TY - JOUR
AU - Emilio Pisanty
AU - Laura Rego
AU - Julio San Román
AU - Antonio Picón
AU - Kevin Dorney
AU - Henry Kapteyn
AU - Margaret Murnane
AU - Luis Plaja
AU - Maciej Lewenstein
AU - Carlos Hernández-García
AB - High-order harmonic generation stands as a unique nonlinear optical up-conversion process, mediated by a laser-driven electron recollision mechanism, which has been shown to conserve energy, linear momentum, and spin and orbital angular momentum. Here, we present theoretical simulations that demonstrate that this process also conserves a mixture of the latter, the torus-knot angular momentum  Jy, by producing high-order harmonics with driving pulses that are invariant under coordinated rotations. We demonstrate that the charge Jy of the emitted harmonics scales linearly with the harmonic order, and that this conservation law is imprinted onto the polarization distribution of the emitted spiral of attosecond pulses. We also demonstrate how the nonperturbative physics of high-order harmonic generation affect the torus-knot angular momentum of the harmonics, and we show that this configuration harnesses the spin selection rules to channel the full yield of each harmonic into a single mode of controllable orbital angular momentum.
BT - Phys. Rev. Lett.
DA - 2019-05
DO - 10.1103/PhysRevLett.122.203201
N2 - High-order harmonic generation stands as a unique nonlinear optical up-conversion process, mediated by a laser-driven electron recollision mechanism, which has been shown to conserve energy, linear momentum, and spin and orbital angular momentum. Here, we present theoretical simulations that demonstrate that this process also conserves a mixture of the latter, the torus-knot angular momentum  Jy, by producing high-order harmonics with driving pulses that are invariant under coordinated rotations. We demonstrate that the charge Jy of the emitted harmonics scales linearly with the harmonic order, and that this conservation law is imprinted onto the polarization distribution of the emitted spiral of attosecond pulses. We also demonstrate how the nonperturbative physics of high-order harmonic generation affect the torus-knot angular momentum of the harmonics, and we show that this configuration harnesses the spin selection rules to channel the full yield of each harmonic into a single mode of controllable orbital angular momentum.
PB - American Physical Society
PY - 2019
EP - 203201
T2 - Phys. Rev. Lett.
TI - Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation
UR - https://link.aps.org/doi/10.1103/PhysRevLett.122.203201
VL - 122
ER -