Effect of laser intensity on quantum trajectories in the macroscopic high-order harmonic generation<xref rid="cpb_28_11_113201fn1" ref-type="fn">*</xref><fn id="cpb_28_11_113201fn1"><label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11627807, 11774175, 11534004, 11774129, and 11604119), the Fundamental Research Funds for the Central Universities of China (Grant No. 30916011207), the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20170101153JC), and the Science and Technology Project of the Jilin Provincial Education Department, China (Grant No. JJKH20190183KJ).</p></fn>

Effect of laser intensity on quantum trajectories in the macroscopic high-order harmonic generation**

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11627807, 11774175, 11534004, 11774129, and 11604119), the Fundamental Research Funds for the Central Universities of China (Grant No. 30916011207), the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20170101153JC), and the Science and Technology Project of the Jilin Provincial Education Department, China (Grant No. JJKH20190183KJ).

Pan Yun^{1, 2}, Guo Fuming^{1, 2}, Yang Yujun^{1, 2, †}, Ding Dajun^{1, 2}

Evolution of the time–frequency profiles of harmonic emissions along the direction of laser propagation. The laser intensities and gas densities are as follows: (a)–(d) 2 × 10¹⁴ W/cm², 1.815 × 10²⁵ atoms/m³, (e)–(h) 8 × 10¹⁴ W/cm², 1.155 × 10²⁵ atoms/m³, (i)–(l) 8 × 10¹⁴ W/cm², 2.474 × 10²⁵ atoms/m³. The harmonic efficiency of each position is independently normalized, and the normalization coefficient is given in the lower left corner.