Polarization control of quasimonochromatic XUV light produced via resonant high-order harmonic generation

We present a numerical study of the resonant high-harmonic generation by tin ions in an elliptically polarized laser field along with a simple analytical model revealing the mechanism and main features of this process. We show that the yield of the resonant harmonics behaves anomalously with the fundamental field ellipticity, namely, the drop of the resonant harmonic intensity with the fundamental ellipticity is much slower than for high harmonics generated through the nonresonant mechanism. Moreover, we study the polarization properties of high harmonics generated in elliptically polarized field and show that the ellipticity of harmonics near the resonance is significantly higher than for ones far off the resonance. This introduces a prospective way to create a source of the quasimonochromatic coherent XUV with controllable ellipticity potentially up to circular.

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