15–14  μm midinfrared supercontinuum generation in a low-loss Te-based chalcogenide step-index fiber

Zhao, Zheming; Wang, Xunsi; Dai, Shixun; Pan, Zhiyong; Liu, Shuo; Sun, Li; Zhang, Peiqing; Liu, Zijun; Nie, Qiuhua; Shen, Xiang; Wang, Rongping

doi:10.1364/ol.41.005222

Cited by 81 publications

(23 citation statements)

References 26 publications

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“…However, in the normal dispersion region far from ZDW (9.4 μm), a short pump wavelength can produce a wide SC spectrum. The same phenomenon has been observed in the study of SC spectroscopy of Ge–As–Se–Te fibers, but the reason has not been clear yet . However, dispersion, absorption of the impurities, and MIR nonlinear absorption are certainly not the influencing factors behind this phenomenon.…”

Section: Resultssupporting

confidence: 66%

“…The same phenomenon has been observed in the study of SC spectroscopy of Ge-As-Se-Te fibers, but the reason has not been clear yet. 36 However, dispersion, absorption of the impurities, and MIR nonlinear absorption are certainly not the influencing factors behind this phenomenon. These factors mainly determine the efficiency and spectral shape of SC generated by ultrashort pulses in large core optical fibers.…”

Section: Resultsmentioning

confidence: 99%

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1.8–13 μm supercontinuum generation by pumping at normal dispersion regime of As–Se–Te glass fiber

Yang

et al. 2019

J Am Ceram Soc

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Mid‐infrared (MIR) band supercontinuum (SC) light source has highly important application prospects in aerospace, biomedicine, MIR sensing, and pollutant monitoring. As–Se–Te glass has high nonlinear refractive index, wide MIR transmission range and weak crystallization ability. As40Se40Te20 glass fiber is suitable for producing wide MIR–SC spectrum. In this study, purified As40Se40Te20 glass was prepared and unclad and step‐index fibers were drawn. An unclad As40Se40Te20 glass fiber with minimum loss of 1.7 dB/m at 8.8 μm was obtained. By pumping the unclad fiber in the normal dispersion region at 5 μm, we recorded the broadest SC generation spectrum, which covered 1.8–13 μm with a 30 dB spectral flatness, from a fiber with 15 cm length. Besides, As40Se40Te20/As40Se42Te18 step‐index fiber with minimum loss of 5.6 dB/m at 5 μm was drawn from isolation extruded preform. The step‐index fiber was pumped in the normal dispersion region at 5 μm, and the SC spectrum, covering 2.1–11.2 μm with a 40 dB spectral flatness, was recorded from a fiber with 15 cm length. The SC spectrum, which was achieved by pumping the As40Se40Te20 fiber, covered almost all the transparent range of material.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

1.8–13 μm supercontinuum generation by pumping at normal dispersion regime of As–Se–Te glass fiber

Yang

et al. 2019

J Am Ceram Soc

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“…High purity elements were employed as starting materials in order to obtain high‐purity glasses. Ge and Se were further purified by the distillation method employing Mg as oxygen getter to remove oxide impurities . A 9 mm‐diameter 56.1(GeSe 2 )‐25.5(Ga 2 Se 3 )‐18.4(CsI) glass rod and a 26 mm‐diameter 55(GeSe 2 )‐25(Ga 2 Se 3 )‐20(CsI) glass rod were prepared as the core/cladding materials.…”

Section: Methodsmentioning

confidence: 99%

“…Ge and Se were further purified by the distillation method employing Mg as oxygen getter to remove oxide impurities. 24 A 9 mm-diameter 56.1(GeSe 2 )-25.5(Ga 2 Se 3 )-18.4(CsI) glass rod and a 26 mm-diameter 55(GeSe 2 )-25(Ga 2 Se 3 )-20(CsI) glass rod were prepared as the core/cladding materials. Since metal halide CsI is sensitive to moisture, ChH glasses can easily absorb water in air at room temperature.…”

Section: Fabrication Of Glass and Fibermentioning

confidence: 99%

A novel chalcohalide fiber with high nonlinearity and low material zero‐dispersion via extrusion

et al. 2019

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High nonlinear fibers with low zero‐dispersion wavelength (ZDW), high laser power tolerance and large band‐gap are urgent for all‐optical‐band supercontinuum (SC) generations. Widely used chalcogenide fibers usually have a large ZDW and low laser power tolerance, and thus are not ideal for such purpose. Here, an ultra‐low material ZDW chalcohalide (ChH) glass fiber with high nonlinearity as well as high laser power tolerance has been fabricated successfully via a novel peeling‐off‐extrusion method. The step‐index fiber has double‐cladding structure, the inner cladding is GeGaSe‐CsI glass and the outer one is GeSbS jacket. The core glass has an ultra‐low material ZDW of 3.5 μm and large absorption edge of 2.0 eV. The nonlinear refractive index is 6.67 × 10−18 m2/W @1.55 μm. Broadband SC generation covering 1.05‐13.0 μm is demonstrated in this novel ChH fiber. Such glass fiber with high nonlinearity, wide transparent range, low ZDW and high laser damage threshold is promising for the applications in the mid‐infrared.

