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High-purity glasses are used for their low optical and mechanical loss, whichmakes them an excellent material for oscillators in optical systems, such asinertial sensors. Complex geometries often require the assembly of multiplepieces of glass and their permanent bonding. One common method is hydroxidecatalysis bonding, which leaves an enclosed medium layer. This layer hasdifferent mechanical properties to the bulk glass around it. The highermechanical loss of this layer makes it more susceptible to displacement noiseoriginating from the conversion of energy from oscillation to heat and viceversa. Therefore, other methods are needed to bond together glass assemblies.To investigate this, we have set up an experiment to measure the mechanicallosses of several different types of bond commonly used in fused silicamanufacturing, namely; plasma activated direct bonding, hydroxide catalysisbonding, laser welding, and adhesive bonding. In this paper we present theexperimental design and show initial results of the first test sample.

An Experiment to Test the Mechanical Losses of Different Bonding Techniques in Fused Silica