Thermal self-action of an annular laser beam in A soot-particle aerosol

1984 ◽  
Vol 5 (2) ◽  
pp. 292-294
Author(s):  
Yu. N. Grachev ◽  
G. M. Strelkov
Keyword(s):  
Laser Beam ◽  
Soot Particle ◽  
Annular Laser

scholarly journals Study of an annular laser beam based axially-fed powder cladding process

CIRP Annals ◽  
2018 ◽  
Vol 67 (1) ◽  
pp. 241-244 ◽  
Author(s):  
Edvard Govekar ◽  
Andrej Jeromen ◽  
Alexander Kuznetsov ◽  
Gideon Levy ◽  
Makoto Fujishima
Keyword(s):  
Laser Beam ◽  
Annular Laser

Filamentation of an annular laser beam with a vortex phase dislocation in fused silica

2016 ◽  
Vol 46 (11) ◽  
pp. 1002-1008 ◽  
Author(s):  
E V Vasil'ev ◽  
S A Shlenov
Keyword(s):  
Laser Beam ◽  
Fused Silica ◽  
Vortex Phase ◽  
Annular Laser

scholarly journals Collection efficiency of the soot-particle aerosol mass spectrometer (SP-AMS) for internally mixed particulate black carbon

2014 ◽  
Vol 7 (12) ◽  
pp. 4507-4516 ◽  
Author(s):  
M. D. Willis ◽  
A. K. Y. Lee ◽  
T. B. Onasch ◽  
E. C. Fortner ◽  
L. R. Williams ◽  
...  
Keyword(s):  
Laser Beam ◽  
Black Carbon ◽  
Mass Spectrometer ◽  
Soot Particle ◽  
Collection Efficiency ◽  
Particle Beam ◽  
Aerosol Mass Spectrometer ◽  
Coated Particles ◽  
Aerosol Mass ◽  
Wide Range

Abstract. The soot-particle aerosol mass spectrometer (SP-AMS) uses an intra-cavity infrared laser to vaporize refractory black carbon (rBC) containing particles, making the particle beam–laser beam overlap critical in determining the collection efficiency (CE) for rBC and associated non-refractory particulate matter (NR-PM). This work evaluates the ability of the SP-AMS to quantify rBC and NR-PM mass in internally mixed particles with different thicknesses of organic coating. Using apparent relative ionization efficiencies for uncoated and thickly coated rBC particles, we report measurements of SP-AMS sensitivity to NR-PM and rBC, for Regal Black, the recommended particulate calibration material. Beam width probe (BWP) measurements are used to illustrate an increase in sensitivity for highly coated particles due to narrowing of the particle beam, which enhances the CE of the SP-AMS by increasing the laser beam–particle beam overlap. Assuming complete overlap for thick coatings, we estimate CE for bare Regal Black particles of 0.6 ± 0.1, which suggests that previously measured SP-AMS sensitivities to Regal Black were underestimated by up to a factor of 2. The efficacy of the BWP measurements is highlighted by studies at a busy road in downtown Toronto and at a non-roadside location, which show particle beam widths similar to, but greater than that of bare Regal Black and coated Regal Black, respectively. Further BWP measurements at field locations will help to constrain the range of CE for fresh and aged rBC-containing particles. The ability of the SP-AMS to quantitatively assess the composition of internally mixed particles is validated through measurements of laboratory-generated organic coated particles, which demonstrate that the SP-AMS can quantify rBC and NR-PM over a wide range of particle compositions and rBC core sizes.

Simulations of the Near-Field Enhancement on AFM Tip Irradiated by Annular Laser Beam

2019 ◽  
Vol 18 ◽  
pp. 979-982
Author(s):  
Xiwen Lu ◽  
Lijun Yang ◽  
Hui Xie ◽  
Zhan Yang ◽  
Jianlei Cui ◽  
...  
Keyword(s):  
Laser Beam ◽  
Near Field ◽  
Field Enhancement ◽  
Annular Laser

Temperature distributions due to annular laser beam heating

2005 ◽  
Vol 17 (4) ◽  
pp. 256-262 ◽  
Author(s):  
D. Zeng ◽  
W. P. Latham ◽  
A. Kar
Keyword(s):  
Laser Beam ◽  
Temperature Distributions ◽  
Beam Heating ◽  
Laser Beam Heating ◽  
Annular Laser

Diffractive elements for annular laser beam transformation

1992 ◽  
Vol 61 (4) ◽  
pp. 381-383 ◽  
Author(s):  
N. Davidson ◽  
A. A. Friesem ◽  
E. Hasman
Keyword(s):  
Laser Beam ◽  
Annular Laser

High-order harmonic generation with an annular laser beam

1994 ◽  
Vol 19 (13) ◽  
pp. 942 ◽  
Author(s):  
J. Peatross ◽  
J. L. Chaloupka ◽  
D. D. Meyerhofer
Keyword(s):  
Laser Beam ◽  
Harmonic Generation ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic ◽  
Annular Laser
Sign in / Sign up

Export Citation Format

Share Document