Bothra, Yashwant (2024) Characterization & Optimization of Phase Camera for Advanced Virgo Gravitational Wave Detectors. Master's Thesis / Essay, Mechanical Engineering.
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Abstract
A thermal compensation system (TCS) has been commissioned in Advanced Virgo, using phase cameras (PCs) as wavefront sensors to identify the mode content of the output beam from the interferometer. However, due to the challenges in the interpretation of the phase images and its phase resolving capabilities, the practical use of the PC has been limited. This research focuses on optimizing the PC setup developed in Nikhef, primarily aiming to improve the system's phase resolution. In this research, we have characterized and optimized the prototype PC setup. We perform relative phase measurements. To improve the phase resolution, we conducted various stability measurements using different techniques such as accelerometers, quadrant photodiodes, microphones, and geophones. The main sources of phase noise were identified primarily as vibrational and acoustic. All optical components of the setup resonate (or vibrate) at distinct frequencies. By identifying and mitigating some of these major noise sources, we improved the phase resolution of the setup to about 5.2 mrad (λ/1200 at λ = 1064 nm). The results indicate that the prototype PC setup is highly stable and effectively designed, with phase-resolving capabilities well within the requirements. Further improvements in resolution could be achieved by isolating vibrational and acoustic disturbances from the interferometer setup.
| Item Type: | Thesis (Master's Thesis / Essay) |
|---|---|
| Supervisor name: | Kavatsyuk, M. and Lange, G. de |
| Degree programme: | Mechanical Engineering |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 21 May 2024 12:23 |
| Last Modified: | 21 May 2024 12:23 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/32404 |
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