双色场相位平缓对远场前向太赫兹的增强

CORC > 上海光学精密机械研究所 > 中国科学院上海光学精密机械研究所 > 强场激光物理国家重点实验室

	双色场相位平缓对远场前向太赫兹的增强
	白亚 ; 许荣杰 ; 宋立伟 ; 刘鹏 ; 李儒新 ; 徐至展
刊名	红外与激光工程
	2014
卷号	43 期号:8 页码:2656
关键词	双色场相位 Gouy相移失相长度太赫兹辐射
其他题名	Enhanced far field terahertz in forward direction due to relative phase flatten of two-color field
通讯作者	白亚, 中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海 201800, 中国. ; 许荣杰, 中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海 201800, 中国. ; 宋立伟, 中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海 201800, 中国. ; 刘鹏, 中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海 201800, 中国. ; 李儒新, 中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海 201800, 中国. ; 徐至展, 中国科学院上海光学精密机械研究所, 强场激光物理国家重点实验室, 上海 201800, 中国.
中文摘要	太赫兹辐射极性和幅度依赖于双色场相位。由于等离子体光丝中色散和Gouy相移，导致双色场的相对相位随着激光的传播发生改变。当相位的改变量大于pi时，丝中的太赫兹电场极性发生反转，使得远场太赫兹辐射在离轴相位匹配角方向相干增强，而光轴前向相消减弱。通过对基频和倍频聚焦条件的调整和传输非线性色散的作用对双色场相对相位进行了调制，提出了可以使相对相位平缓的方法。模型计算证明了等离子体形成和Gouy相移调制是使双色场相移变平缓的原因。随后利用相位变平缓的条件得到了太赫兹发生极性反转的失相长度延长，最大长度近三倍于空气介质中的失相长度。在满足相位变平的条件下，远场太赫兹辐射在光轴前向的分布得到增强。
英文摘要	Pumped by two-color field, generated THz field amplitude and polarity depend on relative phase between two frequencies. Due to dispersion in plasma filament and Gouy phase shift, relative phase of two-color field varies along laser propagation direction. As the phase changed by pi, local THz field in filament got polarity reversal, far field THz constructive enhanced in off-axis direction, while destructive interference in forward direction. By adjusting the focusing geometry for two frequencies and through nonlinear dispersion in plasma filament the relative phase of two-color field was modulated. It was found that the relative phase flattens by the plasma formation and the conditions of focusing geometry. The dephasing length of THz fields that maintaining its polarity was elongated, with maximum value three times larger than dephasing length in ambient air. The far field THz radiation was enhanced in forward direction near the propagation axis.
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:5229943
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.siom.ac.cn/handle/181231/12570]
专题	上海光学精密机械研究所_强场激光物理国家重点实验室
作者单位	1.Bai Ya, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. 2.Xu Rongjie, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. 3.Song Liwei, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. 4.Liu Peng, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. 5.Li Ruxin, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. 6.Xu Zhizhan, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
推荐引用方式 GB/T 7714	白亚,许荣杰,宋立伟,等. 双色场相位平缓对远场前向太赫兹的增强[J]. 红外与激光工程,2014,43(8):2656.
APA	白亚,许荣杰,宋立伟,刘鹏,李儒新,&徐至展.(2014).双色场相位平缓对远场前向太赫兹的增强.红外与激光工程,43(8),2656.
MLA	白亚,et al."双色场相位平缓对远场前向太赫兹的增强".红外与激光工程 43.8(2014):2656.