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100 1 _ |a Chitgar, Z. M.
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245 _ _ |a Theory of circularly polarized harmonic generation using bi-colour lasers in underdense plasmas
260 _ _ |a Bristol
|c 2021
|b IOP Publ.
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520 _ _ |a Circularly polarized (CP) extreme ultraviolet- and x-ray radiation is an essential tool for analyzing the magnetic properties of materials. Elliptically polarized high harmonic generation (HHG) has been demonstrated by focusing bi-chromatic (800 + 400 nm wavelengths), counter-rotating CP laser pulses into gas targets (Fleischer et al 2014 Nat. Photonics 8 543). More recent theoretical studies indicate that a bi-circular laser driver can also work in both under- and overdense plasmas with analogous selection rules to those in gases: for example, every third harmonic is suppressed and adjacent harmonics have opposite helicity for counter-polarized CP ω0 and 2ω0 pumps. In this work, an analytical theory of bi-circular HHG from underdense plasmas is formulated which provides quantitative predictions of harmonic efficiency scaling, selectivity and helicity for both co- and counter-polarized drivers of arbitrary frequency ratio. This is compared to a fully non-linear, one-dimensional fluid model and particle-in-cell simulations, showing good agreement with both.
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536 _ _ |a Kinetic Plasma Simulation with Highly Scalable Particle Codes (jzam04_20190501)
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700 1 _ |a Greb, C.
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700 1 _ |a Lehrach, A.
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700 1 _ |a Büscher, M.
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773 _ _ |a 10.1088/1361-6587/abd9e1
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|t Plasma physics and controlled fusion
|v 63
|y 2021
|x 1361-6587
856 4 _ |u https://juser.fz-juelich.de/record/891900/files/Chitgar_2021_Plasma_Phys._Control._Fusion_63_035023.pdf
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