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Directly accessing the middle infrared, the molecular functional groupspectral region, via supercontinuum generation processes based on turn-keyfiber lasers offers the undeniable advantage of simplicity and robustness.Recently, the assessment of the coherence of the mid-IR dispersive wave insilicon nitride waveguides, pumped at telecom wavelength, established animportant first step towards mid-IR frequency comb generation based on suchcompact systems. Yet, the spectral reach and efficiency still fall short forpractical implementation. Here, we experimentally demonstrate for the firsttime to our knowledge, that fs-fiber laser driven systems based on large-crosssection silicon nitride waveguides can reach, with powers sufficient to drivedual-comb spectroscopy, the important greenhouse gases spectral region near 4micron, typically accessed through different frequency generation or morecomplex approaches. We show, from a 2 micron femtosecond fiber laser, up to 30%power conversion and milliwatt-level output powers, proving that such sourcesare suitable candidate for compact, chip-integrated spectroscopic and sensingapplications.

Highly efficient 4 micron light generation through fs-fiber laser driven supercontinuum in Si$_3$N$_4$ waveguides