Details
| Original language | English |
|---|---|
| Publication status | E-pub ahead of print - 10 May 2021 |
Abstract
Keywords
- physics.optics, physics.atom-ph
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2021.
Research output: Working paper/Preprint › Preprint
}
TY - UNPB
T1 - High order Brunel harmonics and supercontinuum formed by a weak optical pump in presence of a strong terahertz field
AU - Babushkin, Ihar
AU - Demircan, Ayhan
AU - Morgner, Uwe
AU - Savel'Ev, A.
PY - 2021/5/10
Y1 - 2021/5/10
N2 - Brunel harmonics appear in the optical response of an atom in process of laser-induced ionization, when the electron leaves the atom and is accelerated in the strong optical field. In contrast to recollision-based harmonics, the Brunel mechanism does not require the electron returning to the core. Here we show that in the presence of a strong ionizing terahertz (THz) field, even a weak driving field at the optical frequencies allow for generating Brunel harmonics effectively. The strong ionizing THz pump suppresses recollisions, making Brunel dominant in a wide spectral range. High-order Brunel harmonics may form a coherent carrier-envelope-phase insensitive supercontinuum, compressible into an isolated pulse with the duration down to 100 attoseconds.
AB - Brunel harmonics appear in the optical response of an atom in process of laser-induced ionization, when the electron leaves the atom and is accelerated in the strong optical field. In contrast to recollision-based harmonics, the Brunel mechanism does not require the electron returning to the core. Here we show that in the presence of a strong ionizing terahertz (THz) field, even a weak driving field at the optical frequencies allow for generating Brunel harmonics effectively. The strong ionizing THz pump suppresses recollisions, making Brunel dominant in a wide spectral range. High-order Brunel harmonics may form a coherent carrier-envelope-phase insensitive supercontinuum, compressible into an isolated pulse with the duration down to 100 attoseconds.
KW - physics.optics
KW - physics.atom-ph
M3 - Preprint
BT - High order Brunel harmonics and supercontinuum formed by a weak optical pump in presence of a strong terahertz field
ER -