Thermal noise and mechanical loss of SiO2/Ta2O5 optical coatings at cryogenic temperatures

Mechanical loss of dielectric mirror coatings sets fundamental limits for both gravitational wave detectors and cavity-stabilized optical local oscillators for atomic clocks. Two approaches are used to determine the mechanical loss: ringdown measurements of the coating quality factor and direct meas...

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Veröffentlicht in:Optics letters 2021-02, Vol.46 (3), p.592-595
Hauptverfasser: Robinson, John M, Oelker, Eric, Milner, William R, Kedar, Dhruv, Zhang, Wei, Legero, Thomas, Matei, Dan G, Häfner, Sebastian, Riehle, Fritz, Sterr, Uwe, Ye, Jun
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Sprache:eng
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Zusammenfassung:Mechanical loss of dielectric mirror coatings sets fundamental limits for both gravitational wave detectors and cavity-stabilized optical local oscillators for atomic clocks. Two approaches are used to determine the mechanical loss: ringdown measurements of the coating quality factor and direct measurement of the coating thermal noise. Here we report a systematic study of the mirror thermal noise at 4, 16, 124, and 300 K by operating reference cavities at these temperatures. The directly measured thermal noise is used to extract the mechanical loss for SiO2/Ta2O5 coatings, which are compared with previously reported values.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.413758