One of the latest laser beam applications is to selectively pump energy and generate coherent radiation transferred to another wavelength. It expands because the amount of generating sources with different selective wavelength permanently grows. Especially it applies to laser diode pumped systems resulting with highly efficient all solid-state compact lasers. These systems require well fitted thin layers' coatings. For microchip lasers as well as for parametric generators, the project of thin-layers stacks needs wide spectral analysis. Thin layer coatings for compact lasers have been elaborated. Stacks were based on oxide layer and were made with classical electron beam equipment.
"Thin layer coatings for coherent pumped lasers", Proc. SPIE 3186, Laser Technology V: Physics and Research and Development Trends, (14 August 1997); doi: 10.1117/12.280490; https://doi.org/10.1117/12.280490