Speaker
Marc Eisenmann
(NAOJ)
Description
KAGRA is the only gravitational wave detector operating with crystalline test-masses at cryogenic temperature. While this allow to reduce the thermal noise of the detector, this comes at the expense of operating with complex test-masses. One issue, is the birefringence of these test-masses that can spoil the detector sensitivity.
In this talk, we will report about the techniques developed to measure the birefringence of large sapphire substrates forming KAGRA test-masses as well as the birefringence mitigation and compensation techniques being currently developed towards a possible installation in KAGRA
Author
Marc Eisenmann
(NAOJ)
Co-authors
Chenjie Zhou
(Beijing Normal University)
Clement Jacquet
(IL2IT)
Frederic Cleva
(OCA)
Haoyu Wang
(Institute of Science Tokyo)
Ryutaro Takahashi
(NAOJ)
Shalika Singh
(Institute of Science Tokyo)
Stephanie Grabielle
(OCA)