Simulation and Control of a Coupled Optical Cavity System

Patra, Abhinav (2021) Simulation and Control of a Coupled Optical Cavity System. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Abhinav Patra (16MS175)) 16MS175_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (2MB)

Abstract

The maintenance of gravitational wave observatories such as the LIGO (Laser Interferometer Gravitational wave Observatory) at their operational conditions necessitates the use of many automated control loops. So, control design constitutes an irreplaceable part of various sub-systems at LIGO. The technical limitations in these control loops contribute a significant amount of noise to the instrument and depreciates its sensitivity. This has lead to the study of control design and the study of technical noise in becoming a chief topic of interest to work on and improve upon for the next generation of detectors. The main part of this report is a discussion on the optical design of a coupled cavity system due to its resemblance to the LIGO instrument in control topology, along with a scheme for independent length sensing of the cavities. Work also has been done on development and extraction of an optomechanical plant formed by suspended mirrors and optical spring formed by the circulating power in a coupled cavity system. Keywords : gravitational waves, interferometer length sensing, length control, coupled cavity system.

Actions (login required)

View Item