NANO COATING DESIGNS OF RUBY LASER RESONATORS

Abstract

In this paper, we study the change in the optical properties of ZnO as a function of the particle size and we investigate its use with bulk GaSb for the design of multi-layer reflection optical coating with quarter wavelength thickness for a GaAs substrate .We developed a MATLAB version 10 software to describe the reflectivity of the coating as a function of particle size, refractive index and energy gap. It computes the reflectivity as a function of the wavelength for vertical and oblique incidence. The calculation is based on the Brus model and uses the Characteristic Matrix Theory as a theoretical basis. The results indicate that the maximum value of the reflectivity at the interface Air/GaSb/Nano ZnO/GaAs is(Rs=100%,Rp= 99.8719 %) for oblique incidence at (𝜃 = 45° ) and (R=99.9885%) for a perpendicular incidence when the particle size of the coating material is Ps = 2.6 nm, and by using four layer of coating Air/GaSb/NanoZnO. We suggest this could be used the design of reflective coatings for ruby laser resonators.