| Zugriffsnummer | 56261 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Photo-birefringent effects in crystalline AlGaAs mirror coatings |
| Autor(in); Institution |
Yu, Jialiang; QUEST, FG 2, Quantenuhren und komplexe Systeme, PTB-Braunschweig
|
| Quelle/Jahr | Optics Express: 34 (2026), 14, 25456 - 25468 |
| Availability | [online only] |
| ISSN | 1094-4087 (online) |
| DOI | |
| Persistent Identifier | |
| Verlag | Washington, DC: Optica Publishing Group |
| Freie Schlagworte | ultrastable laser ; crystalline coatings ; photo birefringent effect ; semiconductor bandgap ; room temperature |
| Zusammenfassung | High-reflective crystalline GaAs/Al0.92Ga0.08As coatings show reduced Brownian noise compared to conventional dielectric coatings. However, several ultra-stable laser systems observed additional noise sources that hinder the realization of the expected improvements in frequency stability. These additional noise sources are related to the birefringence of the coatings, which can also be modified by intracavity light. While the origin of the birefringence is not yet well understood, its modification via illumination remains also unexplained. Here, we present an extensive study on the steady-state and transient modification of the birefringence by intracavity light and by uniform illumination at various wavelengths using an optical cavity at room temperature. We find a unified description that suggests a primary two-photon process for photon energies below the bandgap of GaAs, or a single-photon process at higher energies. Adding external illumination allows us to reduce noise induced by laser power fluctuations by balancing the photo-thermo-optic response of the mirrors and the photo-birefringent effect at more favorable low intracavity power levels. |
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Forschungsprojekt | We acknowledge support by the Project 20FUN08 NEXTLASERS, which has received funding from the EMPIR programme cofinanced by the Participating States and from the European Union’s Horizon 2020 Research and Innovation Programme, and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy–EX-2123 QuantumFrontiers (Project No. 390837967). This work is partially supported by the Max Planck-RIKEN-PTB Center for Time, Constants and Fundamental Symmetries. We thank Jun Ye and Dhruv Kedar for the insightful discussions. |
| Förderinformationen (1) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMPIR 2020 Fundamentals Titel der Förderung: 20FUN08: NEXTLASERS: Next generation ultrastable lasers: reducing thermal noise limit and overcoming technical limitations with new materials and technologies Förderungsnummer: 20FUN08 |
| Förderinformationen (2) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderprogramm: Germany’s Excellence Strategy–EX-2123 QuantumFrontiers Titel der Förderung: EXC-2123 QuantumFrontiers Förderungsnummer: 390837967 |