As a rising star of all‐carbon nanomaterial, graphdiyne (GDY) has a direct natural bandgap and features strong light–matter interaction, large optical absorption, superior chemical and optical stability, indicating its broad prospects in the field of photonics and optoelectronics. Herein, the broadband nonlinear absorption and transient absorption characteristics of GDY from visible to infrared region has been studied for the first time, and its promising application in ultrafast photonics has been explored. The large nonlinear absorption coefficient (> −1 cm GW⁻¹), low saturation intensity (<13 GW cm⁻²), and ultrafast relaxation time (<30 ps) of GDY are demonstrated, which indicates the outstanding potential of GDY in photonics among the emerging novel nonlinear optical (NLO) materials. The GDY is mixed with polyvinylpyrrolidone (PVP) to prepare the GDY–PVP nanocomposite, which further improved the stability of GDY. By using the GDY–PVP nanocomposite as saturable absorption material, ultrashort pulse lasers with pulse duration of 385.5 ps and 688 fs are obtained at 1 and 1.5 µm, respectively. This work reveals the excellent nonlinear optical properties of GDY and lays a foundation for its development in advanced nanophotonic devices.

中文翻译：

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Graphdiyne-聚合物纳米复合材料，用作超快光子学的宽带和稳健的饱和吸收剂

作为全碳纳米材料的后起之秀，石墨二炔（GDY）具有直接的自然带隙，并且具有强的光-物质相互作用，大的光吸收，优异的化学和光学稳定性，表明了其在光子学和光电子学领域的广阔前景。本文首次研究了GDY从可见光到红外区域的宽带非线性吸收和瞬态吸收特性，并探索了其在超快光子学中的应用前景。非线性吸收系数大（> -1 cm GW ^-1），饱和强度低（<13 GW cm ^-2），并展示了GDY的超快弛豫时间（<30 ps），这表明在新兴的新型非线性光学（NLO）材料中，GDY在光子学中具有巨大的潜力。将GDY与聚乙烯吡咯烷酮（PVP）混合以制备GDY-PVP纳米复合材料，从而进一步提高了GDY的稳定性。通过使用GDY–PVP纳米复合材料作为可饱和吸收材料，分别在1和1.5 µm处获得脉冲持续时间为385.5 ps和688 fs的超短脉冲激光器。这项工作揭示了GDY优异的非线性光学特性，并为其在先进的纳米光子器件中的发展奠定了基础。