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“…An As-Se commercial fiber has allowed generating SC in the 3-8 µm range using an erbium-doped ZrF 4 -based in-amplifier SC source spanning from 3 to 4.2 μm [5]. SC spectrum spanning 1.5-14 μm has been achieved by pumping a Ge-As-Se-Te fiber at 4.5 μm [6]. An As-S-Se/As-S fiber pumped at 4.8 μm has been used to generate the spectrum in the 1-5 μm range [7].…”

Section: Introductionmentioning

confidence: 99%

On the possibility of mid-IR supercontinuum generation in As-Se-Te/As-S core/clad fibers with all-fiber femtosecond pump source

Anashkina

Shiryaev

Снопатин

et al. 2018

Journal of Non-Crystalline Solids

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Highlights:Mid-IR SC generation in As-Se-Te/As-S fibers pumped at 2 μm is studied numerically. Simulated spectra extending from ~1 µm to more than 8 µm are demonstrated. Low-loss As-Se-Te/As-S step-index fibers are manufactured. AbstractWe propose and optimize theoretically a supercontinuum (SC) laser source in the mid-IR based on using As-SeTe/As-S core/clad step-index fibers and a femtosecond all-fiber laser system at 2 μm. Numerically simulated spectra extending from ~1 µm to more than 8 µm are demonstrated for pump energy of order 100 pJ in a fiber with a core diameter of 2 µm. To the best of our knowledge, the possibility of such long-wavelength spectral conversion of pump pulses at the wavelength of 2 μm in optical fibers is demonstrated for the first time. The theoretical calculations are performed on the base of real low loss step-index As-Se-Te/As-S glass fibers with various coreclad diameter ratios. IntroductionThe mid-infrared (IR) ultra-broadband coherent light sources have important applications in remote sensing, biophotonics, homeland security, and so on. The photonic technologies based on mid-IR fibers providing these properties are very promising [1]. Chalcogenide glasses (ChG) have the broadest transmittance windows and the highest third-order nonlinear refractive indices (n 2 ) among all optical glasses, ~200-1000 times higher than that for silica [1,2]. These characteristics make them ideal candidates for mid-IR nonlinear fiber optics where short sample lengths or ultralow pulse energies are sufficient to elicit nonlinear optical behavior. SC generation in ChG fibers with various compositions, geometrical design, and pumping wavelengths are constantly reported (see [1] and references therein). To date, spectral SCs in the 1.4-13.3 µm and 2-15.1 µm ranges have been demonstrated in AsSe core step-index fibers pumped by optical parametric amplifiers (OPA) at 6.3 µm [3] and at 9.8 µm [4], respectively. An As-Se commercial fiber has allowed generating SC in the 3-8 µm range using an erbium-doped ZrF 4 -based in-amplifier SC source spanning from 3 to 4.2 μm [5]. SC spectrum spanning 1.5-14 μm has been achieved by pumping a Ge-As-Se-Te fiber at 4.5 μm [6]. An As-S-Se/As-S fiber pumped at 4.8 μm has been used to generate the spectrum in the 1-5 μm range [7]. SCs spanning 1.7-7.5 μm and 0.9-9 μm has been obtained with microstructured As-Se fibers pumped by OPA at 4.4 μm [8] and by SC from ZBLAN fiber in the 0.9-4.1 μm range respectively [9]. SC with red boundary beyond 5 μm has been reported for all-solid microstructured As-Se/As-S fiber pumped at 3.4 μm by OPA [10]. However, despite the substantial efforts which have led to startling results over the past several decades, the full potential of ChG fibers has not been achieved yet [2]. For instance, in the majority of the works devoted to mid-IR SC generation, the pump source initially operates in the mid-IR. But it would be great to start from the standard robust fiber laser systems in the near-IR in order to simplify a scheme and make a photonic de...

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15–14 μm midinfrared supercontinuum generation in a low-loss Te-based chalcogenide step-index fiber

Cited by 81 publications

References 26 publications

1.8–13 μm supercontinuum generation by pumping at normal dispersion regime of As–Se–Te glass fiber

1.8–13 μm supercontinuum generation by pumping at normal dispersion regime of As–Se–Te glass fiber

A novel chalcohalide fiber with high nonlinearity and low material zero‐dispersion via extrusion

On the possibility of mid-IR supercontinuum generation in As-Se-Te/As-S core/clad fibers with all-fiber femtosecond pump source

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