| 摘要 |
<p>A multi-layer anti-reflection coating (14) for simultaneously coupling electromagnetic radiation of two different wavelengths, 1 and 2, where 1 is greater than 2, from a first region (18) into a second region (14) is provided. The first region (18) has an index of refraction that is smaller than that of the second region (14). The anti-reflection coating (12) comprises three layers: (a) a first layer (12a) and a third layer (12c) that are essentially invisible to 1 and serve to reduce Fresnel losses for 2 and (b) a second layer (12b) sandwiched between the first and third layers (12a, 12c) that serves to reduce Fresnel losses for 1. The thickness and the index of refraction are calculated for each layer.</p> |
