Quasi-phase matching of harmonics generating in laser plasmas: experiment and theory

Sergey Stremoukhov,Anatoli Andreev,Rashid Ganeev,S Arakelyan,A Kalachev,A Evlyukhin,A Naumov

doi:10.1051/epjconf/201922001013

Sergey Stremoukhov, Anatoli Andreev + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201922001013

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Abstract

We compare the results of experimental and theoretical studies of the quasi-phase matching (QPM) of high-order harmonic generation (HHG) during propagation of two-color femtosecond pulses through the indium multi-jet plasmas. The role of number of coherent zones and size of plasma jets on the HHG efficiency at QPM conditions is analysed. We demonstrate the enhancement of the HHG efficiency due to QPM during laser-plasma interaction.

Highlights

In the study of quasi-phase matching (QPM) conditions it is usually assumed that the target is in some fixed state with some given degree and level of ionization
This approximation is more or less suitable to describe the propagation of the driving laser wave, it is not suitable to describe the interaction of harmonics with plasmas, since harmonics are emitted in different spatial points of nonlinear optical medium during the whole action of driving laser field
The model that takes into account the propagation of the driving laser field and at the same time includes the quantum mechanical description of atomic electron evolution at QPM conditions has recently been proposed in Ref. [6]

Summary

Introduction

In the study of QPM conditions it is usually assumed that the target is in some fixed state with some given degree and level of ionization. The model that takes into account the propagation of the driving laser field and at the same time includes the quantum mechanical description of atomic electron evolution at QPM conditions has recently been proposed in Ref. The model was applied to study the QPM conditions in perforated silver plasma [7].

Results

Conclusion