...Mohammad Hendijanifard; David A. Willis Laser micromachining of an aluminum film on a glass substrate is investigated using a time-resolved transmission imaging technique with nanosecond resolution. Micromachining is performed using a 7 ns pulse-width Nd:YAG laser operating at the 1064 nm...

...M. A. Aweda; M. Agida; M. Dada; O. B. Awojoyogbe; K. Isah; O. P. Faromika; K. Ben Mahmoud Boubaker; K. De; O. S. Ojambati In this study, an analytical solution to the heat transfer equation in biological tissues during laser heating is presented. The results were compared to recently published...

...Heng Pan; Seung H. Ko; Costas P. Grigoropoulos Molecular dynamics (MD) simulations were employed to investigate the mechanism and kinetics of the solid-state sintering of two crystalline gold nanoparticles ( 4.4 – 10.0 nm ) induced by low energy laser heating. At low temperature ( 300 K...

...Yuwen Zhang; J. K. Chen An interfacial tracking method was developed to model rapid melting and resolidification of a freestanding metal film subject to an ultrashort laser pulse. The laser energy was deposited to the electrons near thin film surface, and subsequently diffused into a deeper part...

... laser pyrolysis Advanced composites are a material in which two (or more) constituents are engineered to produce properties that would not be attained by conventional means ( 1 ). Laser machining offers the advantages of high machining rates, no tool wear, no contact forces, and relatively high...

... heating by a picosecond laser impulse. Results are compared with the classical solution of the parabolic heat transfer equation and available experimental data. Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER . Manuscript received by the Heat Transfer...

...Xinwei Wang Thermal and thermomechanical phenomena in laser metal interaction are of great importance in terms of understanding the underlying mechanisms in laser materials processing, optimizing the efficiency of laser micro-machining, and minimizing laser induced damage. In this work, Molecular...

...V. M. Salazar; J. E. Gonza´lez; L. A. Rivera This work presents the use of laser induced fluorescence for instantaneous temperature measurements of 200 μm water droplets in a monodisperse stream while traveling downward in a standard stagnant atmosphere. The droplets are doped with small...

... locations within the medium. The incident radiant energy due to a short laser pulse produces a highly transient and unique transmittance, which is investigated. The discrete wavelets method is used to solve the corresponding equation of transient radiative transfer. The time dependent transmittance...

...Xinwei Wang; Xianfan Xu In this work, Molecular Dynamics simulations are conducted to attain thermal and mechanical characteristics of nanoparticles formed in laser materials interaction. It reveals that nanoparticles originate from intense vapor phase explosion. A gas-like structure is observed...

...; revision received May 16, 2003. Associate Editor: S. T. Thynell. 10 January 2003 16 May 2003 23 09 2003 heat radiation Heat Transfer Laser Numerical Methods Participating Media Radiation The zonal method, originally developed by Hottel and Cohen 1...

...Yuwen Zhang Numerical analysis of laser chemical vapor deposition (LCVD) of titanium nitride by a moving laser beam is presented. The effect of natural convection due to temperature and concentration differences in the gaseous mixture is modeled and implemented into thermal model of LCVD...

...) undergoing laser-assisted machining (LAM). The pyrometer operates in a waveband between 11 and 14 μm, and a detailed description of measurement uncertainties is provided. The largest uncertainties relate to knowledge of the surface emissivity and the large temperature gradients generated by the LAM process...

...Xianfan Xu; David A. Willis Materials processing using high power pulsed lasers involves complex phenomena including rapid heating, superheating of the laser-melted material, rapid nucleation, and phase explosion. With a heating rate on the order of 10 9 K / s or higher, the surface layer melted...

.... Pulsed laser-effected melting and recrystallization is exceptionally effective since it avoids damage to the underlying insulator structure. The ensuing phase transformations and ultimately the quality of the produced p-Si material strongly depend on the temperature history. This article presents...

... devices, biomedical and bioengineering systems, multilayer thin film coatings, fiber optics, etc. Micromachining dielectrics using ultrafast lasers is an exciting and promising new research area with many significant advantages, including precision material removal, negligible heating of the workpiece...

...Z. M. Zhang and; D. H. Chen Two-photon absorption in volume-absorbing materials may be significant for high-power, short-pulse excimer laser irradiation. In the present work, the effects of two-photon absorption on the laser intensity propagation and the penetration depth are investigated...

...Xinwei Wang; Xianfan Xu In this work, heat transfer and phase change of an argon crystal irradiated by a picosecond pulsed laser are investigated using molecular dynamics simulations. The result reveals no clear interface when phase change occurs, but a transition region where the crystal structure...

...James W. Rogers; Leslie M. Phinney Due to the small component sizes in modern microdevices, surface forces can create undesirable adhesion between microstructures, which is referred to as stiction. The current study uses a 100 ns, 1064 nm, Nd:YAG laser to repair polycrystalline silicon...

... (thin film) under pulsed laser heating, and relating these changes to the corresponding surface temperature variations. Analytical solutions of the diffusion problem are then used to determine the thermal conductivity of the material following an iterative matching process between the solutions...