Disordered mullite grains in a sapphire-derived fiber for high-temperature sensing.

Abstract

In this study, a sapphire-derived fiber (SDF)-based Fabry-Pérot interferometer (FPI) is proposed and experimentally demonstrated as a high-temperature sensor using the arc discharge crystallization process, forming a region with disordered mullite grains. This shows that the disordered mullite grains are related to the gradual temperature distribution during the arc discharge process, which results in a larger refractive index (RI) modulation of the SDF near the fusing area, forming a reflection mirror. An FPI was obtained by combining the optical fiber end facet. Considering the high-temperature resistance of the fiber, the fabricated FPI was used for high-temperature sensing. This shows that the device can operate at temperatures of up to 1200 °C with a sensitivity of 15.47 pm/°C, demonstrating that the proposed devices have potential applications in high-temperature environments.

• Authors: Zhangwei Ma, Heming Wei, Liang Zhang, Zhifeng Wang, Zhenyi Chen, Fufei Pang, Tingyun Wang
• Journal: Optics express (Opt Express) Vol. 30 Issue 10 Pg. 16606-16618 (May 09 2022) ISSN: 1094-4087 [Electronic] United States
• PMID: 36221499 (Publication Type: Journal Article)