Evolution of a Plume in Laser Ablation: Dependence on the Spot Size

2003 ◽  
Author(s):  
Michael Zeifman ◽  
Barbara Garrison ◽  
Leonid Zhigilei
Keyword(s):  
Laser Ablation ◽  
Spot Size

Excimer laser ablation of aluminum: influence of spot size on ablation rate

Laser Physics ◽  
2016 ◽  
Vol 26 (11) ◽  
pp. 116102 ◽  
Author(s):  
M E Shaheen ◽  
J E Gagnon ◽  
B J Fryer
Keyword(s):  
Laser Ablation ◽  
Excimer Laser ◽  
Ablation Rate ◽  
Spot Size ◽  
Excimer Laser Ablation

scholarly journals Validation of depth-profiling LA-ICP-MS in otolith applications

2017 ◽  
Vol 74 (4) ◽  
pp. 572-581 ◽  
Author(s):  
Manna L. Warburton ◽  
Malcolm R. Reid ◽  
Claudine H. Stirling ◽  
Gerry Closs
Keyword(s):  
Laser Ablation ◽  
Depth Profiling ◽  
Spot Size ◽  
Otolith Microchemistry ◽  
Concentration Data ◽  
Lag Effects ◽  
Icp Ms ◽  
Life History Patterns ◽  
Different Origins ◽  
Analytical Power

Otolith microchemistry is a widely used technique for elucidating life history patterns in fishes. This typically involves sectioning the otolith and collecting elemental signatures via laser ablation. But this requires time-intensive handling that may influence results. As an alternative to traditional cut–polish–ablate techniques, we tested depth-profiling laser ablation, which offers reduced handling and contamination risk. To validate depth profiling as a robust method for collecting trace element otolith microchemistry data, we constructed composite otoliths using otolith materials from fishes of different origins (fresh water, seawater). Test ablations were conducted on composite diadromous otoliths at a range of spot sizes and pit depths. We measured tailing and fractionation effects in the following elements: Na, Mg, K, Mn, Zn, Rb, Sr, and Ba. Given appropriate instrument parameters, depth profiling can accurately collect elemental concentration data both between and within top and bottom layers of an otolith composite across a range of spot sizes and pit depths. Analytical power and lag effects were dependent on spot size, highlighting the importance of optimizing spot size based on sample morphology and instrument parameters.

Ultrafast laser ablation ICP-MS: role of spot size, laser fluence, and repetition rate in signal intensity and elemental fractionation

2014 ◽  
Vol 29 (2) ◽  
pp. 339-346 ◽  
Author(s):  
Prasoon K. Diwakar ◽  
Jhanis J. Gonzalez ◽  
Sivanandan S. Harilal ◽  
Richard E. Russo ◽  
Ahmed Hassanein
Keyword(s):  
Laser Ablation ◽  
Laser Fluence ◽  
Repetition Rate ◽  
Signal Intensity ◽  
Spot Size ◽  
Ultrafast Laser ◽  
Elemental Fractionation ◽  
Icp Ms ◽  
Ultrafast Laser Ablation

Spot size and pulse number dependence of femtosecond laser ablation thresholds of silicon and stainless steel

2017 ◽  
Vol 396 ◽  
pp. 1736-1740 ◽  
Author(s):  
Oskar Armbruster ◽  
Aida Naghilou ◽  
Markus Kitzler ◽  
Wolfgang Kautek
Keyword(s):  
Stainless Steel ◽  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Spot Size ◽  
Pulse Number

scholarly journals Accurate analysis of Fe isotopes in Fe- dominated minerals by excimer laser ablation MC-ICP-MS on wet plasma conditions

2021 ◽  
Vol 42 (5) ◽  
Author(s):  
Honglin Yuan
Keyword(s):  
Water Vapor ◽  
Laser Ablation ◽  
Matrix Effect ◽  
Laser Fluence ◽  
Pulse Repetition Rate ◽  
Isotopic Analysis ◽  
Spot Size ◽  
Nitrogen Gas ◽  
Icp Ms

The Fe isotope ratios can be a useful tracer of geochemistry, biogeochemistry, and the environmental redox state. In this study, we investigated the feasibility of Fe isotopic analysis in Fe-dominated minerals by 193 nm excimer ns laser ablation combined with Nu Plasma 1700 high resolution MC-ICP-MS without matrix-match calibration. Several important instrument parameters were investigated, such as the effect of the addition of nitrogen gas and water vapor, the effects of analytical parameters such as ablation mode, laser fluence, pulse repetition rate, spot size on Fe isotopic mass bias during analysis were investigated as well. The results showed that the effects of ablation mode, spot size, laser pulse repetition rate, and line scan speed can be neglected, while laser fluence and matrix effects had significant influence on the Fe isotopic mass bias at dry plasma condition. These problems can be minimized using consistent lower fluence (1.5‒3.5 J·cm-2), as well as the wet plasma conditions can significantly reduce the matrix effect in Fe isotopic analysis. Fortunately, with the water vapor and nitrogen gas addition after the ablation cell, an accurate and precise Fe isotope in pyrite, manganite, hematite, and chalcopyrite analysis by ns-LA-MC-ICP-MS can be achieved with non-matrix-matched calibration. The obtained accuracy and reproducibility of the in situ determinations of δ56FeIRMM-014 were both better than ± 0.10‰ (2 SD). This study indicated that there was a serious matrix effect in the Fe isotopic analysis of Fe-dominated minerals by ns- LA-MC-ICP-MS, and nitrogen gas mixed with water vapor-assisted ns- LA-MC-ICP-MS were an appealing option for the in situ Fe isotope analysis of Fe-dominated minerals with non-matrix-matched calibration.

