Design of a coating-less reference cavity with total internal reflection

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Abstract:: Thermal noise is one of the fundamental noise sources that limits frequency stabilization of lasers using an external cavity. This thermal noise comes from the mirror
substrate and multi-layered reflection coatings. The use of reflective coatings, and hence noise from them, can be eliminated by the technique of Total Internal Reflection
(TIR). This can be used in the building stabler optical cavities, a necessity in the field of gravitational wave detection. The project aims to search for an optimal design and substrate material for the cavity using TIR and reduction in thermal noise.

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LIGO Document T1300472-v1