Germanene: demonstration of the conversion from mode-locked to Q-switched mode-locked in Er-doped fiber laser

IF 2 4区物理与天体物理 Q3 OPTICS

Journal of Optics Pub Date : 2024-03-08 DOI:10.1088/2040-8986/ad2ed8

Yunao Han, Weiyu Fan, Shuo Sun, Caixun Bai, Guomei Wang, Huanian Zhang, Wenfei Zhang, Chonghui Li, Shicai Xu, Shenggui Fu, Cheng Lu

引用次数: 0

Abstract

Some two-dimensional layered mono-elemental materials have been reported as saturable absorbers (SAs) for the generation of various soliton phenomena, and many excellent results have been achieved. In our experiment, we made thin films of germanene-polyvinyl alcohol (Ge-PVA) and applied them as SA in Er-doped fiber lasers, investigated Ge’s characteristics, and demonstrated the conversion from mode-locked to Q-switched mode-locked (QML). The conventional mode-locked operation with a repetition rate of 9.63 MHz and a central wavelength of 1559.7 nm was stably triggered when the pump power exceeded the threshold of 40 mW. QML pulse with a central wavelength of 1530.26 nm and the maximum pulse energy of 86 nJ can be obtained by changing the pump power and polarization state of the light in the cavity. This work reveals the excellent optical properties of Ge SA in ultrafast fiber lasers and provide a new approach for the generation of QML pulses.

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Germanene：掺铒光纤激光器中从模式锁定到 Q 开关模式锁定的转换演示

一些二维层状单元素材料被报道用作产生各种孤子现象的可饱和吸收体（SA），并取得了许多出色的成果。在我们的实验中，我们制作了锗-聚乙烯醇（Ge-PVA）薄膜，并将其用作掺铒光纤激光器中的可饱和吸收体，研究了 Ge 的特性，并演示了从模式锁定到 Q 开关模式锁定（QML）的转换。当泵浦功率超过 40 mW 的阈值时，可稳定触发重复频率为 9.63 MHz、中心波长为 1559.7 nm 的传统锁模操作。通过改变泵浦功率和腔内光的偏振态，可获得中心波长为 1530.26 nm、最大脉冲能量为 86 nJ 的 QML 脉冲。这项工作揭示了 Ge SA 在超快光纤激光器中的优异光学特性，为产生 QML 脉冲提供了一种新方法。

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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来源期刊

Journal of Optics OPTICS-

CiteScore

4.50

自引率

4.80%

发文量

237

审稿时长

1.9 months

期刊介绍： Journal of Optics publishes new experimental and theoretical research across all areas of pure and applied optics, both modern and classical. Research areas are categorised as: Nanophotonics and plasmonics Metamaterials and structured photonic materials Quantum photonics Biophotonics Light-matter interactions Nonlinear and ultrafast optics Propagation, diffraction and scattering Optical communication Integrated optics Photovoltaics and energy harvesting We discourage incremental advances, purely numerical simulations without any validation, or research without a strong optics advance, e.g. computer algorithms applied to optical and imaging processes, equipment designs or material fabrication.