Effects of Pulse Duration on Laser Micro Polishing

2013 ◽  
Vol 1 (1) ◽  
Author(s):  
Madhu Vadali ◽  
Chao Ma ◽  
Neil A. Duffie ◽  
Xiaochun Li ◽  
Frank E. Pfefferkorn
Keyword(s):  
Surface Roughness ◽  
Laser Pulse ◽  
Pulse Duration ◽  
Near Infrared ◽  
Short Pulse ◽  
Laser Pulses ◽  
Laser Pulse Duration ◽  
Feature Size ◽  
Short Pulse Duration ◽  
Metallic Parts

Pulsed laser micro polishing (PLμP) has been shown to be an effective method of polishing micro metallic parts whose surface roughness can approach the feature size. Laser pulse duration in the PLμP process is an important parameter that significantly affects the achievable surface finish. This paper describes the influence of laser pulse duration on surface roughness reduction during PLμP. For this purpose, near-infrared laser pulses have been used to polish Ti6Al4V at three different pulse durations: 0.65 μs, 1.91 μs, and 3.60 μs. PLμP at longer pulse durations resulted in dominating Marangoni convective flows, yet significantly higher reductions in the average surface roughness were observed compared to the short pulse duration regime without convection.

scholarly journals Measurement of ultrashort laser ablation of four metals (Al, Cu, Ni, W) in the single-pulse regime

2020 ◽  
Vol 9 (3) ◽  
pp. 131-143
Author(s):  
Thibault Genieys ◽  
Marc Sentis ◽  
Olivier Utéza
Keyword(s):  
Pulse Duration ◽  
Ablation Threshold ◽  
Short Pulse ◽  
Scaling Law ◽  
Single Pulse ◽  
Laser Pulses ◽  
Ablation Rate ◽  
Single Shot ◽  
Pulse Regime ◽  
Short Pulse Duration

AbstractWe provide measurements of the ablation of four post-transition and transition metals [aluminum (Al), copper (Cu), nickel (Ni) and tungsten (W)] irradiated by single 800 nm laser pulses, in ultrashort regime from 100 femtosecond (fs) pulse duration down to 15 fs covering a temporal range little explored as yet. For each metal and pulse duration tested, we measured its ablation characteristics (depth and diameter) as a function of incident energy allowing us to determine its laser-induced ablation threshold and ablation rate in a single-shot regime. For all the metals studied, we observed a constant ablation threshold fluence as a function of pulse duration extending this scaling law to pulse duration of few-optical-cycles. We provide evidence of the interest of adjusting the incident fluence to maximize the energy specific ablation depth but also of the absence of any peculiar advantage related to the use of extremely short-pulse duration for ablation purposes. Those informative and detailed ablation data have been obtained in the single-pulse regime and in air ambiance. They can serve as rewarding feedback for further establishing smart strategy for femtosecond laser micromachining and laser damage handling of metallic and metal-based components as well as for enhancing accuracy of modeling of fs laser interaction with metals in ultrashort regime.

scholarly journals Influence of the Nd:YAG Laser Pulse Duration on the Temperature of Primary Enamel

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
R. A. Valério ◽  
V. S. da Cunha ◽  
R. Galo ◽  
F. A. de Lima ◽  
L. Bachmann ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Nd:Yag Laser ◽  
Short Pulse ◽  
Laser Pulse Duration ◽  
Primary Molars ◽  
Contact Mode ◽  
Temperature Changes ◽  
Thermal Changes ◽  
Long Pulse

The aim of this study is to evaluate the temperature change on specimens of primary enamel irradiated with different pulse duration of Nd:YAG laser. Fifteen sound primary molars were sectioned mesiodistally, resulting in 30 specimens (3.5 × 3.5 × 2.0 mm). Two small holes were made on the dentin surface in which K-type thermocouples were installed to evaluate thermal changes. Specimens were randomly assigned in 3 groups (n=10): A = EL (extra long pulse, 10.000 μs), B = LP (long pulse, 700 μs), and C = SP (short pulse, 350 μs). Nd:YAG laser (λ= 1.064 μm) was applied at contact mode (10 Hz, 0.8 W, 80 mJ) and energy density of 0.637 mJ/mm2. Analysis of variance (ANOVA) was performed for the statistical analysis (P=0.46). Nd:YAG laser pulse duration provided no difference on the temperature changes on primary enamel, in which the following means were observed: A = EL (23.15°C ± 7.75), B = LP (27.33°C ± 11.32), and C = SP (26.91°C ± 12.85). It can be concluded that the duration of the laser pulse Nd:YAG increased the temperature of the primary enamel but was not influenced by different pulse durations used in the irradiation.

Laser pulse duration effects in Xe2+ ions induced by multiphoton absorption at 0.53 μm

1983 ◽  
Vol 44 (11) ◽  
pp. 1247-1255 ◽  
Author(s):  
A. L'Huillier ◽  
L.A. Lompre ◽  
G. Mainfray ◽  
C. Manus
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Laser Pulse Duration ◽  
Multiphoton Absorption

Effect of laser pulse duration on properties of metal and metal carbide nanoparticles obtained by laser in liquid synthesis

2021 ◽  
Vol 138 ◽  
pp. 106916
Author(s):  
M. Curcio ◽  
A. De Bonis ◽  
A. Santagata ◽  
A. Galasso ◽  
R. Teghil
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Laser Pulse Duration ◽  
Metal Carbide

scholarly journals A laser experiment for studying radiative shocks in astrophysics

2002 ◽  
Vol 20 (2) ◽  
pp. 263-268 ◽  
Author(s):  
X. FLEURY ◽  
S. BOUQUET ◽  
C. STEHLÉ ◽  
M. KOENIG ◽  
D. BATANI ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Experimental Results ◽  
Laboratory Astrophysics ◽  
Laser Pulse Duration ◽  
Radiative Shocks ◽  
Self Similar ◽  
Laser Experiment ◽  
Similar Solutions

In this article, we present a laboratory astrophysics experiment on radiative shocks and its interpretation using simple modelization. The experiment is performed with a 100-J laser (pulse duration of about 0.5 ns) which irradiates a 1-mm3 xenon gas-filled cell. Descriptions of both the experiment and the associated diagnostics are given. The apparition of a radiation precursor in the unshocked material is evidenced from interferometry diagrams. A model including self-similar solutions and numerical ones is derived and fairly good agreements are obtained between the theoretical and the experimental results.

Ablation of transition metal oxides by different laser pulse duration and thin films deposition

2000 ◽  
Vol 154-155 ◽  
pp. 467-472 ◽  
Author(s):  
A Giardini Guidoni ◽  
C Flamini ◽  
F Varsano ◽  
M Ricci ◽  
R Teghil ◽  
...  
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Laser Pulse ◽  
Metal Oxides ◽  
Pulse Duration ◽  
Transition Metal Oxides ◽  
Laser Pulse Duration

Influences of laser pulse duration and anastomotic disruption on laser-assisted microvascular anastomoses (LAMA)

Microsurgery ◽  
1990 ◽  
Vol 11 (2) ◽  
pp. 85-90 ◽  
Author(s):  
Israel J. Jacobowitz ◽  
Su Wang ◽  
Samir Basu ◽  
F. Gregory Baumann ◽  
Corrado Marini ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Laser Pulse Duration ◽  
Anastomotic Disruption
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