Thermal noise and mechanical loss of SiO2/Ta2O5 optical coatings at cryogenic temperatures.
Opt Lett
; 46(3): 592-595, 2021 Feb 01.
Article
en En
| MEDLINE
| ID: mdl-33528416
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.
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01-internacional
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MEDLINE
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En
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Opt Lett
Año:
2021
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Article
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Estados Unidos