Details
| Original language | English |
|---|---|
| Article number | 013115 |
| Journal | Physical Review A |
| Volume | 106 |
| Issue number | 1 |
| Publication status | Published - 28 Jul 2022 |
Abstract
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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Physical Review A, Vol. 106, No. 1, 013115, 28.07.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High-order harmonics and supercontinua formed by a weak optical pump in the presence of an extreme terahertz field
AU - Babushkin, I.
AU - Demircan, A.
AU - Morgner, U.
AU - Savel'Ev, A.
N1 - Funding Information: A.S. acknowledges support from the Russian Science Foundation under Project No. 20-19-00148. I.B. and U.M. thank Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), under Projects No. BA 4156/4-2 and No. MO 850-19/2, for support. I.B., A.D., and U.M. acknowledge support from Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project No. 390833453).
PY - 2022/7/28
Y1 - 2022/7/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85135765227&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2105.04627
DO - 10.48550/arXiv.2105.04627
M3 - Article
AN - SCOPUS:85135765227
VL - 106
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 1
M1 - 013115
ER -