在基于 FMF 可饱和吸收器的线性腔 Tm 光纤锁模激光器中产生类噪声脉冲

IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Infrared Physics & Technology Pub Date : 2024-09-15 DOI:10.1016/j.infrared.2024.105561
Feng Huang, Huanhuan Li, Longwei Luo, Fulin Lian, Can Li, Junjie Zhang, Kunyang Wang, Shiqing Xu
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引用次数: 0

摘要

作为一种基于非线性多模干涉(NL-MMI)效应的真正的可饱和吸收体(SA),基于少模光纤的器件因其全光纤结构和简单的制造工艺而具有许多令人兴奋的特性。本文通过在线性腔中采用 SMF-FMF-SMF 结构的 SA,展示了一种稳定的掺氩光纤激光器。在 1 W 的泵浦功率下,在 1940 nm 的中心波长和 10.51 nm 的 3 dB 带宽上产生了基底脉冲持续时间为 28 ps、相干峰值宽度为 0.77 ps 的单个类噪声脉冲 (NLP)。稳定的类噪声脉冲可从激光泵阈值持续到 2.2 W 的最大泵功率,而不会出现脉冲分裂。实验结果表明,在重复频率为 4.69 MHz 时,峰值平均输出功率为 116 mW,相应的最大脉冲能量为 24.73 nJ。63 dB 的信噪比(SNR)证实了我们光纤激光器的高稳定性,此外,8 小时的持续稳定性也得到了验证。实验结果表明,SMF-FMF-SMF 结构在工作于类噪声脉冲体制的简单而坚固的全光纤锁模激光器中具有巨大潜力。
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Generation of noise-like pulses in a linear-cavity Tm fiber mode-locked laser based on FMF saturable absorber

As a real saturable absorber (SA) based on the nonlinear multimode interference (NL-MMI) effect, the devices based on the few-mode fiber possess numerous exciting characteristics due to their all-fiber structure, straightforward manufacturing process. In this paper, by employing a SA with the SMF-FMF-SMF structure in a linear cavity, we demonstrate a stable mode-locked Tm-doped fiber laser. At the pump power of 1 W, a single noise-like pulse (NLP) with a pedestal pulse duration of 28 ps and coherent peak width of 0.77 ps is generated at a central wavelength of 1940 nm with a 3 dB bandwidth of 10.51 nm. The stable noise-like pulse can be sustained from the lasing pump threshold up to the maximum pump power of 2.2 W without experiencing pulse splitting. The experiment results in a peak average output power of 116 mW, along with a corresponding maximum pulse energy of 24.73 nJ at a repetition frequency of 4.69 MHz. The high stability of our fiber laser is confirmed by the signal-to-Noise Ratio (SNR) of 63 dB, and its enduring stability is additionally validated over an 8-hour period. The experimental findings suggest that the SMF-FMF-SMF structure has significant potential in the simple and robust all-fiber mode-locked lasers operating in the noise-like pulse regime.

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来源期刊
CiteScore
5.70
自引率
12.10%
发文量
400
审稿时长
67 days
期刊介绍: The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.
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