Abstract
We numerically simulate the high-order harmonic generation in the frequency domain and attosecond pulse generation in the time domain from helium atom irradiated by a tailored MIR femtosecond pulse laser, which is synthesized by a 12 fs/1800 nm/2.71 × 1014 Wcm−2 driving pulse laser and two gating pulse lasers including an 8 fs/1200 nm/1.62 × 1014 Wcm−2 and an 8 fs/800 nm/1.26 × 1014 Wcm−2. This combined pulse has the characteristics of a single-cycle mid-infrared femtosecond pulse with high intensity and stable carrier envelope phase, which current few-cycle MIR femtosecond pulse laser technology can’t qualify. It is found that broadband supercontinuum harmonic spectra with regular plateau structure are generated, and the radiation efficiency of the harmonics is greatly improved compared with the case of a single pulse and two-color optimal synthesize pulses. After inverse Fourier transform, an isolated 66 as pulse with higher intensity can be obtained by superposing supercontinuum harmonics from the 70th to the 515th order. Here, the phase differences between three pulses have little effect on the numerical simulation results when they vary in the range of 0.3π.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.]
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Funding
This work was supported by the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20220101028JC).
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Yin, Y., Sun, J. & Chen, G. Isolated attosecond pulse generation in the water window by tailored MIR femtosecond pulse laser. Eur. Phys. J. D 76, 161 (2022). https://doi.org/10.1140/epjd/s10053-022-00486-4
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DOI: https://doi.org/10.1140/epjd/s10053-022-00486-4