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Broadband saturable absorption in germanene for mode-locked Yb, Er, and Tm fiber lasers
Nanophotonics ( IF 7.5 ) Pub Date : 2022-05-17 , DOI: 10.1515/nanoph-2022-0161
Qingbo Wang 1 , Jianlong Kang 2 , Pan Wang 1 , Jiangyong He 1 , Yicong Liu 1 , Zhi Wang 1 , Han Zhang 2 , Yan-ge Liu 1
Affiliation  

Passively mode-locked lasers have been widely investigated as one of the effective methods to obtain ultrashort pulses. As an important part of passively mode-locked fiber lasers, the exploration of 2D material-based saturable absorber has become one of the hotspots in ultrafast photonics in recent years. Germanene, a novel 2D Dirac material, with ultrafast optical response and broadband optical absorption, is a promising alternative material for saturable absorber in mode-locked fiber lasers. In this paper, germanium nanosheets are prepared via liquid-phase exfoliated method, with the saturable absorption property systematically characterized in three major wavebands of the near-infrared region. The generation of ultrashort pulses based on germanene saturable absorber in fiber lasers is further realized, in a broad waveband (1000 nm) centered at 1061.1, 1559.3 and 1883.5 nm, respectively. In addition, noise-like pulses operation with central wavelength of 1558.6 nm is also obtained, and the formation of rogue waves is further demonstrated via statistical analysis. To the best of our knowledge, this is the first experimental verification of the broadband saturable absorption property of germanene-based devices, covering three major fiber laser wavelengths from 1.0 to 2.0 μm.

中文翻译:

用于锁模 Yb、Er 和 Tm 光纤激光器的锗烯宽带可饱和吸收

被动锁模激光器作为获得超短脉冲的有效方法之一已被广泛研究。作为被动锁模光纤激光器的重要组成部分,二维材料基可饱和吸收体的探索成为近年来超快光子学研究的热点之一。锗烯是一种新颖的二维狄拉克材料,具有超快的光学响应和宽带光学吸收,是锁模光纤激光器中可饱和吸收体的一种很有前途的替代材料。本文采用液相剥离法制备锗纳米片,系统表征了近红外区三个主要波段的可饱和吸收特性。进一步实现了光纤激光器中基于锗烯可饱和吸收体的超短脉冲的产生,在分别以 1061.1、1559.3 和 1883.5 nm 为中心的宽波段 (1000 nm) 中。此外,还获得了中心波长为1558.6 nm的类噪声脉冲操作,并通过统计分析进一步证明了流氓波的形成。据我们所知,这是对锗烯基器件宽带可饱和吸收特性的首次实验验证,涵盖了从 1.0 到 2.0 μm 的三种主要光纤激光波长。
更新日期:2022-05-17
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