JGW-G1605018-v1
- Document #:
- JGW-G1605018-v1
- Document type:
- G
- Submitted by:
- Manuel Marchio
- Updated by:
- Manuel Marchio
- Document Created:
- 21 Mar 2016, 00:59
- Contents Revised:
- 21 Mar 2016, 00:59
- DB Info Revised:
- 21 Mar 2016, 00:59
- In the KAmioka GRAvitational wave detector (KAGRA), the mirrors will be cooled down to 20K in order to reduce thermal noise. Sapphire mirrors will be used because of their good thermal conductivity at low temperature.
In order to enhance the cooling down procedure, mirror's optical absorption properties are investigated. An experiment for characterizing the surface and the bulk absorption properties is set up. The photo thermal common path interferometer (PCI) method has been used. Numerical simulations have been performed for comparison of surface and bulk absorption. Using proper calibrations, the optical absorption is measured. Several samples for bulk and reflective coating absorption has been measured.
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