in the field of interferometric-based gravitational wave detection (GWD), where optical coatings for mirrors must have extremely high performance, thermal annealing plays a key role in shaping the properties of optical coatings. So far, its effects on the coatings have been explored mainly only by ex-post analysis, which provides no information about the dynamics of the annealing. We present an in situ spectroscopic ellipsometry (SE) characterization of the thermal annealing on an amorphous mixed titania-tantala coating, one of the key materials in current GWD mirrors. This work provides the first in situ report of the effects of the annealing on the refractive index and thickness of a titania-tantala coating.
Monitoring the evolution of temperature-dependent properties in optical coatings for gravitational wave interferometry
Stefano Colace;Shima Samandari;Michael Caminale;Gianluca Gemme;Maurizio Canepa;Michele Magnozzi.
2024-01-01
Abstract
in the field of interferometric-based gravitational wave detection (GWD), where optical coatings for mirrors must have extremely high performance, thermal annealing plays a key role in shaping the properties of optical coatings. So far, its effects on the coatings have been explored mainly only by ex-post analysis, which provides no information about the dynamics of the annealing. We present an in situ spectroscopic ellipsometry (SE) characterization of the thermal annealing on an amorphous mixed titania-tantala coating, one of the key materials in current GWD mirrors. This work provides the first in situ report of the effects of the annealing on the refractive index and thickness of a titania-tantala coating.
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