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Solitons propagating in media with higher order dispersion will shedradiation known as dispersive wave or resonant radiation, with applications infrequency broadening, deep UV sources for spectroscopy or simply fundamentalstudies of soliton physics. Starting from a recently proposed equation thatmodels the behaviour of ultrashort optical pulses in nonlinear materials usingthe analytic signal, we find that the resonant radiation associated with thethird-harmonic generation term of the equation is parametrically stimulatedwith an unprecedented gain. Resonant radiation levels, typically only a smallfraction of the soliton, are now as intense as the soliton itself. Themechanism is quite universal and works also in normal dispersion and withharmonics higher than the third. We report experimental hints of thissuper-resonant radiation stimulated by the fifth harmonic in diamond.

Super-resonant radiation stimulated by high-harmonics