Challenge of new extreme material science using high-energy THz source

使用高能太赫兹源的新极限材料科学的挑战

• 批准号: 20686005
• 负责人: HIGASHIGUCHI Takeshi
• 金额: $ 11.9万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (A)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20686005/
• 关键词: テラヘルツ; 極限物性科学; 軟X線; 極端紫外; 吸収分光; 軟X線プローブ; 極端紫外スペクトル

We have demonstrated table top terahertz electromagnetic wave source and extreme ultraviolet light source by using a controlled plasma produced by an ultrashort, intense laser pulse and pulse discharge. The terahertz radiation can be generated by the burst current produced by a laser created ionization front, which is induced an optical-field-induced ionization in air with a static electric field. The experimental results behave similarly to calculated results, and electric field amplitude of THz radiation increase with increase in applied voltage of a static electric field. We also have demonstrated a discharge-produced microplasma extreme ultraviolet source based on a pure potassium vapor. Potassium ions produced strong broadband emission around 40nm with a bandwidth of8 nm [full width at half-maximum (FWHM)]. The current-voltage characteristics of microdischarge suggest that the source operates in a hollow cathode mode. By comparison with atomic structure calculations, the broadband emission is found to be primarily due to 3d-3p transitions in potassium ions ranging from K^<2+> to K^<4+>.

我们已经使用了通过超短，强烈的激光脉冲和脉冲放电产生的受控等离子体来证明表顶Terahertz电磁波源和极端的紫外线光源。 Terahertz辐射可以通过激光产生的电离前部产生的爆发电流产生，该电离锋被带有静态电场的空气中的光场诱导的电离。实验结果与计算结果相似，THZ辐射的电场幅度随静态电场的施加电压增加而增加。我们还证明了基于纯钾蒸气的排放产生的微质量极端紫外线源。钾离子在40nm左右产生强大的宽带发射，带宽为8 nm [全宽度为Half-Maximum（FWHM）]。微型递送的电流 - 电压特性表明该源以空心阴极模式运行。通过与原子结构计算相比，发现宽带发射主要是由于钾离子中的3D-3P跃迁，范围从K^<2+>到K^<4+>。

项目成果

Systematic investigation of self-absorption and conversion efficiency of 6.7 nm extreme ultraviolet sources

• DOI: 10.1063/1.3526383
• 发表时间: 2010-12
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: T. Otsuka;D. Kilbane;T. Higashiguchi;N. Yugami;T. Yatagai;Weihua Jiang;A. Endo;P. Dunne;G. O’Sullivan

フラッシュ電離によるテラヘルツ電磁波の周波数変換

通过闪光电离对太赫兹电磁波进行频率转换

• 发表时间: 2011
• 作者: 仲田真大;他
• 通讯作者: 他

Self pulse compression of a 20-mJ energy ultrashort laser in an argon filamentation channel

氩丝通道中 20 mJ 能量超短激光的自脉冲压缩

• 发表时间: 2009
• 作者: Takeshi Higashiguchi;et al.
• 通讯作者: et al.

Property of a hollow cathode discharge-produced microplasma extreme ultraviolet source with alkali metal vapor

碱金属蒸气空心阴极放电微等离子体极紫外光源的特性

• 发表时间: 2010
• 作者: Takeshi Higashiguchi;Hiromitsu Terauchi;Noboru Yugami;Toyohiko Yatagai;Padraig Dunne;Gerry O'Sullivan
• 通讯作者: Gerry O'Sullivan

大気圧ガス媒質中を伝搬する超短パルスレーザーのダイナミクス

常压气体介质中超短脉冲激光传播动力学

• 发表时间: 2009
• 作者: 青木裕之;宇部達;伊藤紳三郎;東口武史
• 通讯作者: 東口武史