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MON: Monday Contributed Sessions
MON 5: Optical Quantum Devices
MON 5.2: Talk
Monday, September 8, 2025, 14:30–14:45, ZHG010
Material aspects for high-precision optical metrology — •Nico Wagner1,2, Liam Shelling Neto1,2, and Stefanie Kroker1,2,3 — 1Institut für Halbleitertechnik, Technische Universität Braunschweig, Hans-Sommer-Str. 66, Braunschweig, 38106 Germany — 2Laboratory for Emerging Nanometrology, Langer Kamp 6a-b, Braunschweig, 38106 Germany — 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
High-precision optical metrology relies on materials with outstanding thermal and mechanical stability to push the limits of frequency accuracy. We explore material solutions that enhance the performance of ultra-stable optical cavities and laser systems. NEXCERA, a ceramic with a ultra-low thermal expansion coefficient at room temperature, shows reduced thermal noise compared to commonly used materials, making it ideal for cavity spacers. In mirror development, crystalline AlGaAs/GaAs coatings demonstrate lower mechanical loss than traditional amorphous coatings, though light-induced effects can introduce additional noise. We present insights into how illumination affects the mechanical loss and elasticity of GaAs. Furthermore, metamirrors—structured single-layer reflectors—offer a route to high reflectivity with significantly reduced thermal noise. For spectral-hole burning applications, the rare-earth-doped crystal Eu3+:Y2SiO5 exhibits low cryogenic mechanical losses, making it a promising candidate for alternative laser stabilization techniques. These material innovations contribute to the advancement of robust and compact systems for future applications in optical frequency standards and precision metrology.
Keywords: optical metrology; ultra-stable lasers; thermal noise; mechanical loss; materials