Mid-IR supercontinuum generation in a ZBLAN fiber pumped by a gain-switched mode-locked Tm-doped fiber laser and amplifier system

Optics Express (Impact Factor: 3.53). 04/2013; 21(7):7851-7. DOI: 10.1364/OE.21.007851
Source: PubMed

ABSTRACT We demonstrate a novel method of mid-infrared (mid-IR) supercontinuum (SC) generation with the use of a 2 µm gain-switched self-mode-locked thulium-doped fiber laser. SC radiation ranging from ~1.9 to 3.8 µm wavelength, generated in a single-mode ZBLAN fiber with a zero-dispersion wavelength (ZDW) shifted to ~1.9 µm, is reported. An average output power of 0.74 W with 0.27 W at wavelengths longer than 2.4 µm was measured. It is, to the best of our knowledge, the first report on such an approach to generate a mid-IR SC in optical fibers.

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    ABSTRACT: Mid-infrared supercontinuum generation (SCG) is mostly studied in fluoride glass fibers in which long fibers and high power pump sources are needed. Taking advantages of high nonlinearity and transparency, chalcogenide glass is also applied for SCG in mid-infrared region, where specific strategy is needed to compensate large normal material dispersion. We investigate multimaterial fibers (MMFs) combined with fluoride and chalcogenide glasses for SCG. The high refraction contrast allows the zero dispersion point of the fiber to shift to below 2 μm without air holes. These two materials have similar glass transition temperatures and thermal expansion coefficients. They are possible to be drawn together. Both step-index MMFs and microstructured MMFs (MS-MMFs) are considered. The chromatic dispersions and supercontinuum spectra are studied. A 20 dB bandwidth of over one octave SCG with high coherence can be obtained from a 1 cm MS-MMF at 1.95 μm with a pumping peak power of 175 W. As the pump power increased, the spectrum can extend to 5 μm. In this scheme the fiber is so short that the high level of loss, which is the feature of MMFs, will not cause problems.
    Optics Express 10/2014; 22(20). DOI:10.1364/OE.22.024179 · 3.53 Impact Factor
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    ABSTRACT: We report high power mid-infrared (mid-IR) supercontinuum (SC) generation in a single-mode ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) fiber with up to 21.8 W average output power from 1.9 to beyond 3.8 μm pumped by amplified picosecond pulses from a single-mode thulium-doped fiber (TDF) master oscillator power amplifier (MOPA). The optical-optical conversion efficiency from the 793 nm pump laser of the last stage thulium-doped fiber amplifier (TDFA) to mid-IR SC output is 17%. It is, to the best of our knowledge, the highest average power mid-IR SC generation from a ZBLAN fiber to date.
    Optics Express 10/2014; 22(20). DOI:10.1364/OE.22.024384 · 3.53 Impact Factor
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    ABSTRACT: We report for the first time the successful fabrication, using advanced stack-and-draw techniques, of a ZBLAN glass (ZrF4-BaF2-LaF3-AlF3-NaF) photonic crystal fiber (PCF) with sub-micron features and large air-filling fraction [1]. With the capability of strongly modifying dispersion landscape in such a fiber, a 10 dB-flat, close to three-octave-wide supercontinuum (350 to 2500 nm) generated from 140 fs, 1 nJ pulses at 1042 nm by using an Yb3+-doped KYW laser. Compared to previous work on supercontinuum generation in all-solid step-index ZBLAN fibers, which required pumping with pulse in the μJ or even mJ range due to low effective nonlinearity and non-ideal dispersion landscape, our recent investigation represents a significant advance over previous studies [2]. High-quality ZBLAN PCFs open up remarkable possibilities for the generation of ultra-broadband supercontinua. In addition, ZBLAN glass also is an excellent host for rare-earth ions, suggesting the possibility of developing mid-infrared light amplifiers and coherent sources.
    The Rank Prize Funds: Symposium on New Horizons on Nonlinear Fibre Optics; 06/2014