LIGO Document T1000032-v1

Absorption Characterization of an ion beam figured sample

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T - Technical notes
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Absorption characterization by Ashot Markosyan at Stanford.

During the CSIRO kickoff meeting, it was brought to our attention that Ion beam figuring of fused silica may increase the absorption of fused silica (we use ion beam figuring in our Advanced LIGO process). We asked our polisher to modify a 1" sample that we provided by uniformly removing material from one side of the sample. They removed ~60nm of material from the front surface of a QED polished sample. There is no other history to the part, we simply want to know if the ion beam figuring changes the absorption characteristics of the glass.

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