Q-switched fiber lasers are integral tools in science, industry, and medicine due to their advantages of flexibility, compactness, and reliability. All-optical strategies to generate ultrashort pulses have obtained considerable attention as they can modulate the intracavity Q factors without employing costly and complex electrically driven devices. Here, we propose a high-performance all-optical modulator for actively Q-switched pulse generation based on a microfiber knot resonator deposited with V2CTx MXene. Experimental results show that the obtained Q-switching pulses exhibit a wide adjustment range of repetition rate from 1 kHz to 20 kHz, a high signal-to-background contrast ratio of ∼55 dB, and a narrow pulse width of 8.82 μs, indicating great potentials of providing a simple and viable solution in photonic applications.

中文翻译：

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用于主动调 Q 脉冲生成的基于 MXene 的高性能全光调制器

调Q光纤激光器因其灵活性、紧凑性和可靠性等优点而成为科学、工业和医学不可或缺的工具。产生超短脉冲的全光学策略已经获得了相当多的关注，因为它们可以在不使用昂贵且复杂的电驱动设备的情况下调制腔内 Q 因子。在这里，我们提出了一种高性能全光调制器，用于基于用 V2CTx MXene 沉积的微纤维结谐振器产生主动调Q 脉冲。实验结果表明，所获得的调Q脉冲具有从1 kHz到20 kHz的宽重复率调节范围，~55 dB的高信背对比度，以及8.82 μs的窄脉宽，表明很好在光子应用中提供简单可行的解决方案的潜力。