Percussion Drilling Hole in Cu, Al, Ti and Ni Alloys Using Ultra-Short Pulsed Laser Ablation

Micro Drilling Simulation of Ultra-Short Pulsed Laser Ablation of Glass

Ablation and Separation of Dermis via Ultra-short Pulsed Laser

Dermal tissue ablation and layer-separation with minimal thermal damage to the surrounding tissue via an ultra-short pulsed (USP) laser has been investigated. At first, a parametric study for wet tissue surface line ablation was investigated. The line features were measured by both microscope and scanning electron microscopy. The dermis ablation threshold and the incubation factor were determin...

Residual Heat in Ultra-Short Pulsed Laser Ablation of Metals

In ultra-short pulsed laser ablation of metals, a considerable amount of the incident laser energy remains in the workpiece as residual heat. When using high repetition rates, this can cause severe damage due to heat accumulation effects. In this paper, the amount and the spatial distribution of the residual heat deposited by a spatially Gaussian-shaped laser pulse are investigated by means of ...

Elastic constants of bcc Cu-Al-Ni alloys.

We have measured the adiabatic elastic constants of two Cu-Al-Ni martensitic alloys using ultrasonic methods and we have compared the results to recent neutron-scattering experiments. It is shown that the elastic behavior of Cu-Al-Ni alloys follows the same trends exhibited by other Cu-based alloys; in particular, the TA2 long-wavelength acoustic modes are softer than all other modes. Disciplin...

Dynamics of confined plumes during the short and ultra-short pulsed laser ablation of graphite

The optical emission from electronically excited C species in the ablation plume following the short (ns) and ultra-short (fs) UV pulsed laser ablation of graphite is studied. Wavelength, time and spatially resolved imaging of the plume, in background pressures of inert gases such as argon and helium, is performed. Analysis of images of optical emission from C+∗ ions and C2 radicals, yielded es...