论文标题
水蒸气的Terahertz非线性光学响应
Terahertz Nonlinear Optical Response of Water Vapor
论文作者
论文摘要
我们报告了THZ频率下的水蒸气的非线性光谱。大气水蒸气具有丰富的频谱，在3THz以下的频率下具有多种较强的共振，落在大多数现有THZ源的运行范围内。我们观察到这些共振位置对THZ辐射的非线性反应非常大。使用光学KERR模型进行非线性响应，我们估计10^2 m^2/w的最小非线性折射率。我们的结果提供了对水分子的能量水平的洞察力，并更准确地了解了其对电磁辐射的响应，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 THE THE THE技术。
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.
