【摘要】 从薛定谔方程和激光场、谐波场的传播方程组成的自洽模型出发,采取了一种简化模型,数值模拟了超强超短激光脉冲与充有较高压强的惰性气体在周期调制光纤中的高次谐波输出。计算结果表明,较高次谐波的转换效率得到增强,与实验结果相一致,从而验证了简化模型的可行性。在此基础上,引入了线性啁啾调制光纤,通过进一步的理论模拟,发现在线性啁啾调制光纤中,高次谐波的效率可得到进一步提高,同时也有利于产生脉宽窄的单阿秒脉冲。更多还原

【Abstract】 Based on a self-consistent model including time-dependent Schro¨dinger equation and scalar wave equations for the laser field and the harmonic field,a simplified method is adopted to carry out the numerical simulation of high-order harmonic output at the inert gas with high pressure from ultra-short intense laser in the periodic modulated hollow fiber.The calculated results indicate that the conversion efficiency of the high-order harmonics is enhanced,being in coincidence with experimental results,whereby the feasibility of the simplified model is tested,on the basis of which,the chirped modulated hollow fiber is introduced.It is found via the further theoretical simulation that the efficiency of the high-order harmonics in the linear chirped modulated hollow fiber can be further improved and that at the same time,the single attosecond pulse can be easily generated.更多还原