光学学报, 2015, 35 (s1): s132002, 网络出版: 2015-07-27  

梯度密度成丝理论研究

Study on Controlling the Filament by Gradient Density Method
作者单位
1 天津工业大学理学院物理系(研究所),天津 300387
2 天津职业技术师范大学天津市现场总线控制技术中心,天津 300222
摘要
将梯度气压和梯度温度统一归为梯度密度,从而提出了梯度密度的概念,从理论上讨论了梯度密度对于超强飞秒(fs)脉冲成丝和等离子体通道形成和演化过程的影响。进一步提出了理想密度曲线的概念,并且对于各种不同情况下的理想密度曲线进行了计算和分析。在理想密度曲线下传输的脉冲能在避免多丝的情况下得到最大限度的非线性作用和光谱展宽,从而有望使得压缩后得到的脉冲宽度更短。对理想密度曲线下传输的实质进行了分析和解释,指出在理想密度曲线下传输的实质是保持n2Pc的恒定,在避免自聚焦或者电离的情况下,能使得光脉冲光斑半径在保持一定范围内长距离传输,并且形成一种自波导。
Abstract
The gradient pressure and temperature are unified into gradient density, the characteristics of femtosecond filamentation is investigated and the plasma channel in gases with gradient density is accompanied, the feasibility of gradient density method to enlarge the length of the filament and plasma channel is studied. Furthermore, the concept of ideal density curve is presented. The ideal shapes of gradient density under different conditions are calculated and analysized. The femtosecond pulses which propagate under the ideal gradient density curve can achieve the maximum spectra broadening and shorter pulses after compression while avoiding the muti-filament. It is found that the nature of intense femtosecond pulses propagation under the ideal density curve is in the condition of maintain constant n2Pc, to make the spot radius of the pulse at certain range in the long distance propagation, and to perform a self-guide while avoiding the self focusing or ionization.

宋振明, 赵晗, 林俞先, 倪晓昌. 梯度密度成丝理论研究[J]. 光学学报, 2015, 35(s1): s132002. Song Zhenming, Zhao Han, Lin Yuxian, Ni Xiaochang. Study on Controlling the Filament by Gradient Density Method[J]. Acta Optica Sinica, 2015, 35(s1): s132002.

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