Isolated sub-30-as pulse generation from few-cycle spatially inhomogeneous laser pulses

We investigate theoretically the high-order harmonic generation from few-cycle spatially inhomogeneous laser pulses. It is found that the cutoff of the high-order harmonic spectrum extends dramatically compared with that from homogeneous pulse. With proper inhomogeneous parameters, a broad continuum spectrum appears, from which an isolated attosecond pulse with duration less than 30as could be obtained without any phase compensation. The duration of generated attosecond pulse is not sensitive to the variation of the carrier-envelop phase of the driver field, which may be beneficial to the realization in experiment.

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Two states hydrogenlike model for high-order harmonic generation and an isolated attosecond pulse generation in a He+ ion

Optics Communications ◽

10.1016/j.optcom.2012.11.063 ◽

2013 ◽

Vol 296 ◽

pp. 113-123 ◽

Cited By ~ 17

Author(s):

Masoud Mohebbi ◽

Saeed Batebi

Keyword(s):

Harmonic Generation ◽

Pulse Generation ◽

Attosecond Pulse ◽

High Order ◽

High Order Harmonic Generation ◽

High Order Harmonic ◽

Isolated Attosecond Pulse ◽

Attosecond Pulse Generation

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Initial state effect on waveform control of high-order harmonic spectrum and attosecond pulse generation

Modern Physics Letters B ◽

10.1142/s0217984921503668 ◽

2021 ◽

pp. 2150366

Author(s):

Hang Liu ◽

Xiaodan Jing ◽

Yan Qiao ◽

John McCain ◽

Liqiang Feng

Keyword(s):

Harmonic Spectrum ◽

Pulse Generation ◽

Attosecond Pulse ◽

High Order ◽

High Order Harmonic Generation ◽

Initial State ◽

High Order Harmonic ◽

Waveform Control ◽

Attosecond Pulses ◽

Attosecond Pulse Generation

In this paper, the waveform control of high-order harmonic generation and attosecond pulse generation from a different initial state of He atom has been investigated. The results show that (i) by properly controlling the carrier-envelope phases, the time delays and the laser intensities of a 3-color laser pulse, the best waveforms for the harmonic cut-off extension can be found. Although the harmonic cut-offs from the ground initial state and the superposition initial state are almost the same, the harmonic intensities from the superposition initial state are 4 to 5 orders of magnitudes higher than those from the ground initial state. (ii) With the introduction of the inhomogeneous effect, the harmonic cut-offs can be further extended. However, the harmonic intensities from the superposition initial state are remarkably decreased compared with those from the homogeneous pulses, which is unbeneficial to generate the intense attosecond pulses. (iii) When the ground state is chosen to be the initial and with the assistance of the 4th UV pulse, not only the larger harmonic cut-offs can be obtained, but also the stronger harmonic plateaus can be found, which is favorable for producing the intense attosecond pulses. Thus, at the end of this paper, by superposing the harmonics from the best harmonic spectra, the single attosecond pulses with the duration of 36 as can be obtained.

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