Patent ID: 7852562
Filing Date: 2010-12-14
Classification: G02B,G11B

Abstract:
1. A method for producing an antireflection optical element for use with a high power blue laser, having a multi-layered film obtained by alternately stacking layers consisting of a low-refractive-index material and layers consisting of a high-refractive-index material on a plastic substrate, wherein producing conditions are determined in such a way that plasma is generated while the layer consisting of the high-refractive-index material is formed and the produced optical element may have an oxygen permeability coefficient that is 30 cm 3 ·mm/(m 2 ·24hr·atm) or less such that an amount of change in laser permeability obtained after a blue laser having an energy density of 120 mW/mm 2 is continuously irradiated at an ambient temperature of 25° C. for 1000 hours is 2% or less.