A coupled model of electromagnetic and heat on nanosecond-laser ablation of impurity-containing aluminum alloy

Abstract

Nanosecond laser ablation is the theoretical revealed by a coupled model of electromagnetic and heat.

Functional gradient films on aluminum alloy to improve its laser‐induced damage ability and reduce pollutant particles’ generation

“…This equation is commonly expressed as a function of the incident electric field and the imaginary part of the permittivity function, 𝑞 = 𝜀𝜔 0 Im(𝜀 𝑚 )|𝐄(𝑟)| 2 , where ω is the angular frequency and ε m is the permittivity of the materials. 34 Stray light on the Al-based functional gradient films did not imply large laser fluences. 35 Hence, Ohm's law was used to calculate the heat source density,𝑞 = |𝐉| 2 ∕𝜎, where σ is the electrical conductivity of the materials.…”

“…The heat source density ( q [W/m 3 ]) given by$$q = {\bf{E}} \cdot {\bf{J}}$$, where E is the electric field and J is the current density. This equation is commonly expressed as a function of the incident electric field and the imaginary part of the permittivity function, $$q = \varepsilon {\omega _0}{\mathop{\rm Im}\nolimits} ({\varepsilon _m}){| {{\bf{E}}(r)} |^2}$$, where ω is the angular frequency and ε m is the permittivity of the materials 34 . Stray light on the Al‐based functional gradient films did not imply large laser fluences 35 .…”

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

“…Several methods have been used for LIDT simulation, such as the finite element method (FEM) and the finite difference time domain (FDTD) 30 – 32 The order of LIDT magnitude in simulation can be consistent with that in experiments currently. However, the mechanisms and performance of laser-induced damage in materials have not been clearly investigated yet.…”