In helium, below-threshold harmonics emitted at multiphoton resonances can have ellipticity two or more times larger than the ellipticity of the driving laser.
Young et al., Roadmap of ultrafast x-ray atomic and molecular physics, J
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High-ellipticity resonant below-threshold harmonic generation by a helium atom driven by a moderately intense elliptically polarized laser field
In helium, below-threshold harmonics emitted at multiphoton resonances can have ellipticity two or more times larger than the ellipticity of the driving laser.