This study intends to present a simple two-temperature model TTM for the fast calculation of the ablation depth as well as the corresponding effective penetration depth for stainless steel by considering temperature-dependent material parameters. The model is validated by a comparison of the calculated to the experimentally determined ablation depth and the corresponding effective penetration depth in dependence on the pulse duration fs up to 10 ps and the fluence. The TTM enables to consider the interaction of pulsed laser radiation with the electron system and the subsequent interaction of the electrons with the phonon system. The theoretical results fit very well to the experimental results and enable the understanding of the dependence of the ablation depth and of the effective penetration depth on the pulse duration.
Depth of penetration of an nm wavelength low level laser in human skin
State of the art system for topographic electrical characterization of multicrystalline bricks in fabs with high throughput Production integrated high speed wafer mapping of carrier lifetime. Single wafer topograms in less than one second a wafer. Low cost table top lifetime measurement system for characterization of a variety of different silicon samples at different
Depth of penetration of an 850nm wavelength low level laser in human skin
Penetration depth of ultraviolet, visible light and infrared radiation in biological tissue has not previously been adequately measured. Risk assessment of typical intense pulsed light and laser intensities, spectral characteristics and the subsequent chemical, physiological and psychological effects of such outputs on vital organs as consequence of inappropriate output use are examined. This technical note focuses on wavelength, illumination geometry and skin tone and their effect on the energy density fluence distribution within tissue. Monte Carlo modelling is one of the most widely used stochastic methods for the modelling of light transport in turbid biological media such as human skin. Using custom Monte Carlo simulation software of a multi-layered skin model, fluence distributions are produced for various non-ionising radiation combinations.
Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material. When electromagnetic radiation is incident on the surface of a material, it may be partly reflected from that surface and there will be a field containing energy transmitted into the material. This electromagnetic field interacts with the atoms and electrons inside the material. Depending on the nature of the material, the electromagnetic field might travel very far into the material, or may die out very quickly.