Effect of Laser Pulse Energy on the Structure, Morphology and Optical Properties of Tantalum-Oxide Nanoparticles Generated by Laser Ablation

2018 ◽  
Vol 13 (9) ◽  
pp. 1407-1412 ◽  
Author(s):  
Atieh Alavi ◽  
Azadeh Jafari ◽  
Sahar Heidary ◽  
Vahid Fayaz ◽  
S. A. A. Terohid
Keyword(s):  
Optical Properties ◽  
Laser Ablation ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Tantalum Oxide ◽  
Oxide Nanoparticles ◽  
Structure Morphology

Evaluation of Alternative Preparation Methods for Failure Analysis at Modern Chip and Package Technologies

2001 ◽  
Author(s):  
A. Dübotzky ◽  
B. Krüger
Keyword(s):  
Laser Ablation ◽  
Laser Pulse ◽  
Failure Analysis ◽  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Laser Pulse Energy ◽  
Preparation Methods ◽  
Silicon Thickness ◽  
Gold Wires

Abstract We evaluated laser ablation and sandblasting as preparation methods for package related failures and for backside analysis of ICs. With laser ablation we uncovered gold wedges on an internal board of a PLFBGA package without damage of the gold wires and the board metallization. This was possible by optimization of the laser pulse energy and the pulse repetition rate and by limitation of the ablation area. Sandblasting showed to be a gentle way for backside thinning down to 60 μm silicon thickness. For a surface smoothness sufficient for IR imaging a subsequent planarization treatment is necessary.

scholarly journals Effect of annealing temperature and laser pulse energy on the optical properties of CuO films prepared by pulsed laser deposition

2019 ◽  
Vol 12 (23) ◽  
pp. 97-104
Author(s):  
Kadhim A. Aadim
Keyword(s):  
Optical Properties ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Annealing Temperature ◽  
Laser Pulse Energy ◽  
Energy Gap ◽  
Optical Transmittance ◽  
Laser Deposition ◽  
Grown Film ◽  
Optical Transmittance Spectrum

In this work; copper oxide films (CuO) were fabricated by PLD. The films were analyzed by UV-VIS absorption spectra and their thickness by using profilometer. Pulsed Nd:YAG laser was used for prepared CuO thin films under O2 gas environment with varying both pulse energy and annealing temperature. The optical properties of   as-grown film such as optical transmittance spectrum, refractive index and energy gap has been measured experimentally and the effects of laser pulse energy  and annealing temperature on it were studied. An inverse relationship between energy gap and both annealing temperature and pulse energy was observed.

Surface Morphology of Silicon Induced by Laser Ablation in Flowing Water

2016 ◽  
Vol 861 ◽  
pp. 115-120 ◽  
Author(s):  
Wisan Charee ◽  
Viboon Tangwarodomnukun
Keyword(s):  
Surface Roughness ◽  
Laser Ablation ◽  
Laser Pulse ◽  
Flow Rate ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Water Flow Rate ◽  
Traverse Speed ◽  
Flowing Water ◽  
Cut Surface

Underwater laser machining process has a high potential over the typical laser ablation to remove materials with less thermal damage occurring along the cut. However, the formations of vapor bubble and cut debris in water can substantially disturb the incident laser beam, thereby reducing the ablation performance. Instead of performing the ablation in still water, the flowing water technique was applied to flush away the cut debris and bubble generated. In this study, the effects of laser pulse energy, traverse speed and water flow rate on the cut surface roughness and heat-affected zone in the laser grooving of silicon were experimentally investigated and analyzed. The findings revealed that the cut surface roughness decreased with the increases in laser pulse energy and laser traverse speed. Though a higher water flow rate resulted in a rougher cut surface, the heat-affected zone can be minimized when the increased flow rate was applied.

scholarly journals Effects of Laser Pulse Energy and Annealing Process on Physical Properties of Nanostructured SiO2 Prepared by Pulse Laser Deposition

2015 ◽  
Vol 59 ◽  
pp. 35-45
Author(s):  
Jafer Fahdel Odah
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Laser Pulse ◽  
Pulse Laser Deposition ◽  
Pulse Energy ◽  
Annealing Temperature ◽  
Laser Pulse Energy ◽  
Laser Deposition ◽  
Transmission Spectra ◽  
Before And After

Silicon dioxide thin film of different thicknesses has been grown on glass substrate by pulsed laser deposition technique with and without annealing temperature under the vacuum pressure of 8×10-2 mbar. The optical properties such as the absorption, and transmission spectra have been studied for the prepared SiO2 thin film before and after annealing temperature. From the transmission spectra, the optical gap and linear refractive index of the SiO2 thin film was determined. The structure of the SiO2 thin film was tested with X-Ray diffraction, it was formed to be amorphous structure before annealing temperature. The effects of laser pulse energy on the optical properties has been studied before and after annealing temperature. It is found that almost optical properties depends on the laser pulse energy and increases with increasing laser pulse energy and they are enhanced with the annealing temperature. Keywords: SiO2 thin film, pulse laser deposition, annealing temperature.

Effect of Laser Pulse Energy on the Characteristics of Cu Nanoparticles Produced by Laser Ablation Method in Acetone

2014 ◽  
Vol 25 (4) ◽  
pp. 1147-1156 ◽  
Author(s):  
Davoud Dorranian ◽  
Seyedeh Arezoo Ahmadi Afshar ◽  
Negar Tahmasebi ◽  
Atefeh Fotovat Eskandari
Keyword(s):  
Laser Ablation ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Cu Nanoparticles ◽  
Laser Ablation Method
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