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On Saturday, Nov 8, 2003, Brian Whatcott wrote:
> One next remembers that there is an alternative to a
> quarter wave length of transmission line. This is a
> device of specific length and impedance intermediate
> between two line sections to be joined of greatly
> different characteristic impedances.
>
> One can instead, intersperse a length of gradually
> changing impedance, which matches the preceding
> and succeeding sections exactly. This has the great
> advantage of being broad band, so that one is not
> limited to a frequency where a quarter wave has a
> fixed length.
Has this kind of approach been used to make a
"broad band" antireflection coating on a lens?