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利用遗传算法优化单原子高次谐波场的强度,得到了最优双色激光场的波形.在800~3000 nm波长范围内,该双色场产生高次谐波的转换效率可提高一个数量级以上.进一步模拟了单双色场中单原子和宏观高次谐波场的转换效率随激光波长l的依赖关系.对单原子谐波场而言,波长标度律为λ~(-5)~λ~(-8),与已有结果符合得很好.而宏观谐波谱的强度随激光波长衰减得更快,其标度律为λ~(-8)~λ~(-13).与单色场相比,虽然双色场中的标度律未得到改善,但是谐波转换效率提高很大.
The optimal two-color laser field waveform is obtained by using the genetic algorithm to optimize the intensity of the single-atom harmonic field, and the conversion efficiency of the harmonic generated by the two-color field can be increased more than one order of magnitude in the wavelength range of 800-3000 nm. The dependence of the conversion efficiency of the single-atom and the macro-harmonic field in the single-two-color field with the laser wavelength is further simulated.For the monatomic harmonic field, the wavelength scaling law is λ ~ (-5) ~ λ ~ (-8), which is in good agreement with the previous one, while the intensity of the macroscopic harmonic spectrum decays more rapidly with the laser wavelength, and its scaling law is λ ~ (-8) ~ λ ~ (-13) Compared with the color field, although the two-color field in the scale law has not been improved, but the harmonic conversion efficiency increased greatly.