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We introduce two-color counterrotating circularly polarized laser fields as anew way to spectrally control high harmonic generation (HHG) from relativisticplasma mirrors. Through particle-in-cell simulations, we show that only aselected group of harmonic orders can appear owing to the symmetry of the laserfields and the related conservation laws. By adjusting the intensity ratio ofthe two driving field components, we demonstrate the overall HHG efficiency,the relative intensity of allowed neighboring harmonic orders, and thepolarization state of the harmonic source can be tuned. The HHG efficiency ofthis scheme can be as high as that driven by a linearly polarized laser field.

Spectral control of high harmonics from relativistic plasmas using bicircular fields