In this work, Mitrofanov and coauthors report the observation of the inverse scattering effect, causing loss instead of gain and less common than its canonical counterpart, in a novel scenario of strong-field physics. By pumping a nitrogen-filled gas cell with ultrashort pulses of 3.9 μm central wavelength, they observed the emission of high-order harmonics reaching the ultraviolet. Remarkably, careful inspection of the spectral features of the 11th harmonic lying in the vicinity of a prominent transition of nitrogen at 337 nm revealed signatures of both Raman-induced gain and loss on both sides of the ultraviolet pump. These interesting results and their potential applications will certainly open new horizons in the aforementioned fields in the years to come.
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