Multi-Beam Laser Plotter For Glass Plates

1989 ◽  
Author(s):  
Akira Kuwabara ◽  
Koji Ozaki ◽  
Takumi Yoshida
Keyword(s):  
Beam Laser ◽  
Glass Plates

Structural and Electrical Characterization of Shaped Beam Laser Recrystallized Polysilicon on Amorphous Substrates

1981 ◽  
Vol 4 ◽  
Author(s):  
T. J. Stultz ◽  
J. F. Gibbons
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Grain Structure ◽  
Electrical Characteristics ◽  
Shaped Beam ◽  
Beam Laser ◽  
Cw Laser ◽  
Amorphous Substrates ◽  
Circular Beam

ABSTRACTStructural and electrical characterization of laser recrystallized LPCVD silicon films on amorphous substrates using a shaped cw laser beam have been performed. In comparing the results to data obtained using a circular beam, it was found that a significant increase in grain size can be achieved and that the surface morphology of the shaped beam recrystallized material was much smoother. It was also found that whereas circular beam recrystallized material has a random grain structure, shaped beam material is highly oriented with a <100> texture. Finally the electrical characteristics of the recrystallized film were very good when measured in directions parallel to the grain boundaries.

Conduction cooled narrow linewidth sub-nanosecond multi-beam laser

2021 ◽  
Vol 17 (9) ◽  
pp. 518-522
Author(s):  
Yong Cheng ◽  
Chaoyong Tan ◽  
Xu Liu ◽  
Xia Chen ◽  
Mengzhen Zhu ◽  
...  
Keyword(s):  
Narrow Linewidth ◽  
Beam Laser

scholarly journals Parametric Studies of a Mercury-Free DBD Lamp

Plasma ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 82-93
Author(s):  
Bruno Caillier ◽  
Laurent Therese ◽  
Philippe Belenguer ◽  
Philippe Guillot
Keyword(s):  
Indium Tin Oxide ◽  
High Efficiency ◽  
Barrier Discharge ◽  
Necessary Conditions ◽  
Electrical Signal ◽  
Major Interest ◽  
Xenon Mixture ◽  
Parametric Studies ◽  
Glass Plates ◽  
Alternative Solutions

Mercury discharge lamps are often used because of their high efficiency; however, the usage of mercury lamps will be restricted or forbidden for safety and environmental purposes. Finding alternative solutions to suppress mercury is of major interest. The aim of this work is to increase the luminous efficacy of a commercial-free mercury flat dielectric barrier discharge lamp (Planilum, St Gobain) in order to reach the necessary conditions for the lamp to be used as a daily lighting source. The lamp is made of two glass plates separated by a gap of 2 mm. The gap is filled by a neon xenon mixture. The external electrodes made of transparent ITO (indium tin oxide) are deposited on the lamp glass plates. The electrical signal applied to the electrodes generates a UV-emitting plasma inside the gap. Phosphors deposited on the glass allow the production of visible light. The original electrode geometry is plane-to-plane; this induces filamentary discharges. We show that changing the plane-to-plane geometry to a coplanar geometry allows the plasma to spread all over the electrode surface, and we can reach twice the efficacy of the lamp (32 lm/W) as compared to the original value. Using this new electrode geometrical configuration and changing the electrical signal from sinusoidal to a pulsed signal greatly improves the visual uniformity of the emitted light all over the lamp. Electrical and optical parametric measurements were performed to study the lamp characteristics. We show that it is possible to develop a free mercury lamp with an efficacy compatible with lighting purposes.

Elimination of blind zone in nanoparticle removal on silicon wafers using a double-beam laser shockwave cleaning process

2021 ◽  
Vol 539 ◽  
pp. 148057
Author(s):  
Shuowen Zhang ◽  
Qingyu Yan ◽  
Jian Lin ◽  
Qunli Zhang ◽  
Yongfeng Lu ◽  
...  
Keyword(s):  
Silicon Wafers ◽  
Cleaning Process ◽  
Blind Zone ◽  
Beam Laser ◽  
Double Beam ◽  
Nanoparticle Removal

scholarly journals Magnetic-Measuring Square in the Measurement of the Circular Curve of Rail Transport Tracks

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 560 ◽  
Author(s):  
Arkadiusz Kampczyk
Keyword(s):  
Operating Mode ◽  
Laser Wavelength ◽  
Rail Transport ◽  
Railway Track ◽  
Actual Condition ◽  
Measuring Device ◽  
Beam Laser ◽  
Magnetic Measuring ◽  
Measurement Results ◽  
Circular Curve

In rail transport, measuring the actual condition of a circular curve of a railway track is a key element of track position monitoring not only during operation but also during final works. Predicting changes in its position in the horizontal plane is one of the most important related scientific issues. This paper presents the results of measurements performed with an innovative measuring device called the Magnetic-Measuring Square (MMS). The aim of the research was to demonstrate the acceptability of using the MMS. Horizontal versines of a rail track curve were measured as three neighboring points on a curve (using the method of lacing/stringlining, also called the three-point or the Hallade method), and the perpendicularity of rail joints and shortenings were measured. The MMS device presented in this article was used to measure versines and differences in rails lengths (rail shortenings in the curve) in the operating mode involving a laser distance meter with a laser beam (laser power P < 1 mW, laser wavelength λ = 635 nm) with a target cross, a camera, and a surveying measuring disk. The measurement results confirmed that it is possible to employ the MMS to monitor the geometry of railway track fragments such as track transition curves and railway track curves in rail transport.

Method of measuring the refractive index of glass plates

1990 ◽  
Vol 33 (8) ◽  
pp. 803-808 ◽  
Author(s):  
Yu. V. Mishchenko
Keyword(s):  
Refractive Index ◽  
Glass Plates
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