Date of Award
Doctor of Philosophy (PhD)
Stefan W. Ballmer
Angular control, Gravitational waves, LIGO, Optical spring, Radiation pressure
Physical Sciences and Mathematics
Alignment control in gravitational-wave detectors has consistently proven to be a
dicult problem due to the stringent noise contamination requirement for the gravitational
wave readout and the radiation-pressure induced angular instability in Fabry-
Perot cavities (Sidles-Sigg instability). In this thesis, I present optical springs as a
tool to damp the motion of a mirror. I discuss the design and implementation of a single
degree-of-freedom optical spring system and the importance of the photothermal
eect in properly predicting optical spring behavior.
I also present the development and implementation of an angular control scheme,
attempting to damp two degrees of freedom with two optical cavities. I then extend
this understanding into a plausible concept for implementing optical-spring-based
angular control in the Advanced LIGO detectors.
Kelley, David Bruce, "Angular trapping of a mirror using radiation pressure" (2015). Dissertations - ALL. 392.