Amorphous Diamond Films Deposited by Pulsed-Laser Ablation: the Optimum Carbon-Ion Kinetic Energy and Effects of Laser Wavelength

1998 ◽  
Vol 526 ◽  
Author(s):  
Douglas H. Lowndes ◽  
Vladimir I. Merkulov ◽  
A. A. Puretzky ◽  
D. B. Geohegan ◽  
G. E. Jellison ◽  
...  
Keyword(s):  
Optical Properties ◽  
Laser Ablation ◽  
Kinetic Energy ◽  
Energy Gap ◽  
Spot Size ◽  
Laser Wavelength ◽  
Film Deposition ◽  
Carbon Ions ◽  
Carbon Ion ◽  
Beam Focusing

AbstractA systematic study has been made of changes in the bonding and optical properties of hydrogen-free tetrahedral amorphous carbon (ta-C) films, as a function of the kinetic energy of the incident carbon ions measured under film-deposition conditions. Ion probe measurements of the carbon ion kinetic energies produced by ArF and KrF laser ablation of graphite are compared under identical beam-focusing conditions. Much higher C+ kinetic energies are produced by ArF-laser ablation than by KrF for any given fluence and spot size. Electron energy loss spectroscopy and scanning ellipsometry measurements of the sp3 bonding fraction, plasmon energy, and optical properties reveal a well-defined optimum kinetic energy of 90 eV to deposit ta-C films having the largest sp3 fraction and the widest optical (Tauc) energy gap (equivalent to minimum near-gap optical absorption). Tapping-mode atomic force microscope measurements show that films deposited at near-optimum kinetic energy are extremely smooth, with rms roughness of only ~ 1 Å over distances of several hundred nm, and are relatively free of particulates.

Simultaneous Determination of Spot Size of Focused Laser Beam on Focal Plane and Laser-Ablation Thresholds of Samples

2014 ◽  
Vol 41 (7) ◽  
pp. 0708003 ◽  
Author(s):  
磨俊宇 Mo Junyu ◽  
陈钰琦 Chen Yuqi ◽  
周奇 Zhou Qi ◽  
李润华 Li Runhua
Keyword(s):  
Laser Ablation ◽  
Laser Beam ◽  
Simultaneous Determination ◽  
Focal Plane ◽  
Spot Size

Reflectivity and Laser Ablation Behavior of La1-xSrxTiO3+δ Coating

2017 ◽  
Vol 726 ◽  
pp. 230-234
Author(s):  
Jing Kong ◽  
Li Hong Gao ◽  
Zhuang Ma ◽  
Fu Chi Wang ◽  
Li Ao Yue
Keyword(s):  
Laser Ablation ◽  
Near Infrared ◽  
Chemical Properties ◽  
Weight Ratio ◽  
Spot Size ◽  
Atmospheric Plasma ◽  
X Ray Diffraction ◽  
Uv Visible ◽  
Physical And Chemical ◽  
And Chemical Properties

La1-xSrxTiO3+δ (LST) has been studied in many fields due to its excellent physical and chemical properties. However, there are rare reports on its optical properties, especially reflectivity. Our previous work has prepared LST coatings by atmospheric plasma spraying technique, but the reflectivity is much lower than that of LST powder itself. In this paper, LST coating was prepared by knife coating which is a traditional convenient method. The phase structure and surface morphology of the coating were examined by X-ray diffraction and scanning electron microscopy, respectively. The optical property was characterized by UV-visible-near infrared spectroscopy and the laser ablation tests were carried out by YSL-2000 Fiber Laser (IPG Co) with the wavelength of 1070 nm and the spot size of 10 mm×10 mm. Results show that the reflectivity of the LST coatings depends on the weight ratio of LST and binder. A high-reflectivity coating can be prepared by knife coating with appropriate content of LST.

Effects of irradiance and spot size on pulsed holmium laser ablation of tissue

1993 ◽  
Vol 32 (4) ◽  
pp. 569 ◽  
Author(s):  
Yacov Domankevitz ◽  
Margaret S. Lee ◽  
Norman S. Nishioka
Keyword(s):  
Laser Ablation ◽  
Spot Size ◽  
Holmium Laser
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