No Access Submitted: 27 November 2018 Accepted: 04 January 2019 Published Online: 17 January 2019
Appl. Phys. Lett. 114, 021106 (2019); https://doi.org/10.1063/1.5083011
We report a simple technique for the realization of fiber-based Fabry-Pérot microcavities with large Q/V values as well as high cavity-to-fiber coupling efficiencies. The open microcavity we demonstrate consists of a flat mirror and a concave mirror on the tip of a single mode optical fiber. Combining hydrofluoric acid chemical wet etching with CO2 laser reflow, we obtain a fiber-tip atomically smooth concave surface with a diameter of 4.7 μm determined by the fiber core size. The concave surface with a spherical profile is automatically aligned with the fiber core, which enables high cavity-to-fiber power coupling efficiency (higher than 90%) with an optimal fiber-tip mirror's radius of curvature based on numerical simulation results. After distributed-Bragg-reflector coating, we have realized a wavelength-tunable open microcavity with a quality factor Q exceeding 1000 and a mode volume V of 13.6 μm3, and laser emission is demonstrated from this microcavity.
We thank Dr. Yixiao Gao, Mr. Peizhen Xu, and Mr. Hao Wu for their great help in guidance and discussions. This work was supported by the National Basic Research Program of China (Program 973) (No. 2014CB921303), the National Natural Science Foundation of China (No. 61635009), and the Fundamental Research Funds for the Central Universities (No. 2018FZA5004). A. Rahimi-Iman acknowledges financial support by the German Federal Ministry of Education and Research (BMBF) in the frame of the German Academic Exchange Service's (DAAD) program Strategic Partnerships and Thematic Networks.
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  1. © 2019 Author(s). Published under license by AIP Publishing.