I guess BK7 is fine, we're not going to be putting high power in. I just though UV fused silica would be better practice if someone wanted to repurpose the flange in a few years. Seems like a minor extra cost.
Bottom line is that I don't think we have four identical of anything we can use. Should order 1.5" W2s from CVI or somewhere else?
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That was unfortunate. But why does BK7 uncompatible with the purpose? We need UV fused silica only for the high power reason, I thought.
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