| Abstract |
A transparent substrate (6)comprising on at least one of its faces an antireflection coating particularly at normal incidence made of a multiplayer(A)of thin layers,characterized in that the multiplayer comprises ,in succession: a first layer(1)with a refractive index n1of between 1.8and 2.2 and geomatrecal hickness e1 of between 5and 50nm, a second layer (2) with refrective index n2 of between 1.35 and 1.65 and a geomatrecal thickness e2 of betwwen 5 and 50 mn a third layer (3) with a refrective index n3 of between 1.8 and 2.2 and a geometrical thichness e3 of between 40 and 150nm a fourth layer (4) with a refractive index n4 of between 1.35 and 1.65 and a geometrical thickness e4 of between 40 and 150nm. |