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首页> 外文期刊>Nanotechnology >Utilization of group 10 2D TMDs-PdSe2 as a nonlinear optical material for obtaining switchable laser pulse generation modes
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Utilization of group 10 2D TMDs-PdSe2 as a nonlinear optical material for obtaining switchable laser pulse generation modes

机译：利用组10 2D TMDS-PDSE2作为用于获得可切换激光脉冲产生模式的非线性光学材料

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摘要

In-plane anisotropic two-dimensional (2D) materials have gained considerable interest in the field of research, due to having the potential of being used in different device applications. Recently, among these 2D materials, group 10 transition metal dichalcogenides (TMDs) pentagonal Palladium diselenide (PdSe2) is utilized in various sections of researches like nanoelectronics, thermoelectric, spintronics, optoelectronics, and ultrafast photonics, owing to its high air stability and broad absorption spectrum properties. In this paper, it is demonstrated that by utilizing this novel 2D layered PdSe2 material as a saturable absorber (SA) in an EDF laser system, it is possible to obtain switchable laser pulse generation modes. At first, the Q-switching operation mode is attained at a threshold pump power of 56.8 mW at 1564 nm, where the modulation range of pulse duration and repetition rate is 18.5 mu s-2.0 mu s and 16.4 kHz-57.0 kHz, respectively. Afterward, the laser pulse generation mode is switched to the mode-locked state at a pump power of 63.1 mW (threshold value) by changing the polarization condition inside the laser cavity, and this phenomenon persists until the maximum pump power of 230.4 mW. For this mode-locking operation, the achieved pulse duration is 766 fs, corresponding to the central wavelength and 3 dB bandwidth of 1566 nm and 4.16 nm, respectively. Finally, it is illustrated that PdSe2 exhibits a modulation depth of 7.01%, which substantiates the high nonlinearity of the material. To the best of the authors' knowledge, this is the first time of switchable modes for laser pulse generation are achieved by using this PdSe2 SA. Therefore, this work will encourage the research community to carry out further studies with this PdSe2 material in the future.
机译：平面内各向异性二维（2D）材料由于具有用于不同器件应用的潜力，在研究领域获得了相当大的兴趣。最近，在这些2D材料中，第10族过渡金属二卤化物（TMD）五边形钯二硒化物（PdSe2）由于其高空气稳定性和宽吸收光谱特性，被用于纳米电子学、热电、自旋电子学、光电子和超快光子学等多个研究领域。本文证明，在EDF激光系统中，利用这种新型的2D层状PdSe2材料作为可饱和吸收体（SA），可以获得可切换的激光脉冲产生模式。首先，在1564nm的阈值泵浦功率为56.8mW时，实现了调Q工作模式，其中脉冲宽度和重复频率的调制范围分别为18.5μs-2.0μs和16.4 kHz-57.0 kHz。之后，通过改变激光腔内的偏振条件，激光脉冲产生模式在63.1 mW（阈值）的泵浦功率下切换到锁模状态，并且这种现象持续到230.4 mW的最大泵浦功率。对于这种锁模操作，实现的脉冲持续时间为766fs，分别对应于1566nm和4.16nm的中心波长和3db带宽。最后，说明PdSe2具有7.01%的调制深度，这证实了材料的高度非线性。据作者所知，这是首次使用这种PdSe2 SA实现激光脉冲产生的可切换模式。因此，这项工作将鼓励研究界在未来用这种PdSe2材料进行进一步的研究。

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