产生短波长高次谐波条件的优化计算
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摘要: 从电离的几率方程出发，得到了适用于任意激光脉冲宽度下原子的饱和激光强度和最高次光谐波光子能量与各激光参数的关系表达式，并由此给出了产生高次谐波的优化条件。解决了当超短脉冲激光的脉冲宽度小于皮秒时，产生高次谐波（HHG）的隧道电离理论中的Ammosov－Delone－Krainov方法对产生高次谐波的饱和激光强度以及最高次谐波光子能量的估算不可靠的问题。Abstract: It is not reliable to estimate the saturation laser intensity and the photon energy for the highest order harmonic using Ammosov-Delone-Kraimov(ADK) tunneling ionization theory in generation of high order harmonic when pulse duration of drive laser is shorter than picosecond. In this paper, new expressions for the saturation laser intensity and the photon energy for the highest order harmonic for an arbitrary laser pulse duration have been derived. Based on the expressions, the optimized parameters have been achieved to generate high order harmonic.
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Key words:
- high harmonic /
- ultrashort pulse
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