Utilizing a GeO2 optical fiber for a 2.79 μm Er:LuYSGG CW laser transmission

IF 3 Q3 Physics and Astronomy Results in Optics Pub Date : 2025-02-20 DOI:10.1016/j.rio.2025.100800

Kunpeng Dong , Dunlu Sun , Huili Zhang , Jianqiao Luo , Cong Quan , Yuwei Chen , Zhentao Wang , Hongyuan Li , Maojie Cheng

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Abstract

We demonstrate the transmission of 2.79 μm continuous-wave (CW) Er:LuYSGG laser energy with a high coupling efficiency by a GeO₂ fiber for the first time. Based on the parameters of the Er:LuYSGG laser, a 2.79 μm laser and GeO₂ fiber coupling system is designed and constructed. The reasons for the decrease in coupling efficiency with increasing input power are analyzed. The transmission efficiency of the CW laser under different bending radii of the fiber is measured, and the fiber exhibits a low bending loss. Even at the smallest bending radius (R = 50 mm), the fiber still maintains over 81 % transmission efficiency and a maximum outpower of 399.2 mW. The beam profiles at the output end-face of the fiber reveal that the multimode fiber has a beam-shaping effect on the incident beam. Although the beam quality decreases, the energy distribution of the laser beam becomes more uniform. This work is expected to further promote the practical applications of mid-infrared (MIR) lasers and provide a valuable reference for future coupling studies between solid-state lasers and fibers.

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利用GeO2光纤传输2.79 μm Er:LuYSGG连续激光器

首次实现了以高耦合效率通过GeO2光纤传输2.79 μm连续波Er:LuYSGG激光能量。基于Er:LuYSGG激光器的参数，设计并构建了2.79 μm激光器与GeO2光纤的耦合系统。分析了输入功率增大导致耦合效率下降的原因。测量了连续波激光在不同光纤弯曲半径下的传输效率，光纤具有较低的弯曲损耗。即使在最小的弯曲半径（R = 50 mm）下，光纤仍然保持超过81%的传输效率和399.2 mW的最大输出功率。在光纤输出端面处的光束分布表明，多模光纤对入射光束具有光束整形效应。虽然光束质量下降，但激光束的能量分布变得更加均匀。该工作有望进一步促进中红外激光器的实际应用，并为今后固体激光器与光纤的耦合研究提供有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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