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2024, Volume 25, Issue 7

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Frontiers of Information Technology & Electronic Engineering >> 2024, Volume 25, Issue 7 doi: 10.1631/FITEE.2300701

Numerical study of a bi-directional in-band pumped dysprosium-doped fluoride fiber laser at 3.2 μm

School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China; Research Center of Circuits and Systems, Peng Cheng Laboratory, Shenzhen 518055, China; Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201899, China; 

Received: 2023-10-16 Accepted: 2024-07-30 Available online: 2024-07-30
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Abstract

Dy-doped fluoride s have important applications in environment monitoring, real-time sensing, and polymer processing. At present, achieving a high-efficiency and high-power Dy-doped fluoride in the mid-infrared (mid-IR) region over 3 μm is a scientific and technological frontier. Typically, Dy-doped fluoride s use a unidirectional pumping method, which suffers from the drawback of high thermal loading density on the fiber tips, thus limiting power scalability. In this study, a bi-directional in-band pumping scheme, to address the limitations of output power scaling and to enhance the efficiency of the Dy-doped fluoride at 3.2 μm, is investigated numerically based on rate equations and propagation equations. Detailed simulation results reveal that the optical‍‒‍optical efficiency of the bi-directional in-band pumped Dy-doped fluoride can reach 75.1%, approaching the Stokes limit of 87.3%. The potential for further improvement of the efficiency of the Dy-doped fluoride is also discussed. The scheme offers the intrinsic advantage of mitigating the thermal load on the fiber tips, unlike unidirectional pumping, in addition to its high efficiency. As a result, it is expected to significantly scale the power output of Dy-doped fluoride s in the mid-IR regime.

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