Additionally, we must concern ourselves with the relative scale as compared to the wavelength of light.
Depending upon the degree of transparency, different approaches for modeling the laser heat source are appropriate. Solid materials can be either partially transparent or completely opaque to light at the laser wavelength. Within this blog post, we will neglect convection and concern ourselves only with the heating of solid materials. Liquids and gases (and plasmas), of course, can also be heated by lasers, but the heating of fluids almost always leads to significant convective effects. When laser light hits a solid material, part of the energy is absorbed, leading to localized heating. This collimated, coherent, and single frequency light source can be used as a very precise heat source in a wide range of applications, including cancer treatment, welding, annealing, material research, and semiconductor processing.
Typically, the output of a laser is also focused into a narrow collimated beam. Laser light is very nearly single frequency (single wavelength) and coherent. While many different types of laser light sources exist, they are all quite similar in terms of their outputs. Today, we will discuss various approaches for simulating the heating of materials illuminated by laser light.Īn Introduction to Modeling Laser-Material Interactions The answer, of course, depends on exactly what type of problem you want to solve, as different modeling techniques are appropriate for different problems. A question that we are asked all of the time is if COMSOL Multiphysics can model laser-material interactions and heating.
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