Intensity improvement in the attosecond pulse generation with the coherent superposition initial state

2012 ◽  
Vol 376 (17) ◽  
pp. 1523-1530 ◽  
Author(s):  
Liqiang Feng ◽  
Tianshu Chu
Keyword(s):  
Pulse Generation ◽  
Attosecond Pulse ◽  
Initial State ◽  
Coherent Superposition ◽  
Attosecond Pulse Generation

Intense Isolated Short Attosecond Pulse Generation from a Coherent Superposition State in a Spatially Inhomogeneous Field

2018 ◽  
Vol 73 (4) ◽  
pp. 303-313
Author(s):  
Gangtai Zhang ◽  
Tingting Bai
Keyword(s):  
Excited States ◽  
Harmonic Spectrum ◽  
Pulse Generation ◽  
Spatial Inhomogeneity ◽  
Inhomogeneous Field ◽  
Superposition State ◽  
Initial State ◽  
Coherent Superposition ◽  
Spatially Inhomogeneous ◽  
Attosecond Pulse Generation

AbstractWe theoretically present an efficient method of generating an intense isolated short attosecond (as) pulse in a spatially inhomogeneous field. It is shown that this spatiotemporally combined field can significantly extend the harmonic cut-off and enhance the harmonic efficiency when the initial state is a coherent superposition of the ground and excited states. Then, a highly efficient continuum spectrum with an extremely wide bandwidth is directly generated. Due to the introduction of the spatial inhomogeneity, the short path is selected and the long one is removed; as a result, an intense isolated 17.3-as pulse is obtained straightforwardly. In addition, we also investigate the influences of the parameters including the population of the excited state, spatial inhomogeneity, carrier–envelope phase, pulse duration, and intensity on the harmonic spectrum.

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

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.

Research Progress of Attosecond Pulse Generation and Characterization （Invited）

2021 ◽  
Vol 50 (1) ◽  
pp. 1-25
Author(s):  
王虎山 Hushan WANG ◽  
曹华保 Huabao CAO ◽  
皮良文 Liangwen PI ◽  
黄沛 Pei HUANG ◽  
王向林 Xianglin WANG ◽  
...  
Keyword(s):  
Pulse Generation ◽  
Attosecond Pulse ◽  
Research Progress ◽  
Attosecond Pulse Generation

scholarly journals Influence of generalized focusing of few-cycle Gaussian pulses in attosecond pulse generation

2013 ◽  
Vol 21 (21) ◽  
pp. 24991 ◽  
Author(s):  
Ebrahim Karimi ◽  
Carlo Altucci ◽  
Valer Tosa ◽  
Raffaele Velotta ◽  
Lorenzo Marrucci
Keyword(s):  
Pulse Generation ◽  
Attosecond Pulse ◽  
Attosecond Pulse Generation

Isolated-attosecond-pulse generation by suppressing multiple rescatterings with plasmon-enhanced laser fields

2017 ◽  
Vol 50 (3) ◽  
pp. 176-182 ◽  
Author(s):  
Yi-Na Zheng ◽  
Cai-Ping Zhang ◽  
Hui-Fang Cui ◽  
Xiao-Hu Xu ◽  
Chang-Long Xia ◽  
...  
Keyword(s):  
Pulse Generation ◽  
Attosecond Pulse ◽  
Laser Fields ◽  
Isolated Attosecond Pulse ◽  
Attosecond Pulse Generation
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