Pump quantum efficiency optimization of 3.5 μm Er-doped ZBLAN fiber laser for high-power operation.

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Frontiers of Optoelectronics Pub Date : 2023-11-09 DOI:10.1007/s12200-023-00089-w
Lu Zhang, Shijie Fu, Quan Sheng, Xuewen Luo, Junxiang Zhang, Wei Shi, Jianquan Yao
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Abstract

976 nm + 1976 nm dual-wavelength pumped Er-doped ZBLAN fiber lasers are generally accepted as the preferred solution for achieving 3.5 μm lasing. However, the 2 μm band excited state absorption from the upper lasing level (4F9/2 → 4F7/2) depletes the Er ions population inversion, reducing the pump quantum efficiency and limiting the power scaling. In this work, we demonstrate that the pump quantum efficiency can be effectively improved by using a long-wavelength pump with lower excited state absorption rate. A 3.5 μm Er-doped ZBLAN fiber laser was built and its performances at different pump wavelengths were experimentally investigated in detail. A maximum output power at 3.46 μm of ~ 7.2 W with slope efficiency (with respect to absorbed 1990 nm pump power) of 41.2% was obtained with an optimized pump wavelength of 1990 nm, and the pump quantum efficiency was increased to 0.957 compared with the 0.819 for the conventional 1976 nm pumping scheme. Further power scaling was only limited by the available 1990 nm pump power. A numerical simulation was implemented to evaluate the cross section of excited state absorption via a theoretical fitting of experimental results. The potential of further power scaling was also discussed, based on the developed model.

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3.5μm掺铒ZBLAN光纤激光器的泵浦量子效率优化。
976纳米 + 1976nm双波长泵浦掺铒ZBLAN光纤激光器通常被认为是实现3.5μm激光的优选解决方案。然而,来自较高激光能级的2μm波段激发态吸收(4F9/2 → 4F7/2)耗尽了Er离子布居反转、降低了泵浦量子效率并限制了功率缩放。在这项工作中,我们证明了使用具有较低激发态吸收率的长波长泵浦可以有效地提高泵浦量子效率。建立了一个3.5μm掺铒ZBLAN光纤激光器,并对其在不同泵浦波长下的性能进行了详细的实验研究。最大输出功率为3.46μm ~ 在优化的泵浦波长为1990nm的情况下,获得了斜率效率(相对于吸收的1990nm泵浦功率)为41.2%的7.2W,并且与常规1976nm泵浦方案的0.819相比,泵浦量子效率增加到0.957。进一步的功率缩放仅受到可用的1990nm泵浦功率的限制。通过对实验结果的理论拟合,对激发态吸收的截面进行了数值模拟。基于所开发的模型,还讨论了进一步功率缩放的潜力。
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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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