Second-Harmonic Generation in Atomic Hydrogen

原子氢中的二次谐波产生

• 批准号: 02640290
• 负责人: HAKUTA Kohzo
• 金额: $ 1.54万
• 依托单位: University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640290/
• 关键词: Atomic hydrogen; Second-harmonic-generation; Nonlinear optics; Vacuum-UV radiation; Photoionization; Second Harmonic Generation(SHG); Atomic Hydrogen; Vacuum Ultraviolet Generation; Threeーwave Mixing; Harmonic Generation

The generation of second-harmonc radiation in atomic hydrogen at 121.6 run was investigated with and without an applied electric field. Experiments were carried out without the application of an electric field and the mechanism responsible for second-harmonic generation was studied. It has been shown that the incident radiation at 243 nm wavelength iodm the hydrogen atoms by fl"photon absorption and the resultin charge distribution produces an electric-field, the charge-separation field. This electric-field breft the symmetry of the isotropic gas and results in radiation at 121.6 nm.Second-harmonic generation is forbidden in an isotropic medium under the electric dipole approximation. Previous observations of second-harmonic generation in atomic gases without any applied fields were explained by involving contributions of higher-order moments, or intensity gm(hents of the Lum beam, or collisional effects, or charge-separation fields. The simple electronic structure of atomic hydrogen and the carefully chosen experimental conditions in the present work ehmted the possibility of other explanations of the last one. Values of charge separation field were obWW experimentally under various conditions, and were shown to be conffitent with theoretical estimates derived in this work.

在121.6运行时，原子氢中的第二谐和辐射产生和没有施加的电场。在不应用电场的情况下进行了实验，并研究了负责第二次谐波生成的机制。已经表明，在243 nm波长iodm处的入射辐射通过fl“光子吸收”和结果电荷分布产生一个电场，电荷分离场。这种电场Brefft dield offerf the dosotropic Gas的对称性和在121.6 nm nm.second harmocon heperitiver中的辐射中的辐射量均超出了iSotropic inimimiim inimimiim inimiim，通过涉及较高阶段或强度GM的贡献（LUM光束或碰撞效应或碰撞效应或电荷分离区域的贡献）的贡献来解释在没有任何应用领域的原子气中的第二次谐波产生。原子氢的简单电子结构以及在当前工作的各个范围中，原子氢和精心挑选的实验的范围的简单范围是ob ob ob of其他的实验。并被证明与这项工作中得出的理论估计相同。

项目成果

K. Hakuta, L. Marmet, and B. P. Stoicheff: "Electric-Field-Induced Second-Harmonic Generation with Reduced Absorption in Atomic Hydrogen" Physical Review Letters. 66. 596 (1991)

K. Hakuta、L. Marmet 和 B. P. Stoicheff：“电场诱导的二次谐波产生，原子氢吸收减少”物理评论快报。

K.Hakuta: "Second-Harmonic Generation with Reduced Absorption in Atomic Hydrogen,in "Laser Spectroscopy X:Proceedings of Tenth International Conference on Laser Spectroscopy"" World Scientific Inc.Editor,M.Ducloy,

K.Hakuta：“原子氢吸收减少的二次谐波，载于“激光光谱 X：第十届激光光谱国际会议论文集””世界科学公司编辑，M.Ducloy，

L.Marmet: "SecondーHarmonic Generation at Lymanーα in Atomic Hydrogen" Optics Letters. 16. 261-263 (1991)

L.Marmet：“原子氢中莱曼-α 的二次谐波产生”光学快报 16. 261-263 (1991)。

L. Marmet, K. Hakuta, and B. P. Stoicheff: "Second-Harmonic Generation in Atomic Hydrogen Induced by a Charge-Separation Field" Journal of the Optical Society of America (B).

L. Marmet、K. Hakuta 和 B. P. Stoicheff：“电荷分离场诱导的原子氢中的二次谐波产生”美国光学学会杂志 (B)。

K. Hakuta, L. Marmet, and B. P. Stoicheff: "Second-Harmonic Generation with Reduced Absorption in Atomic Hydrogen" "Laser Spectroscopy X : Proceedings of Tenth International Conference on Laser Spectroscopy". World Scientific Inc.

K. Hakuta、L. Marmet 和 B. P. Stoicheff：“原子氢吸收减少的二次谐波”“激光光谱 X：第十届激光光谱国际会议论文集”。