Miniaturized gain media such as optical chips have enabled the design of compact, rugged, and efficient lasers. The design of such a laser emitting around 2.9 µm and whose gain medium is a fluorozirconate ZBLAN optical chip doped with Ho3+ and Pr3+ is reported here. Pr3+ co-doping overcomes the temporal emission instability we have observed with a chip doped with Ho3+ only , enabling single-frequency and mode-locked operation. Depressed-cladding waveguides were written in the glass chip by ultrafast-laser inscription (ULI) . Multiples waveguides within a single chip provides high mutual coherence between lasers within the same platform  and find numerous applications such as in dual-comb spectroscopy . Moreover, as the measurement of the mid-infrared spectral signature of many gas allows a distinctive way to identify them, the operation wavelength of the presented laser makes it an ideal candidate for mid-infrared spectroscopy. In addition, its compactness strengthens its ability to fulfil the need for portable devices.
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