Effect of Optical Coating and Surface Treatments on Mechanical Loss in Fused Silica

Details Effect of Optical Coating and Surface Treatments on Mechanical Loss in Fused Silica Effect of Optical Coating and Surface Treatments on Mechanical Loss in Fused Silica

1999-11-17

arxiv.org/abs/physics/9911040v3

Physics

Instrumentation and Detectors

7 pages, 2 figures. Accepted for publication in the Proceedings of the Third Eduardo Amaldi Conference on Gravitational Waves,

Scientific paper

10.1063/1.1291872

We report on the mechanical loss in fused silica samples with various surface treatments and compare them with samples having an optical coating. Mild surface treatments such as washing in detergent or acetone were not found to affect the mechanical loss of flame-drawn fused silica fibers stored in air. However, mechanical contact (with steel calipers) significantly increased the loss. The application of a high-reflective optical coating of the type used for the LIGO test masses was found to greatly increase the mechanical loss of commercially polished fused silica microscope slides. We discuss the implications for the noise budget of interferometers.

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