低维纳米材料光学二倍频效应的应用研究

As the continuous development of ultrafast optical technology in the fields such as optical telecommunications and integrated photonic circuity, it is desirable to construct miniaturized, integrable, energy efficient techniques for measuring ultrashort laser pulses. Low dimensional nanomaterials, with outstanding nonlinear optical properties, appear to be ideal candidate. To the best of our knowledge, our project for the first time propose to replace the conventional bulky nonlinear crystals with monolayer semiconductor two-dimensional materials in a consistent manner. By utilizing second-harmonic generations of monolayer two-dimensional materials, we will explore new techniques for complete measurements of weak and complicated ultrashort laser pulses, inculding pulse width, phase and chirp information. Besides, we will optimize the design of our proposal to improve overall sensitivity and realize the measurement of weak pulses with attojoule energy level. Our results will bring greatest benefit for ultrashort pulse measurements in higher sensitivity, footprint, performance and cost, and allow the seamless interconnection with optical fiber system and integrated photonic circuits, which provides new opportunities for boosting further developments of ultrafast techniques in various areas.

随着超快激光技术在光通讯以及集成光子学等领域的不断扩展，发展微型化、可集成、高灵敏度的超短脉冲测量技术变得越来越迫切。具有非线性光学特性的低维纳米材料是构建该种新型超短脉冲测量技术的理想载体。本课题首次提出了以单层半导体二维纳米材料替换传统的光学器件中的非线性晶体的新思路，利用其光学二倍频效应，构建基于单原子层材料的新型超短脉冲测量技术，实现对弱信号、复杂超短脉冲的脉宽、相位与啁啾信息的完整测量表征。并在此基础上，进一步优化结构设计，提高测量的灵敏度，实现对低至阿焦的超短脉冲测量。本项目的研究开展，将给超短脉冲测量方法带来更高灵敏度、更小尺寸、更好的性能与更低的成本等优势，同时易于与现有的光纤系统、集成光学系统实现无缝连接，为进一步推动超快光学技术在未来新领域的发展提供新的契机。

随着超快激光技术在光通讯以及集成光子学等领域的不断扩展，发展微型化、可集成、高灵敏度的超短脉冲测量技术变得越来越迫切。具有非线性光学特性的低维纳米材料是构建该种新型超短脉冲测量技术的理想载体。本课题首次提出了以单层半导体二维纳米材料替换传统的光学器件中的非线性晶体的新思路，利用其光学二倍频效应，构建得到了一系列基于单原子层材料的新型超短脉冲测量技术，实现了对弱信号、超连续脉冲信号的脉宽、相位与啁啾信息的完整测量表征。本项目的研究开展，将给超短脉冲测量方法带来更高灵敏度、更小尺寸、更好的性能与更低的成本等优势，同时易于与现有的光纤系统、集成光学系统实现无缝连接，为进一步推动超快光学技术在未来新领域的发展提供了崭新的方案。

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