Enhancement of High-Order Harmonic Emission and Isolated 7-as Pulse Generation with Rydberg Atoms by Using a Two-Color Laser Field

2012 ◽  
Vol 45 (8) ◽  
pp. 609-615 ◽  
Author(s):  
Hui-Ni Du ◽  
Xiang-Yang Miao
Keyword(s):  
Laser Field ◽  
Rydberg Atoms ◽  
Pulse Generation ◽  
High Order ◽  
Harmonic Emission ◽  
High Order Harmonic

High-order harmonic emission from a three-level atom in a laser field

1999 ◽  
Vol 46 (5) ◽  
pp. 743-754 ◽  
Author(s):  
Pasquale Caldara ◽  
Emilio Fiordilino
Keyword(s):  
Laser Field ◽  
High Order ◽  
Harmonic Emission ◽  
High Order Harmonic ◽  
Level Atom

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

Temporal confinement and enhancement of high-order harmonic emission with a synthesized laser field

2007 ◽  
Vol 75 (5) ◽  
Author(s):  
Hui Xiong ◽  
Ruxin Li ◽  
Zhinan Zeng ◽  
Yinghui Zheng ◽  
Yan Peng ◽  
...  
Keyword(s):  
Laser Field ◽  
High Order ◽  
Harmonic Emission ◽  
High Order Harmonic

THE CARRIER-ENVELOPE PHASE DEPENDENCE OF HIGH-ORDER HARMONIC EMISSION AND ISOLATED ATTOSECOND PULSE GENERATION

2011 ◽  
Vol 10 (02) ◽  
pp. 209-216
Author(s):  
DI YANG ◽  
SHU-LIN CONG
Keyword(s):  
Pulse Generation ◽  
Attosecond Pulse ◽  
High Order ◽  
Phase Dependence ◽  
Time Frequency ◽  
Harmonic Emission ◽  
Carrier Envelope Phase ◽  
High Order Harmonic ◽  
Isolated Attosecond Pulse ◽  
Driving Pulse

We study theoretically the high-order harmonic generation from neon atoms in a two-color laser field, which is synthesized by a 5-fs/800-nm fundamental driving pulse and a 12-fs/1600-nm subharmonic controlling pulse. Numerical simulations show that the harmonic emission is strongly sensitive to the carrier-envelope phase (CEP) of either the fundamental driving pulse or the subharmonic controlling pulse. When neon atoms are driven by such laser pulses with optimal CEP, the generated high-order harmonic spectrum is a supercontinuum that corresponds to single attosecond pulse. The calculation results are explained in terms of the semiclassical "recollison" model and the time-frequency analysis.

High-intensity attosecond pulse generation by using inhomogeneous laser field in frequency and space

2017 ◽  
Vol 26 (03) ◽  
pp. 1750034 ◽  
Author(s):  
Liqiang Feng ◽  
Wenliang Li ◽  
Rich-Samuel Castle ◽  
Yi Li
Keyword(s):  
Frequency Modulation ◽  
High Intensity ◽  
Laser Field ◽  
Pulse Generation ◽  
Attosecond Pulse ◽  
High Order ◽  
Inhomogeneous Field ◽  
High Order Harmonic ◽  
Attosecond Pulse Generation ◽  
Space Modulation

High-order harmonic spectra and attosecond source generation from Ar atom driven by the inhomogeneous laser field in frequency and space have been theoretically investigated. The results showed that (i) for the case of the frequency modulation of the laser, the harmonic cutoff can be remarkably extended with the introduction of the chirp of the laser field, (ii) for the case of the space modulation of the laser, the harmonic cutoff can be further extended by using the positive spatial inhomogeneous field, (iii) by properly adding a terahertz controlling field, the intensity of the harmonic yield can be enhanced by 2 orders of magnitude, showing a 775[Formula: see text]eV supercontinuum. As a result, five isolated attosecond pulses (IAPs) from 60 as to 22 as can be obtained.

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