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At 12:50 PM 11/8/2003, Ludwik, you wrote:
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?
I am not familiar with examples of graded index
anti reflection coatings.
The graded index fiber light guide is ubiquitous.