Mid-infrared supercontinuum has been widely used in biomedicine, spectroscopy and other fields. The past decade has seen tremendous progress in the field of supercontinuum lasers. In this paper, supercontinuum generation based on a thulium-doped ZBLAN fiber amplifier was achieved. A supercontinuum with spectral coverage of 1.9-3.75 μm and an output power of 1.64 W was achieved in a thulium-doped ZBLAN fiber amplifier. In this paper, we also compare the output of supercontinuum laser in silica-fiber-based and fluoride-fiber-based thulium-doped fiber amplifier respectively with the same seed parameters.
Mid-infrared supercontinuum has been widely used in biomedicine, spectroscopy and other fields. With the development of fluoride fiber, the output power of mid-infrared supercontinuum has gradually increased. In this paper, the supercontinuum generation system of InF3 fiber pumped by a supercontinuum laser with a spectral range of 1.9-2.6 μm is presented. By optimizing the cooling device, the supercontinuum laser with an output power of 26.2 W and an output spectral range of 1.95-4.5 μm is realized. To our knowledge, this is the first report of mid-infrared supercontinuum output with an average power exceeding 20 W in InF3 fiber.
An active spectrum tailoring scheme is proposed and demonstrated in this letter to enhance the energy distribution further towards the long wavelength side. By cascading Dy-doped fluoride fiber to the Er-doped ZBLAN fiber, the residual spectral peak at ~2.8 μm was eliminated, and a spectrally-flat, 3.5-W MIR-SC with power ratio beyond 3 μm up to 91.2% was achieved.
High power supercontinuum (SC) pumped by noise-like pulse (NLP) has become an attractive research topic. In this work, we experimentally demonstrate a high power all-fiber short wavelength infrared SC pumped by amplified 2 μm NLP. The mode-locked structure of NLP seed is based on nonlinear amplifying loop mirror (NALM) with repetition frequency of 6.3 MHz, pulse width of 5.491 ns and maximum output power of 187.2 mW. After amplification of two-stage thulium-doped fiber amplifiers (TDFAs), the obtained SC has spectrum ranging from ~1926 nm to ~2372 nm and the maximum output power of 90 W. As far as we know, this works achieves the highest SC power seeded by 2 μm NLP, demonstrating that the NLP pump has advantages of relatively simple structure and high power in generating SC.
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