Speaker
Fabio Bergamin
(AEI Hannover)
Description
Squeezed light has been employed at GEO 600 for almost 10 years, recently reaching the highest level ever measured on a large scale interferometer. This improvement was achieved after work towards the reduction of optical losses in the squeezed light injection path.
The in-air injection path was rebuilt by cleaning and substituting some optics. Faraday isolators were carefully tuned in order to achieve optimal isolation; the PBS mounts of the in-vacuum Faraday isolator are equipped with quadrant photodiodes for the monitoring of rejected light during the tuning operation.
Finally, while investigating second-order mode-mismatch, a way to correct for astigmatism was found.
Primary authors
Fabio Bergamin
(AEI Hannover)
Dr
James Lough
(AEI Hannover)
