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Improvement of X-ray mirror surface using a coating with variable thickness

What is it about?

The surface of standard X-ray mirror substrates is typically not perfectly flat. On the nanometric scale, there are hills and valleys that can be compensated for by depositing a thin film of variable thickness: this is what is called differential deposition. By combining differential deposition and advanced optical metrology techniques, we demonstrate that surface height errors below 1 nanometre are achievable with this method.

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Patrice Bras
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