High-order harmonics and supercontinua formed by a weak optical pump in the presence of an extreme terahertz field

被引：5

作者：

Babushkin, I ^{[1
,2
,3
]}

Demircan, A. ^{[1
,3
]}

Morgner, U. ^{[1
,3
]}

Savelev, A. ^{[4
,5
]}

机构：

[1] Leibniz Univ Hannover, Inst Quantum Opt, Welfengarten 1, D-30167 Hannover, Germany

[2] Max Born Inst, Max Born Str 2a, D-12489 Berlin, Germany

[3] Cluster Excellence PhoenixD Photon Opt & Engn Inn, Welfengarten 1, D-30167 Hannover, Germany

[4] Lomonosov Moscow State Univ, Fac Phys, Leninskie Gory 2, Moscow 119991, Russia

[5] Russian Acad Sci, Lebedev Phys Inst, Leninskii Prospekt 53, Moscow 119991, Russia

来源：

PHYSICAL REVIEW A | 2022年 / 106卷 / 01期

基金：

俄罗斯科学基金会;

关键词：

MULTIPHOTON IONIZATION; GENERATION; PULSES; ELECTRON; NONLINEARITY; INTRABAND; TUNNEL;

D O I：

10.1103/PhysRevA.106.013115

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We show that in the presence of an extreme terahertz (THz) field an additional weak field in the optical frequency range can modulate ionization probability and thereby generate high-order harmonics. The extreme THz pump suppresses recollisions, thereby also fully suppressing the recollision-based harmonics. Nevertheless, high-order harmonics are effectively generated via an alternative mechanism, the so-called Brunel mechanism, based on ionization and subsequent acceleration in the driving field (but not on reabsorption). Using ab initio simulations for the hydrogen atom and short few-cycle optical driver, we show the appearance of a coherent carrier-envelope-phase-insensitive supercontinuum formed by such harmonics, compressible into an isolated pulse with 100-attosecond-scale duration.

引用

页数：9

共 46 条

[1] Damage in a Thin Metal Film by High-Power Terahertz Radiation [J].