Diode-pumped mid-infrared fiber laser with 50% slope efficiency

Yigit Ozan Aydin*, Vincent Fortin, Frédéric Maes, Frédéric Jobin, Stuart D. Jackson, Réal Vallée, Martin Bernier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


Until now, the field of mid-infrared fiber laser research has been constrained by the limitation imposed by the Stokes efficiency limit. The conversion of high-power diode light emission operating at near-infrared wavelengths into midinfrared light invariably results in the deposition of significant amounts of heat in the fiber. This issue is compounded by the fact that mid-infrared transmitting glasses are thermomechanically weak, which means scaling the output power has been a longstanding challenge. In this report, we show that by cascading the adjacent transitions of the erbium ion at 2.8 and 1.6 µm in combination with a low-loss fluoride fiber, the slope efficiency for emission at 2.8 µmcan reach 50%, thus exceeding the Stokes limit by 15%.We also show that by highly resonating the 1.6 µm transition, a highly non-resonant excited-state absorption process efficiently recycles the excitation back to the upper laser level of the mid-infrared transition. This demonstration represents a significant advancement for the field that paves the way for future demonstrations that will exceed the 100 W power level.

Original languageEnglish
Pages (from-to)235-238
Number of pages4
Issue number2
Publication statusPublished - 20 Feb 2017


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