator is designed and fabricated. The performance of the fabricated micromirror based laser line generator is tested and compared with the performance of a conventional laser line generator. The results show that the length and brightness of image line can be kept constant by the designed generator.

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Measurement of focal length based on laser-beam-spot tracking system using diffractive beam sampler

Measurement ◽

10.1016/j.measurement.2018.03.011 ◽

2018 ◽

Vol 122 ◽

pp. 135-140 ◽

Cited By ~ 1

Author(s):

Binh Xuan Cao ◽

Phuong Le Hoang ◽

Sanghoon Ahn ◽

Jeng-o Kim ◽

Heeshin Kang ◽

...

Keyword(s):

Laser Beam ◽

Focal Length ◽

Tracking System ◽

Beam Spot

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Effect of Laser Beam Spot Size on the Dynamics of Ultrashort Laser-Produced Plasma In Vacuum

10.1109/icops35962.2018.9575849 ◽

2018 ◽

Author(s):

Pranitha Sankar ◽

H.D. Shashikala ◽

S. S. Harilal ◽

Reji Philip

Keyword(s):

Laser Beam ◽

Spot Size ◽

Beam Spot ◽

Beam Spot Size ◽

Laser Produced Plasma ◽

Ultrashort Laser

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Effects of pulse shaping on Nd:YAG laser spot welds in an AZ31 magnesium alloy

Optics and Lasers in Engineering ◽

10.1016/j.optlaseng.2019.02.002 ◽

2019 ◽

Vol 119 ◽

pp. 1-8 ◽

Cited By ~ 6

Author(s):

Xiaobin Zhang ◽

Zhanyi Cao

Keyword(s):

Magnesium Alloy ◽

Nd:Yag Laser ◽

Pulse Shaping ◽

Az31 Magnesium Alloy ◽

Laser Spot ◽

Spot Welds

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Dynamics of UV short pulse laser-induced plasmas from a ceramic material “titanium carbide”: a hydrodynamical out of equilibrium investigation

Laser and Particle Beams ◽

10.1017/s0263034619000168 ◽

2019 ◽

Vol 37 (01) ◽

pp. 86-100

Author(s):

A. Ait Oumeziane ◽

J-D. Parisse

Keyword(s):

Laser Beam ◽

Ceramic Material ◽

Material Properties ◽

Atmospheric Pressure ◽

Short Pulse ◽

Plume Expansion ◽

Pure Material ◽

Short Pulse Laser ◽

Helium Gas ◽

Ionization Rates

AbstractThe present work is motivated by the numerous applications of short lasers–ceramics interaction. It aims at applying a newly developed model to investigate the dynamic of laser-induced plasmas from a ceramic material into a helium gas under atmospheric pressure. To have a better understanding of the link between the material properties, the plume characteristics and its interaction with the laser beam, a thorough examination of the entire ablation processes is conducted. Comparison with the behavior of laser-induced plumes under the same conditions from a pure material is shown to have a key role in shedding the light on what monitors the plume expansion in the background environment. Plume temperatures, velocities, ionization rates as well as elemental composition have been presented and compared under carefully chosen relevant conditions. This study is of interest for laser matter applications depending on the induced plasmas dynamics and composition.

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