scholarly journals High-order harmonics from an ultraintense laser pulse propagating inside a fiber

2003 ◽  
Vol 67 (1) ◽  
Author(s):  
S. V. Bulanov ◽  
T. Zh. Esirkepov ◽  
N. M. Naumova ◽  
I. V. Sokolov
Keyword(s):  
Laser Pulse ◽  
High Order

scholarly journals Reconstruction algorithm for tunneling ionization with a perturbation for the time-domain observation of an electric-field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wosik Cho ◽  
Jeong-uk Shin ◽  
Kyung Taec Kim
Keyword(s):  
Laser Pulse ◽  
Electric Field ◽  
Time Domain ◽  
Reconstruction Algorithm ◽  
High Order ◽  
Reconstruction Process ◽  
Tunneling Ionization ◽  
Order Contribution ◽  
High Order Contribution ◽  
The Time Domain

AbstractWe present a reconstruction algorithm developed for the temporal characterization method called tunneling ionization with a perturbation for the time-domain observation of an electric field (TIPTOE). The reconstruction algorithm considers the high-order contribution of an additional laser pulse to ionization, enabling the use of an intense additional laser pulse. Therefore, the signal-to-noise ratio of the TIPTOE measurement is improved by at least one order of magnitude compared to the first-order approximation. In addition, the high-order contribution provides additional information regarding the pulse envelope. The reconstruction algorithm was tested with ionization yields obtained by solving the time-dependent Schrödinger equation. The optimal conditions for accurate reconstruction were analyzed. The reconstruction algorithm was also tested using experimental data obtained using few-cycle laser pulses. The reconstructed pulses obtained under different dispersion conditions exhibited good consistency. These results confirm the validity and accuracy of the reconstruction process.

scholarly journals Cooper minimum of high-order harmonic spectra from an MgO crystal in an ultrashort laser pulse

2020 ◽  
Vol 101 (3) ◽  
Author(s):  
Yiting Zhao ◽  
Xiaoqin Xu ◽  
Shicheng Jiang ◽  
Xi Zhao ◽  
Jigen Chen ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Ultrashort Laser Pulse ◽  
High Order ◽  
High Order Harmonic ◽  
Ultrashort Laser

Spectral redshift of high-order harmonics by adding a weak pulse in the falling part of the trapezoidal laser pulse

2018 ◽  
Vol 27 (2) ◽  
pp. 024206
Author(s):  
Xue-Fei Pan ◽  
Jun Zhang ◽  
Shuai Ben ◽  
Tong-Tong Xu ◽  
Xue-Shen Liu
Keyword(s):  
Laser Pulse ◽  
High Order ◽  
Weak Pulse ◽  
Spectral Redshift

Enhancement of brightness of high-order harmonics with elliptical polarization from near-critical density plasmas irradiated by an ultraintense laser pulse

2020 ◽  
Vol 27 (8) ◽  
pp. 083101
Author(s):  
Yan Jiang ◽  
Qing Wang ◽  
Lihua Cao ◽  
Zhanjun Liu ◽  
Chunyang Zheng ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Critical Density ◽  
High Order ◽  
Elliptical Polarization

Bayesian approach for the optimal control of high-order harmonics for the generation of ultrashort attosecond laser pulses

2021 ◽  
Author(s):  
Wei-Teng Wang ◽  
Yae-Lin Sheu ◽  
Shih-I Chu
Keyword(s):  
Laser Pulse ◽  
Laser Field ◽  
Pseudospectral Method ◽  
Laser Pulses ◽  
Optimization Method ◽  
High Order ◽  
Time Dependent ◽  
Bayesian Optimization ◽  
Time Frequency ◽  
Isolated Attosecond Pulse

Abstract We present an efficient and powerful method to optimize the production of high-order harmonic generation (HHG) and ultrashort single attosecond laser pulses. The system under investigation is the helium atoms that are exposed to the combination of chirped two-color mid-IR laser field and its 34th harmonic. The time-dependent Schrödinger equation is solved accurately and efficiently by means of the time-dependent generalized pseudospectral method and the time-frequency spectrum is obtained by the wavelet transform. We extend the machine-learning based optimization method, called Bayesian optimization (BO), to optimize the incident laser pulse to generate ultrashort attosecond laser pulse successfully for the first time. It is shown that the intensity of HHG power spectrum from the plateau region to the cutoff is enhanced by the optimized laser field by several orders of magnitude. Further, an ultrafast isolated attosecond pulse of 10 attosecond can be generated efficiently by superposing the plateau harmonics.

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