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All contributed solutions to the coating design problem, sent out with the Advanced Program, are presented and evaluated. 2. THE PROBLEM Task: Design a multilayer antireflection to the specification given below. Two types of responses are solicited: Category A (conventional design): All layers are homogeneous and refractive indices correspond with the indices of the table; Category B (futuristic design): Mixtures of oxide materials (not with MgF2) are permitted, both as homogeneous layers with inbetween refractive indices and/or tranition layers. The goal is lowest Figure ofMerit F as defined under "Evaluation". Specification: Incidence medium index: 1.0 (air) Incidence angle: a=O°-30° (in air)Substrate Index: 1.52 Maximum Reflectance: r (Ra=)max < 1% and ((½Rs+½Rp)a=3O)max< 1% A = 400nm to 900nm Polarization: Unpolarized light Thicknesses: The physical thickness of all the layers together shall not exceed 2i, the physical thickness of all the Ti02-layers together shall not exceed l5Onm. 552

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