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Broadband AR coating

Though AR coating is basic, essential, and like "roots" of coating technology, the efforts to improve AR performance
has been rather disregarded by vendors for a long time.
Eventually it is currently not easy to find state-of-the-art AR coating in the commercial market in spite of the long history
and importance for astronomical optics.
AR coating should be more noticeable, because it determines the available wavelengths in your instrument,
or contributes to reduce the negative effect of ghost caused by multiple-reflection.

Asahi recently succeeded in coating the outstanding broadband AR coating which fulfills "R(average) < 0.8% over
1.5 octaves range".

figure Super broadband AR