水蒸气的太赫兹非线性光学响应
Terahertz Nonlinear Optical Response of Water Vapor
摘要：
我们报告了水蒸气在太赫兹频率的非线性光谱。大气水蒸气具有丰富的光谱，在低于3 THz的频率下具有几个强共振，落入大多数现有THz源的操作范围内。我们观察到一个非常大的非线性响应太赫兹辐射在这些共振的位置。利用光学克尔模型的非线性响应，我们估计的最小非线性折射率的数量级为10^2 m^2/W。我们的研究结果提供了对水分子能级的深入了解，并给出了其对电磁辐射的响应的更准确的图片，为更准确的THz光谱，成像和传感系统铺平了道路，从而促进了未来新兴的THz技术。
英文摘要：
We report on the nonlinear spectroscopy of water vapor at THz frequencies. Atmospheric water vapor has a rich spectrum with several strong resonances at frequencies below 3 THz, falling within the range of operation of most existing THz sources. We observe an extremely large nonlinear response to THz radiation at the positions of these resonances. Using the optical Kerr model for the nonlinear response, we estimate a minimum nonlinear refractive index of the order of 10^2 m^2/W. Our results provide insight into the energy levels of the water molecule and give a more accurate picture of its response to electromagnetic radiation, paving the way to more accurate THz spectroscopy, imaging and sensing systems, and thereby facilitating future emerging THz technologies.
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