Solid State Physics
Solid State Physics concerns itself with the study of solid materials, primarily focusing on their internal structure and properties which arise from their composition as well as their arrangement at the atomic level. This field is integral to Laser Physics, given that lasers often rely on the interaction of light with solid state matter. The principles of Solid State Physics facilitate the understanding of semiconductor behavior in laser diodes, for instance. It's also crucial in explaining phenomena like stimulated emission and absorption, both fundamental to laser operation. Thus, Solid State Physics provides a foundational understanding of the solid state materials that are integral to many aspects of Laser Physics.