Speaker
Description
The implementation of Fabry-Perot cavities in gravitational-wave detectors has been pivotal to improving their sensitivity, allowing the observation of an increasing number of cosmological events with higher signal-to-noise ratio. Notably, Fabry-Perot cavities play a key role in the frequency-dependent squeezing technique, which provides a reduction of quantum noise over the whole observation frequency spectrum. The next generation of detectors such as Einstein Telescope – Low Frequency will need different filtering systems to meet their own quantum noise targets. For this purpose, different configurations of filter cavity are currently studied. Among these, linear three-mirror cavities could be particularly interesting because of their variable finesse which could offer additional control for frequency-dependent squeezing. The adaptability of linear three-mirror cavity optical properties also leads to one of their key features, the doubling of their resonant frequency. I will present simulations we performed to explore how the resonant behavior and stability of this system vary with its configuration.
