Systematic z-scan measurements of the third order nonlinearity of chalcogenide glasses

Wang, Ting; Gai, Xin; Wei, Wen-Hou; Wang, Rongping; Yang, Zhiyong; Shen, Xiang; Madden, Steve; Luther‐Davies, Barry

doi:10.1364/ome.4.001011

Cited by 171 publications

(114 citation statements)

References 32 publications

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“…We included a wavelength independent propagation loss of 3.2 dB/cm at this wavelength. The n 2 and α 2 , which have been measured at a wavelength of 1.55 µm by Wang et al [13] using z-scan technique, are assumed to be 7.33×10 −18 m 2 /W and 7.88×10 −14 m/W, respectively. Using FEM solver, we calculate A eff = 3.43 µm 2 which yields γ = 8.66 /W/m at a wavelength of 1.55 µm.…”

Section: Numerical Resultsmentioning

confidence: 99%

All-Normal Dispersion Chalcogenide PCF for Ultraflat Mid-Infrared Supercontinuum Generation

Karim

Ahmad

Rahman

2017

IEEE Photon. Technol. Lett.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract-We numerically study the dispersion-engineered chalcogenide photonic crystal fiber (PCF) which allows us to generate ultraflat broadband supercontinuum (SC) spectra in allnormal dispersion regime. A 1-cm-long chalcogenide hexagonal PCF made using Ge11.5As24Se64.5 glass pumped at 1.55 µm produced a SC bandwidth 700 nm at a peak power of 1 kW. By shifting pump at 2 µm, SC spectra can be extended with a bandwidth of 1900 nm at the same peak power level. In both cases, nonuniform spectral power distribution observes over the entire output bandwidth owing to the lower dispersion slop on the long wavelength side of the dispersion curve. To spanning SC further in the mid-infrared as well as to reduce the spectral asymmetry, we optimize another design for pumping at 3.1 µm in such a way that the pump source can be employed vicinity to the peak of the dispersion curve. Employing the largest pump peak power up to 5 kW, SC can be extended up to 6 µm (1.5 octaves) and the power distribution among the spectral components over the entire SC bandwidth can be improved significantly by this design. To enhance the spectral flatness, we optimize a second PCF geometry by reducing its pitch length and it is possible to obtain ultraflat coherent SC spanning from 2 µm to 5.5 µm (>1 octave) by this structure maintaining nearly symmetric power distribution between both side of its spectral components. Permanent repository link

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Section: Numerical Resultsmentioning

confidence: 99%

All-Normal Dispersion Chalcogenide PCF for Ultraflat Mid-Infrared Supercontinuum Generation

Karim

Ahmad

Rahman

2017

IEEE Photon. Technol. Lett.

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“…В част-ности, этот класс материалов является перспективным для оптической передачи информации [5,6], измерений в инфракрасном диапазоне длин волн [7,8], создания оптических запоминающих устройств [9]. Исследова-ние нелинейных свойств и их связь с микроскопиче-ской структурой стекла представляет собой отдельную задачу, для решения которой применяют различные методы [2], например z -сканирование [10] или метод нелинейного фазового контраста [11].…”

Section: Introductionunclassified

Структурная модификация фемтосекундным лазерным излучением пленок халькогенидного стекла As-=SUB=-50-=/SUB=-S-=SUB=-50-=/SUB=-, полученных методом плазмохимического осаждения из газовой фазы-=SUP=-*-=/SUP=-

Ромашкин¹,

Мурзанев²,

Киселев³

et al. 2018

Журнал Технической Физики

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Оптика и спектроскопия, 2018, том 124, выпПредставлены результаты исследования модификации тонкой пленки халькогенидного стекла состава As 50 S 50 фемтосекундным лазерным излучением на длине волны 800 nm. Анализ характера модификации проводился методами интерферометрии, атомной силовой микроскопии и рамановской спектроскопии. Установлена связь изменения величины показателя преломления при модификации образца со структурными изменениями сетки стекла.

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“…11 The addition of Ge into glass network can promote the glass transition due to the well-known fact that the substitution of three-coordinated As and two-coordinated Te by four-coordinated Ge can enhance the glass network connectivity. [12][13][14] On the other hand, there is an argument that chemical coordination of Te could vary from 2 in Te-rich and chemically stoichiometric glasses to 3 in Te-poor glasses, [15][16][17] but solid evidence is still scare. Therefore in the present paper, we prepared 7 pieces of Ge 10 As x Te 90-x glasses and investigated the evolution of the structure with changing chemical compositions using high resolution x-ray photoelectron spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 99%

X-ray photoelectron spectra of Ge-As-Te glasses

et al. 2018

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ARTICLES YOU MAY BE INTERESTED INComparison of measured pinch parameters versus pressure for SABALAN1 plasma focus facility against computed values using Lee model code AIP Advances 8, 075209 (2018) Ternary Ge 10 As x Te 90-x glasses with a mean coordination number (MCN) from 2.3 to 2.8 were prepared, and their physical and structural properties were characterized. It was found that, the density of the glass decreases but glass transition temperature T g increases, and the near infrared transmission edge shifts to shorter wavelength with increasing As content. The Ge, As, and Te 3d spectra were decomposed into different doublets that correspond to different structural units and the results showed that, the numbers of Te-Te-Te trimmers and Te-Te-As(Ge) structural units decrease and finally disappear, while the perfect AsTe 3/2 pyramidal and GeTe 4/2 tetrahedral structure in Te-rich samples gradually transferred to defect structures including As-As and Ge-Ge homopolar bonds with increasing As concentration. No threshold behaviour can be found in the structural evolution of Ge 10

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Systematic z-scan measurements of the third order nonlinearity of chalcogenide glasses

Cited by 171 publications

References 32 publications

All-Normal Dispersion Chalcogenide PCF for Ultraflat Mid-Infrared Supercontinuum Generation

All-Normal Dispersion Chalcogenide PCF for Ultraflat Mid-Infrared Supercontinuum Generation

X-ray photoelectron spectra of Ge-As-Te glasses

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