
421CoatingsforfsLasers
Chapter 15
As mentioned, the application of ternary oxide mixture allows varying the refractive
index of the high refractive index material, continuously. Consequently, in contrast to
binary oxides, a variation of the refractive index as well as the material gap is possible.
For the optimization of the double-layer AR coating, the material composition of the high
refractive index layer can be changed. e optimized threshold is expected for the mate-
rial with the lowest refractive index, but the coating has to achieve a negligible reectance.
e solutions of the task are published by Macleod (1986). Figure 15.9 displays t ...