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High-order harmonic generation of a united-atom model irradiated by combined laser pulses

The dynamic behavior of a P-T potential model atom exposed to particularly designed laser pulses has been carefully analyzed by employing the classical "three-step model" theory.We present a high-order harmonic generation(HHG) spectrum from a united-atom system exposed to the laser pulses mentioned above,the emission efficiencies of the harmonics near the cutoff(I_p+8U_p) are especially enhanced to 10~(-9).It is shown that the amplitudes,the phases of the combined lasers,and the inter-nuclear separation are crucial factors in obtaining the high efficiency of the HHG.