High-Order Harmonic Generation by Two Non-Collinear Femtosecond Laser Pulses in CO
Wang Run-Hai; Jiang Hong-Bing; Yang Hong; Wu Cheng-Yin; Gong Qi-Huang; Wang Run-Hai; Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871; Jiang Hong-Bing; Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871; Yang Hong; Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871; Wu Cheng-Yin; Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871; Gong Qi-Huang; Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871
Журнал:
Chinese Physics Letters
Дата:
2005-08-01
Аннотация:
We have experimentally studied the high order harmonic generation (HHG) in CO molecules by two femtosecond laser pulses using a pump–probe technique. The delay time between two pulses is longer than the pulse duration, and the pump intensity is about 6.2×10<sup>14</sup> W/cm<sup>2</sup>. It is found that the HHG signal is independent of the time delay in the picosecond region, but it is dependent on the distance between the centres of focuses of the two beams. The phase modulation induced by the pump pulse is regarded to be responsible for this.
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