A strong single attosecond pulse generation from an atomic superposition state with chirped laser fields

作者：Mohebbi Masoud^*

来源：Optik, 2014, 125(15): 3818-3821.

DOI：10.1016/j.ijleo.2014.01.180

• High-order harmonic generation
• Isolated attosecond pulse
• Chirped laser field
• Coherent states

We numerically investigate the chirp-depending of supercontinuum generation with preparing He+ ions in a coherent superposition of the states is and 2s. The results show that the initial population of the 2s state can lead to the formation of intense supercontinuum in spectrum. By precise control of chirp parameter, the spectral width and intensity of supercontinuum harmonics increase. Moreover, with a synchronous decrease of pulse durations, the bandwidth of the intense supercontinuum increases. The time frequency characteristic of harmonics reveals that the long quantum-path is dominated in supercontinuum-region. As a result, an intense 7-as isolated pulse with a bandwidth of 570eV can be achieved.

• 出版日期2014