scholarly journals Reexamining Different Factors of the Resonance-Enhanced High-Order Harmonic Generation in Atomic and Nanoparticle Laser-Induced Tin Plasmas

2021 ◽  
Vol 11 (5) ◽  
pp. 2193
Author(s):  
Rashid A. Ganeev ◽  
Hiroto Kuroda
Keyword(s):  
Harmonic Generation ◽  
Enhancement Factor ◽  
Near Infrared ◽  
High Order ◽  
High Order Harmonic Generation ◽  
Laser Induced Plasma ◽  
High Order Harmonic ◽  
Resonance Enhancement ◽  
Even Harmonics ◽  
Sn Nanoparticle

We reexamine the resonance enhancement of a single harmonic emission during the propagation of ultrafast pulses through atomic and nanoparticle tin-containing laser-induced plasma (LIP). We compare the single atomic Sn and Sn nanoparticle plasmas to demonstrate a distinction in the enhancement factor of the single harmonic in the case of fixed and tunable near-infrared pulses. The analysis of the dynamics of Sn LIP shows the range of optimal delays between heating and driving pulses (130–180 ns), at which the maximal harmonic yield can be achieved. The enhancements of the 17th and 18th harmonics of 806 nm pulses were analyzed in the case of single-color and two-color pumps of LIP, showing up to a 12-fold enhancement of even harmonics in the two-color pump case. We show the enhancement of a single harmonic in the vicinity of the 4d105s25p2P3/2→4d95s25p2 transitions of Sn II ions and demonstrate how this process depends on the constituency of the plasma components at different conditions of target ablation. The application of tunable (1280–1440 nm) radiation allows for demonstrating the variations of single harmonic enhancement using a two-color pump of Sn-containing LIP.

scholarly journals High-order harmonic generation in laser-produced ions using a near-infrared laser

1995 ◽  
Vol 51 (1) ◽  
pp. 585-591 ◽  
Author(s):  
C.-G. Wahlström ◽  
S. Borgström ◽  
J. Larsson ◽  
S.-G. Pettersson
Keyword(s):  
Harmonic Generation ◽  
Near Infrared ◽  
Infrared Laser ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

scholarly journals Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 610
Author(s):  
Abdelmalek Taoutioui ◽  
Hicham Agueny
Keyword(s):  
Harmonic Generation ◽  
Near Infrared ◽  
High Energy ◽  
High Order ◽  
Single Cycle ◽  
High Order Harmonic Generation ◽  
Displacement Effect ◽  
High Order Harmonic ◽  
Matter Interaction ◽  
Light Matter Interaction

High-order harmonic generation is a nonlinear process that converts the gained energy during light-matter interaction into high-frequency radiation, thus resulting in the generation of coherent attosecond pulses in the XUV and soft x-ray regions. Here, we propose a control scheme for enhancing the efficiency of HHG process induced by an intense near-infrared (NIR) multi-cycle laser pulse. The scheme is based on introducing an infrared (IR) single-cycle pulse and exploiting its characteristic feature that manifests by a non-zero displacement effect to generate high-photon energy. The proposed scenario is numerically implemented on the basis of the time-dependent Schrödinger equation. In particular, we show that the combined pulses allow one to produce high-energy plateaus and that the harmonic cutoff is extended by a factor of 3 compared to the case with the NIR pulse alone. The emerged high-energy plateaus is understood as a result of a vast momentum transfer from the single-cycle field to the ionized electrons while travelling in the NIR field, thus leading to high-momentum electron recollisions. We also identify the role of the IR single-cycle field for controlling the directionality of the emitted electrons via the IR-field induced electron displacement effect. We further show that the emerged plateaus can be controlled by varying the relative carrier-envelope phase between the two pulses as well as the wavelengths. Our findings pave the way for an efficient control of light-matter interaction with the use of assisting femtosecond single-cycle fields.

Relativistic high-order harmonic generation

2003 ◽  
Vol 50 (3-4) ◽  
pp. 375-386
Author(s):  
D. B. MilosÕeviĆ ◽  
W. Becker
Keyword(s):  
Harmonic Generation ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic
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