Physics – Optics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt........15w&link_type=abstract
Proquest Dissertations And Theses 2007. Section 0070, Part 0606 147 pages; [Ph.D. dissertation].United States -- Florida: Unive
Physics
Optics
2
Gravitational Wave Detector, Pendulum Suspension, Electro-Optic Modulator, Gravitational Waves
Scientific paper
The Laser Interferometer Gravitational Wave Observatory (LIGO) is now operating at its design sensitivity. To extend the ability to sense gravitational wave signals in a broader range with reasonable rate of detections, the Advanced LIGO has been planned and R&D for it is underway. Advanced LIGO is designed to have an order of magnitude better sensitivity then the current detector. This will be achieved by improving several technical features, including the use of triple pendulum suspension systems and an order of magnitude higher laser power.
Going from LIGO to Advanced LIGO requires new designs for some key components or subsystems. As part of the LIGO group at the University of Florida, I was involved in the research work related to two components of Advanced LIGO. These include the triple pendulum suspension system which has been designed and installed in the JIF lab at Glasgow University. My research provides a complete mechanical analysis for the triple pendulum and describe the local control system with feedback forces applied on the top mass via six electro-magnetic actuators. Also presented is the characterization measurement of the transfer function of this suspension system.
Another research project I have worked on focuses on the development and test of a novel electro-optic phase modulator (EOM), which is a key component of the input optics subsystem. The experiments include measurements of the physical properties of the EOM crystals (e.g. piezo-resonance and optical absorption at 1064 nm wavelength), characterization of the residual amplitude modulation and investigation of the additional laser amplitude and phase noise imposed by the EOM on a 1064nm laser beam.
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