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

TL;DR

This paper demonstrates that high harmonic generation from systems with isolated bound states can produce tunable Mollow triplet spectra, revealing internal electronic properties and offering new control over nonlinear optical emissions.

Contribution

It introduces the concept that HHG spectra can be split into Mollow triplets in systems with isolated bound states, which is a novel insight into nonlinear optical responses.

Findings

HHG spectra can form Mollow triplets in certain systems.

Spectral lines are tunable by the driving laser field.

Universal phenomena applicable to various material systems.

Abstract

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