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000891900 1001_ $$0P:(DE-Juel1)171323$$aChitgar, Z. M.$$b0$$eCorresponding author
000891900 245__ $$aTheory of circularly polarized harmonic generation using bi-colour lasers in underdense plasmas
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000891900 520__ $$aCircularly 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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000891900 536__ $$0G:(DE-Juel1)jzam04_20190501$$aKinetic Plasma Simulation with Highly Scalable Particle Codes (jzam04_20190501)$$cjzam04_20190501$$fKinetic Plasma Simulation with Highly Scalable Particle Codes$$x1
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000891900 7001_ $$0P:(DE-Juel1)130495$$aAdam, R.$$b1
000891900 7001_ $$0P:(DE-Juel1)173666$$aGreb, C.$$b2
000891900 7001_ $$0P:(DE-Juel1)131234$$aLehrach, A.$$b3
000891900 7001_ $$0P:(DE-Juel1)131108$$aBüscher, M.$$b4
000891900 7001_ $$0P:(DE-Juel1)132115$$aGibbon, P.$$b5
000891900 773__ $$0PERI:(DE-600)1473144-7$$a10.1088/1361-6587/abd9e1$$gVol. 63, no. 3, p. 035023 -$$n3$$p035023 -$$tPlasma physics and controlled fusion$$v63$$x1361-6587$$y2021
000891900 8564_ $$uhttps://juser.fz-juelich.de/record/891900/files/Chitgar_2021_Plasma_Phys._Control._Fusion_63_035023.pdf$$yOpenAccess
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