Photonics Research, 2018, 6 (5): 05000417, Published Online: Jul. 6, 2018   

Spectrally flat supercontinuum generation in a holmium-doped ZBLAN fiber with record power ratio beyond 3  μm

Author Affiliations
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
3 Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
Abstract
A spectrally flat mid-infrared supercontinuum (MIR-SC) spanning 2.8–3.9 μm with a maximum output power of 411 mW was generated in a holmium-doped ZBLAN fiber amplifier (HDZFA). A broadband fiber-based SC covering the 2.4–3.2 μm region was designed to seed the amplifier. Benefiting from the broadband seed laser, the obtained SC had a high spectral flatness of 3 dB over the range of 2.93–3.70 μm (770 nm). A spectral integral showed that the SC power beyond 3 μm was 372 mW, i.e., a power ratio of 90.6% of the total power. This paper, to the best of our knowledge, not only demonstrates the first spectrally flat MIR-SC directly generated in fluoride fiber amplifiers, but also reports the highest power ratio beyond 3 μm obtained in rare-earth-doped fluoride fiber until now.

Linyong Yang, Bin Zhang, Ke Yin, Tianyi Wu, Yijun Zhao, Jing Hou. Spectrally flat supercontinuum generation in a holmium-doped ZBLAN fiber with record power ratio beyond 3  μm[J]. Photonics Research, 2018, 6(5): 05000417.

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