Affect Of The Paramenters Of The Synthesized Pluse On Isolated Attosecond Pulse

With the development of laser technology, femtosecond laser pulses have been applied to many fields. But, it can’t be applied to the observation of ultrafast attosecond phenomenon and the transient process, so the realization of attosecond pluse will have significant application prospect. At present, the shortest light pulse obtained in the experiment is80attosecond. The generation of the short pulse requires the use of the incident drive pulse with3.3femtosecond duration. Due to technical difficulties, the energy of the incident drive pulse obtained in the experiment is low, it will lead to the low efficiency of the attosecond pulse. It is difficult for a variety of practical applications. Therefore, we proposed a new method that a single attosecond pulse generation can be obtained by using synthesized pluse with longer duration.In this paper, we solve numerically the one-dimensional time-dependent Schrodinger equation by Crank-Nicolson method, and theoretically investigate affection of the parameters of synthesized pluses with longer duration (wavelength, intensity, pulse width and relative phase et al.) on the high order harmonic generation and single attosecond pluse. We explain the affection of additional pulse wavelength at different waveband on high order harmonic generation for the first time according to the optical oscillation frequency of the synthesized field. Through the analysis of the compression mechanism of the synthesized electric field, we optimize the parameter of the synthesized pulse and obtain isolated attosecond pulse with73as duration. In this paper, we have finished the following main works.First, we illustrate that synthesized pluse with longer duration can be equivalent to the affection of a single short pulse, but overcome the low output of the short pulse.Second, through the analysis of the compression mechanism of the synthesized electric field, we explain the reason that the results from additional infrared pulse is better than that from visible light on the high order harmonic and attosecond pulse generation. In addition, by investigating the parameters of the synthesized pulse, we found that that appropriate increase of the additional pulse intensity is conducive to get shorter attosecond pulse, however, the changes in additional pulse width doesn’t affect the duration of the attosecond pulse. When the relative phase between two pulses is set as zero, we can get the shortest attosecond pulse.Finally, we obtain a73attosecond isolated pulse by selecting the best combination of the parameters.