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Optimizing the pump wavelength to improve the transverse mode instability threshold of fiber laser by 3.45 times
Journal of Modern Optics ( IF 1.3 ) Pub Date : 2021-08-30 , DOI: 10.1080/09500340.2021.1967492
Yingchao Wan 1 , Baolai Yang 1, 2, 3 , Peng Wang 1, 2, 3 , Xiaoming Xi 1, 2, 3 , Hanwei Zhang 1, 2, 3 , Xiaolin Wang 1, 2, 3
Affiliation  

Transverse mode instability (TMI) in fiber lasers refers to the phenomenon of dynamic coupling between the fundamental mode (FM) and high-order modes (HOMs) when the pumping power exceeds a certain threshold, which seriously affects the power scaling of fiber laser. In order to improve the TMI threshold in the fiber laser, we optimized the pump wavelength both consider the quantum defect and the pump absorption. In the experiment, the pump wavelength is optimized and a wavelength-stabilized laser diode (LD) with a central wavelength of 969 nm is proposed as the pump source to suppress the TMI. A forward-pumped Yb-doped fiber laser oscillator with a core/cladding diameter of 30/400 µm was built experimentally. Experimental results show that the TMI threshold of the laser is 719 W when pumped by 969 nm LDs, which is 3.45 times that value when pumped by commonly used 976 nm LDs.



中文翻译:

优化泵浦波长使光纤激光器横模不稳定阈值提高3.45倍

光纤激光器中的横模不稳定性(TMI)是指泵浦功率超过一定阈值时基模(FM)和高阶模(HOM)之间的动态耦合现象,严重影响光纤激光器的功率缩放。为了提高光纤激光器中的 TMI 阈值,我们优化了泵浦波长,同时考虑了量子缺陷和泵浦吸收。在实验中,对泵浦波长进行了优化,并提出了中心波长为 969 nm 的波长稳定激光二极管 (LD) 作为泵浦源来抑制 TMI。实验构建了纤芯/包层直径为 30/400 µm 的正向泵浦掺镱光纤激光振荡器。实验结果表明,激光器在 969 nm LD 泵浦时的 TMI 阈值为 719 W,即 3。

更新日期:2021-09-08
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