Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-06-18
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Ph.D. thesis, University of Pisa & LIGO-Caltech, 185 pages
Scientific paper
This thesis presents a collection of different researches on non-standard optics in view of enhancing the performances of the Advanced Gravitational waves interferometric detectors, where the thermal noise of the test masses is expected to be a limiting factor for their sensitivity. We provide a quantitative analysis of the impact of non-Gaussian beams on different kinds of thermal noises. We developed the theory of mesa beam, in view of a future implementation in advanced GW interferometers of the mesa beam idea, focusing on the analytical derivation of the quantities (i.e. beam width, divergence, propagation factor), which are chosen as ISO standard reference parameters for the characterization of an optical beam. We also analytically proved a new duality relation between optical cavities with non-spherical mirrors. The interest of the GW community in this new beam technology led us to the construction and testing of a prototype mesa beam Fabry-Perot cavity with Mexican-hat mirror. Part of the work of this thesis was devoted to the development of new simulation programs of optical systems. These programs provided the theoretical expected behaviour of our experiment, in particular cavity modes structure and misalignments sensitivity to be confronted with the experimental results. We also explored another complementary way of reducing the mirror thermal noise, beside the beam shaping, that is the multi-layered coating thickness optimization. We show it to be effective in reducing the coating noise and explore the possible implications for GW interferometers in terms of sensitivity. During this analysis we developed an independent model for the coating effective elastic parameters, which is based on the well understood subject of homogenization theory.
No associations
LandOfFree
Researches on Non-standard Optics for Advanced Gravitational Waves Interferometers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Researches on Non-standard Optics for Advanced Gravitational Waves Interferometers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Researches on Non-standard Optics for Advanced Gravitational Waves Interferometers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-273458