scholarly journals Numerical Simulation of Femto- and Subfemtosecond Pulse Generation by Spectral Control of High-Order Harmonic Waves.

2000 ◽  
Vol 28 (8) ◽  
pp. 500-505
Author(s):  
Muhammad NURHUDA ◽  
Akira SUDA ◽  
Katsumi MIDORIKAWA
Keyword(s):  
Numerical Simulation ◽  
Pulse Generation ◽  
High Order ◽  
Harmonic Waves ◽  
High Order Harmonic ◽  
Spectral Control

High-order harmonic generation with a single-color mid-infrared laser field by frequency-chirping

2019 ◽  
Vol 33 (13) ◽  
pp. 1950122 ◽  
Author(s):  
Yunhui Wang ◽  
Dandan Song ◽  
Qiang Zuo ◽  
Hong Wu ◽  
Zhihong Yang
Keyword(s):  
Harmonic Generation ◽  
Laser Field ◽  
Infrared Laser ◽  
Pulse Generation ◽  
High Order ◽  
Time Dependent ◽  
Mid Infrared ◽  
High Order Harmonic ◽  
Isolated Attosecond Pulse ◽  
Frequency Chirping

By numerically solving the time-dependent Schrödinger equation for helium atoms in a single mid-infrared laser field, we explore the frequency-chirping effect of laser field on high-order harmonic and isolated attosecond pulse generation. One or two ultrabroad supercontinuum harmonic plateaus can be controlled through modulating the laser field frequency by a small time-dependent signal. Under the best chirping condition, an ultrashort 2.2 as pulse can be obtained by Fourier transformation with the bandwidth of 782 eV. Furthermore, we explain the harmonic generation physical mechanisms by classical ionizing and returning energy maps and time–frequency analyzes.

scholarly journals Macroscopic effects of high-order harmonic and isolated attosecond pulse generation driven by two-color laser field

2011 ◽  
Vol 60 (10) ◽  
pp. 103202
Author(s):  
Lu Ying-Ying ◽  
Zeng Zhi-Nan ◽  
Zheng Ying-Hui ◽  
Zou Pu ◽  
Liu Can-Dong ◽  
...  
Keyword(s):  
Laser Field ◽  
Pulse Generation ◽  
Attosecond Pulse ◽  
High Order ◽  
High Order Harmonic ◽  
Isolated Attosecond Pulse ◽  
Attosecond Pulse Generation

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.

Sign in / Sign up

Export Citation Format

Share Document