Publications by authors named "Manuel Marchio"
Article Synopsis
- High-quality sapphire substrates are essential for the KAGRA gravitational interferometer, serving as test masses to detect gravitational waves.
- Standard methods face challenges in studying these substrates due to their extremely low optical absorption, necessitating advanced techniques.
- This paper showcases a specialized absorption setup using Photo-thermal Common-path Interferometry to analyze sapphire samples, revealing that absorption variations are linked to the samples' growth history and structural defects.
Given their excellent optical and mechanical properties, substrate-transferred crystalline coatings are an exciting alternative to amorphous multilayers for applications in precision interferometry. The high mechanical quality factor of these single-crystal interference coatings reduces the limiting thermal noise in precision optical instruments such as reference cavities for narrow-linewidth laser systems and interferometric gravitational wave detectors. In this manuscript, we explore the optical performance of GaAs/AlGaAs crystalline coatings transferred to 50.
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