Generation ofintense harmonics in the water window bytwo-color field and its applications

双色场产生水窗强谐波及其应用

• 批准号: 17206009
• 负责人: WATANABE Shuntaro
• 金额: $ 31.95万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206009/
• 关键词: high harmonics; water window; ultrashort pulse; soft x-ray; two-color field; attosecond pulse

The achievements for these 3 years are summarized as follows.(1) The significant enhancement of harmonics and the extension of cut off were observed below 10 run by two Color field. The harmonics in the water window (4. 4〜2. 3 nm) were confirmed by the fundamental field alone.(2) By controlling the relative phase between two fields, the lower and upper branches were clearly separated. The results were explained by the calculated atomic dipole moment from time-dependent Schrodinger equation.(3) A 5-fs. TW-class, carrier-envelope-phase-stabilized optical parametric chirped-pulse amplification (OPCPA) system was developed to generate intense harmonics in the water window. The pulse width of 5. 5 fs was the shortest and the average power of 2. 5 W at 1 kHz was the highest ever obtained by OPCPA(4) An ultra-high resolution laser-photoelectron spectrometer was developed. The resolution of 150 μeV is the highest ever obtained. The various superconductor materials were investigated by using this system. In the near future, a few tens of attosecond pulses will be realized in the water window by two-color field of a newly developed OPCPA system.

现将这三年来的成就总结如下。(1)两种色场在10 nm以下均观察到谐波的显著增强和截止值的延长。水窗中的谐波（4.四块二。3 nm）的光场强度。(2)通过控制两个场之间的相对相位，上下分支被清楚地分开。用含时薛定谔方程计算的原子偶极矩解释了上述结果。(3)一个5-fs。为了在水窗内产生强谐波，研制了TW级载波包络稳相光参量啁啾脉冲放大（OPCPA）系统。脉冲宽度为5。5 fs是最短的，平均功率为2。（4）研制了超高分辨激光光电子能谱仪。150 μeV的分辨率是迄今为止获得的最高分辨率。利用该系统对各种超导材料进行了研究。在不久的将来，利用新研制的OPCPA系统的双色场，将在水窗内实现几十个阿秒脉冲。

项目成果

極端紫外単-アト秒パルス光の波形・位相同時測定

极紫外单阿秒脉冲光波形和相位的同时测量

• 发表时间: 2008
• 期刊: レーザー研究 36
• 作者: 小菅淳;渡部俊太郎
• 通讯作者: 渡部俊太郎

Simultaneous measurement of pulse shape and phase of isolated attosecond pulses in the extreme ultraviolet

极紫外中孤立阿秒脉冲的脉冲形状和相位的同时测量

• 发表时间: 2008
• 期刊: The review of laser engineering 36
• 作者: A. Kosuge;S. Watanabe
• 通讯作者: S. Watanabe

Recent progress in the technique of ultrashort-pulse generation

超短脉冲产生技术的最新进展

• 发表时间: 2007
• 期刊: OYOBUTURI 76・2
• 作者: S. Watanabe;S. Adachi
• 通讯作者: S. Adachi

1. 5-mJ, 6. 4-fs OPCPA system at 1 kHz

1. 5-mJ，6. 4-fs OPCPA 系统（1 kHz）

• 发表时间: 2007
• 作者: S. Adachi;H. Ishii;T. Kanai;N. Ishii;A. Kosuge;S. Watanabe
• 通讯作者: S. Watanabe

Generation of high average power, 7.Sfs-blue pulses at 5kHz by adaptivephase control

通过自适应相位控制生成 5kHz 的高平均功率 7.Sfs 蓝色脉冲

• 发表时间: 2005
• 作者: X. Zhou;T. Kanai;T. Sekikawa and S. Watanabe
• 通讯作者: T. Sekikawa and S. Watanabe