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研究了在紧聚焦实验条件下,采用5 fs激光脉冲与氩气相互作用产生的高次谐波特性.通过优化系统色散、气体靶气压与位置等参数,观察到在60—73 e V波段范围内高次谐波光谱接近一个量级的增强.进一步通过对单原子模型和传播方程的数值求解及模拟相位匹配实验参数下高次谐波的产生过程,发现相位匹配在所观察到的实验现象中起着关键作用,得到了理论上与实验规律一致的结果.
The high-order harmonics generated by the interaction of 5 fs laser pulse with argon gas were studied under the condition of tight focusing experiment. By optimizing the parameters of system dispersion, gas pressure and position of gas target, The harmonic spectrum in the higher order is nearly an order of magnitude enhancement.Further through the numerical solution of the monatomic model and the propagation equation and the generation process of higher order harmonics under the simulated phase matching experimental parameters, it is found that the phase matching is in the observed experimental phenomena Plays a key role in getting the theoretical results consistent with the experimental law.