Effect of laser beam shape parameters on photothermal deflection densitometers

Orientating manipulations of cylindrical particles were performed by optical tweezers. Vertical and horizontal manipulations of Escherichia coli (E. coli) were carried out by changing the trapping depth and the focused laser beam shape. It was found that carbon nanotubes bundles (CNTBs) could be rotated in the linear polarized optical trap until it orientated its long axis along the linear polarization direction of the laser beam. However, E.coli could not be orientated in this way. Corresponding mechanisms were discussed based on the anisomeric electric characters of CNTBs. These orientation technologies of cylindrical objects with optical trap have potential applications in assembling nano-electric devices.

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Dynamic control of laser beam shape for heat treatment

Journal of Laser Applications ◽

10.2351/1.5040647 ◽

2018 ◽

Vol 30 (3) ◽

pp. 032507 ◽

Cited By ~ 6

Author(s):

Paula Sancho ◽

M. Angeles Montealegre ◽

Jesús Dominguez ◽

Piera Alvarez ◽

Juan Isaza

Keyword(s):

Heat Treatment ◽

Laser Beam ◽

Dynamic Control ◽

Beam Shape

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Influence of Excimer Laser Beam Shape on Poly-Si Crystallisation

Japanese Journal of Applied Physics ◽

10.1143/jjap.43.5114 ◽

2004 ◽

Vol 43 (8A) ◽

pp. 5114-5121 ◽

Cited By ~ 10

Author(s):

S. D. Brotherton ◽

D. J. McCulloch ◽

J. P. Gowers

Keyword(s):

Laser Beam ◽

Excimer Laser ◽

Beam Shape

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Laser beam shape and curvature radius of the laser wavefront passing through ZnO nanostructures

Physica E Low-dimensional Systems and Nanostructures ◽

10.1016/j.physe.2010.11.016 ◽

2012 ◽

Vol 44 (6) ◽

pp. 1066-1070 ◽

Cited By ~ 3

Author(s):

S.H. Mousavi ◽

H. Haratizadeh

Keyword(s):

Laser Beam ◽

Curvature Radius ◽

Zno Nanostructures ◽

Beam Shape

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Linear-core-array optical fiber based laser beam shape convertor

10.1117/12.884726 ◽

2011 ◽

Author(s):

Libo Yuan ◽

Xiaoliang Zhu ◽

Ai Zhou ◽

Qiang Dai ◽

Fengjun Tian

Keyword(s):

Laser Beam ◽

Optical Fiber ◽

Beam Shape

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The effect of object shape and laser beam shape on lidar system resolution

10.1117/12.2225197 ◽

2016 ◽

Author(s):

Hongchang Cheng ◽

Jingyi Wang ◽

Jun Ke

Keyword(s):

Laser Beam ◽

Lidar System ◽

Beam Shape ◽

Object Shape

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Study on Macroscopic Morphology and Microstructure of Single Ni60 Laser Clad Tracks Prepared Using a Variable Laser Beam Shaper

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.887-888.1091 ◽

2014 ◽

Vol 887-888 ◽

pp. 1091-1095

Author(s):

You Zheng Sun ◽

Si Yu Wang ◽

Daniel Wellburn ◽

Shuo Shang ◽

Jian Cheng ◽

...

Keyword(s):

Temperature Distribution ◽

Laser Beam ◽

Cross Section ◽

Steel Industry ◽

Alloy Powder ◽

Low Energy ◽

Beam Shape ◽

Cross Section Area ◽

Section Area ◽

Density Ratios

The objective of the present study was to find the influence of laser beam shape on macroscopic morphology and microstructure of single Ni60 laser clad tracks. Laser cladding of Ni60 alloy powder can be used to manufacture and remanufacture backup rollers for the steel industry. Controlling temperature distribution can assist with achieving favorable macroscopic morphology and microstructure. Five different beam profiles were used in our experiment to prepare clad tracks. The beam profiles varied in terms of the ratio of energy densities between the internal and external parts. The macroscopic morphology and microstructure was tested using SEM. The study founds decreasing the ratio is possible to achieve wider clad tracks with a larger cross section area. It was found that microstructure in upper region tended to form net-like dendrite microstructure at low energy density ratios.

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