treatments are accomplished in a standard box coater using well known vacuum evaporation practices a u2014 the mold is loaded into the standard box coater such as a balzers bak760 and the chamber is pumped to a high vacuum level b u2014 hydrophobic top coat a fluorosilazane shin etsu kp801m is deposited onto the optical surface of the first part of the mold using a thermal evaporation technique to a thickness in the range of 2 15 nm c u2014 the dielectric multilayer anti reflecting ar coating consisting of a stack of high and low index materials is then deposited in reverse of the normal order details of this deposition are as such the first layer is a layer of of sio 2 having a physical thickness of 80 110 nm optical thickness about 100 160 nm the second layer is a layer of zro 2 having an optical thickness of about 160 nm the third layer is a sio 2 layer having an optical thickness of about 30 nm and the fourth layer is a zro 2 layer having an optical thickness of about 55 nm optical thickness are given at a warelength of 550 nm d u2014 at the completion of the deposition of the four layer anti reflecting stack a thin layer of sio 2 having a physical thickness of 1 50 nm is deposited this layer is to promote adhesion.