Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation
- ICFO—Inst. de Ciencies Fotoniques, Barcelona (Spain)
- Univ. of Salamanca (Spain)
- ICFO—Inst. de Ciencies Fotoniques, Barcelona (Spain); Univ. Autonoma de Madrid (Spain)
- Univ. of Colorado, Boulder, CO (United States)
- ICFO—Inst. de Ciencies Fotoniques, Barcelona (Spain); Passeig de Lluís Companys, Barcelona (Spain)
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 Jγ, by producing high-order harmonics with driving pulses that are invariant under coordinated rotations. Here, we demonstrate that the charge Jγ 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.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-99ER14982; FG02–99ER14982
- OSTI ID:
- 1610408
- Alternate ID(s):
- OSTI ID: 1515108; OSTI ID: 1907873
- Journal Information:
- Physical Review Letters, Vol. 122, Issue 20; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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angular momentum of light
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