Characterization of Ion-Beam-Sputtered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>Al</mml:mi><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math> Thin Films for Gravitational-Wave Interferometers

Thermal noise in amorphous coatings is a limitation for wide range of precision experiments such as gravitational-wave detectors (GWDs). Mirrors GWDs are composed multiple thin layers dielectric materials deposited on substrate: the stack made with high-refractive index interleaved low-refractive index. The goal to obtain high reflectivity and low thermal noise. In this paper we report optical mechanical properties ion-beam-sputtered aluminium fluoride (${\mathrm{Al}\mathrm{F}}_{3}$) films that have one lowest refractive indexes among known coating discuss their application current future GWDs.