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26 January 2019 Watt-level, all-fiber, spectrally flat, and ZBLAN fiber-based MIR supercontinuum extending to 4.6 μm with a record power ratio beyond 3.8 μm
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Abstract
An all-fiber midinfrared supercontinuum with 20-dB spectral coverage from 1.9 to 4.6  μm is demonstrated with a record power ratio beyond 3.8  μm. The supercontinuum is generated in a piece of single-mode ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) fiber pumped by a broadband, single-mode thulium-doped fiber amplifier. Under the optimized pulse repetition rate and ZBLAN fiber length, the output spectrum has a good flatness. The power ratio beyond 3.8  μm is measured to be over 30% when the average output power reaches 1.11 W. Based on the all-fiber configuration, we have provided a compact, reliable, and promising supercontinuum source for further spectral extension into the midinfrared region where a high long-wavelength ratio is preferred.
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$25.00 © 2019 SPIE
Tianyi Wu, Bin Zhang, Zehua Xu, Linyong Yang, and Jing Hou "Watt-level, all-fiber, spectrally flat, and ZBLAN fiber-based MIR supercontinuum extending to 4.6 μm with a record power ratio beyond 3.8 μm," Optical Engineering 58(1), 016111 (26 January 2019). https://doi.org/10.1117/1.OE.58.1.016111
Received: 14 November 2018; Accepted: 8 January 2019; Published: 26 January 2019
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