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Record finesse optical cavity

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As part of the final stabilization of the laser frequency clock 729 nm, the CIML team has developed a second reference optical cavity with a fineness record.
The measured fineness exceeds 180 000 corresponding to a peak width of approximately 5 kHz. To achieve such performance mirrors must have higher reflection rate R = (1-3.10-5).
These mirrors were optically contacted by Emeline BIZRI (IE young laboratory) on the body spaceur ULE glass, feat when you consider that just their packaging output degrades these super-mirrors !