SAMOP 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 2: Nano-Optics and Optomechanics
Q 2.3: Poster
Montag, 20. September 2021, 16:30–18:30, P
Measurement of the photoelastic constant at cryogenic temperatures for the calculation of the photoelastic noise of the Einstein Telescope — •Jan Meyer1,2, Johannes Dickmann1,2, Mika Gaedtke1,2, and Stefanie Kroker1,2 — 1Laboratory for Emerging Nanometrology (LENA),Langer Kamp 6a/b, 38106 Braunschweig, Germany — 2Cluster of Excellence QuantumFrontiers
Currently most precise measurement instruments are gravitational wave detectors with a relative precision of less than 10−23. This accuracy is limited by various noise sources. Most of the critical noise sources are driven by thermal fluctuation in the optical components of the detector, e.g. input mirrors of the cavities in the interferometer arms or the beamsplitter. To further enhance the sensitivity and, thus, the detection range, all potentially critical noise sources must be quantified and, if possible, mitigated. In this poster we present for the first time a noise source based on the photoelastic effect in solids. The photoelastic effect describes the change of the refractive index based on the local deformation of a material. The thermal fluctuations inside the optical parts lead to local deformations and, hence, to the local change of the refractive index. We present first calculations of the photoelastic noise for the Einstein Telescopes beamsplitter at a temperature of 300 K and the input mirrors of the cavities in the interferometer arms at 10 K. Due to the insufficient literature values of the photoelastic constant at cryogenic temperature, we developed a measurement setup to close this knowledge gap.