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High harmonic generation (HHG) is a highly nonlinear emission process inwhich systems driven by intense laser pulses emit integer multiples (harmonics)of the driving field. This feature is considered universal to all occurrencesof HHG. Here we show that a strong nonlinear response of certain systems cansplit the HHG spectrum into non-harmonic Mollow-type triplets, imprinting theinternal electronic characteristics and confining potential on the HHGspectrum. The spectral lines become tunable by the driver field. Thesephenomena are universal to any material system with isolated bound states. Weidentify the conditions under which our predictions become accessible andpropose experimental systems to observe them.

High Harmonic Generation from Isolated Bound States: Tunable Emission Spectra and Mollow Triplets