Broadband supercontinuum generation in highly GeO2 doped fibers holds significant appeal for researchers due to their distinct advantages. In this study, we propose employing a low repetition rate noise-like pulse mode-locked fiber laser as the pulse seed for mid-infrared supercontinuum generation in such fibers. Utilizing only one amplifier stage to amplify the noise-like pulse, we achieved a broadband supercontinuum with a 20dB bandwidth spanning from approximately 652nm to 3350nm in a highly GeO2 doped fiber with a core GeO2 concentration of 98%, even with an output power as low as 297mW. To the best of our knowledge, this represents the widest supercontinuum achieved in highly GeO2 doped fibers to date. Additionally, we observed that further increases in pump power resulted in damage to the core of the highly GeO2 doped fibers. This posed a challenge in expanding the spectral range of the output supercontinuum by simply increasing the peak pulse power. This conclusion is of significant reference value for research on supercontinuum generation based on highly GeO2 doped fibers.
We have successfully demonstrated a high-power erbium-doped fluoride glass fiber laser operating at 2.94 μm. The system achieved continuous operation with an output power of 7.1 W at 2.94 μm. The all-fiber Fabry–Perot laser cavity was constructed using an 11.5 m, 7 mol. % Er3+ :ZBLAN fiber with two fiber Bragg gratings (FBG) having reflectivities of 99.7% and 29.2%. These fiber Bragg gratings were inscribed using a 513 nm femtosecond (fs) laser direct-writing technique. To prevent deterioration at high output powers, an endcap was fused at the output fiber end. The system operated at 2.94 μm exhibited an overall slope efficiency of 20.5% in relation to the launched pump power at 980 nm, and demonstrated a single-mode output beam quality with M2 < 1.2.
An all-fiber mid-infrared enhanced supercontinuum laser source, spanning from ~2 μm to ~4.2 μm, was demonstrated in an erbium-doped ZBLAN fiber amplifier. A 2 μm low repetition rate noise like-pulse mode-locked fiber laser was adopted as the pulse seed for the system. Thanks to using a new-type homemade silica-fluoride fiber pump combiner, the 2.8 μm pulses in the supercontinuum were amplified in the erbium-doped ZBLAN fiber amplifier with all-fiber structure. Due to soliton self-frequency shift, long wavelength components were generated and a 1.4 W mid-infrared enhanced supercontinuum with up to 97% of the power beyond 2.7 μm was obtained in the erbium-doped ZBLAN fiber. This research demonstrated a compact and simple in-amplifier mid-infrared supercontinuum generation with all-fiber structure.
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