Record power and efficient mid-infrared supercontinuum generation in germania fiber with high stability

Abstract

We report the demonstration of a mid-infrared (MIR) supercontinuum (SC) laser delivering a record-breaking average output power of more than 40 W with a long wavelength edge up to 3.5 μm. The all-fiberized configuration was composed of a thuliumdoped fiber amplifier system emitting broadband spectrum covering 1.9-2.6 μm with pulse repetition rate of 3 MHz, and a short piece of germania fiber. A 41.9 W MIR SC with a whole spectrum of 1.9 to 3.5 μm was generated in a piece of 0.2-m-long germania fiber, with a power conversion efficiency of 71.4%. For an even shorter germania fiber (0.1 m), an SC with even higher output power of 44.9 W (corresponding to a conversion efficiency of 76.5%) was obtained, but the energy conversion towards long wavelength region was slightly limited. A continuous operation for 1 hour with output power of 32.6 W showed outstanding power stability (RMS 0.17%) of the obtained SC laser. To the best of the

Active spectrum tailoring of in-amplifier mid-infrared supercontinuum generation

“…The detailed structure is similar to the supercontinuum laser source structure demonstrated in Ref. [8]. The adopted 1.3-m DDZF has a core diameter of 16 μm and a core NA of 0.12 with a doping concentration of 2000 ppm, and was fusion spliced to the EDZF with a core diameter of 15 μm and a core NA of 0.12.…”

Hundred-watt level all-fiber visible supercontinuum generation from a graded-index multimode fiber

“…The measured value of f 1 is about 128 THz, and the other frequency positions are in good agreement with the simulated ones. Such large frequency shifts will combine with other nonlinear effects, such as soliton-related effects [18][19][20] and stimulated Raman scattering [14,21,22] , to link the visible and near-infrared domain, forming a flat continuum.…”

Theoretical and experimental investigation of Al3+ ion-suppressed phase-separation structures in rare-earth-doped high-phosphorus silica glasses

“…As the core gain medium of fiber lasers, rare-earth (RE)-doped silica-based glasses play an important role in improving the conversion efficiency and output power. [1][2][3][4][5][6] Currently, to reduce the influence of the fluorescence quenching effect, mainstream RE-doped silica-based glasses usually introduce low levels of codopants (e.g. Al, Al-P, F, etc.)…”