Strategies to reduce the thermoelastic loss of multimaterial coated finite substrates

Understand

Thermoelastic loss is an important energy dissipation mechanisms in resonant systems.

• A careful analysis of the thermoelastic loss is critical to the design of low-noise devices for high-precision applications, such as the mirrors used for gravitational-wave detectors.
• In this paper, we present analytical solutions to the thermoelastic loss due to thermoelasticity between different materials that are in contact.
• We find expressions for the thermoelastic loss of multimaterial coatings of finite substrates, and analyze its dependencies on material properties, mirror design and operating experimental conditions.