USS Portland Tests High Energy Laser Weapon System in Gulf of Aden
(www.dvidshub.net)
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All mirrors have thermal limits and they do not handle various wavelengths the same.
Yeah I was thinking they might have figured a way to that makes it difficult or impossible to make a surface that can efficiently reflect the beam at certain frequencies or or a mix of wavelengths.
But the laser we were using was really powerful and the mirrors had zero problems as long as we kept them clean.