Broadband supercontinuum generation in all-normal dispersion chalcogenide microwires

Al-Kadry, Alaa; Li, Lizhu; North, Thibault; Rochette, Martin; El-Amraoui, Mohammed; Messaddeq, Younès

doi:10.1109/pn.2015.7292521

Cited by 12 publications

(14 citation statements)

References 4 publications

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“…The core diameter is optimized to 1.6 mm to locate the pump wavelength in the anomalous dispersion regime with b 2 = À130 ps 2 ∕km and g = 32.2 W À1 m À1 , which realizes the 3.3-mm-broad bandwidth using low pump pulse energy of 500 pJ. Al-kadry (Al-Kadry et al, 2015b) also introduced a supercontinuum generation in the normal dispersion regime. A 3-mm-long As 2 S 3 -PMMA microwire was tapered down to a diameter of 0.58 mm for supercontinuum generation from 960 to 2,500 nm using low pulse energy of 150 pJ.…”

Section: Supercontinuum Generationmentioning

confidence: 99%

Chalcogenide Taper and Its Nonlinear Effects and Sensing Applications

Gao

Bao

2020

iScience

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The nonlinear coefficient of chalcogenide glass is 200-1000 times larger than that of silica glass, and it is transparent in the 1-15 mm wavelength windows, which makes the nonlinear effects happen at much low power with a short length in near-and mid-infrared wavelength window. With tapered chalcogenide fibers, the power density in the core and the waveguide nonlinearity can be enhanced to make nonlinear signal processing unit at a compact size. The threshold of Raman scattering and supercontinuum generation is reduced due to the enhanced Kerr effect and enhanced optical power intensity. Phase-matching condition required in four-wave mixing (FWM) can be realized by tailoring fiber structures to engineer the chromatic dispersion, which enables new wavelengths creation over a large range at mW power and sub-meter length. The guided acoustic waves and longitudinal acoustic waves can be generated and detected in mW power with chalcogenide tapers. The high power density in the microwires and the high photosensitivity of chalcogenide glass in the 1550 nm band enable the inscription of FBGs in the fiber directly. The chalcogenide microwires are fragile and the core diameter cannot be tapered down to sub-microns, which can be mitigated by polymer coating that can provide mechanical strength. Polymers not only provide high mechanical strength as the coating and cladding materials but also bring over 10 times larger thermal expansion than chalcogenide cores, which enhances the sensor prospect of the chalcogenide fibers for temperature, strain, and acoustic sensing. This work reviews the present and emerging trends in investigation of chalcogenide tapers, mainly focusing on the fabrication procedure of chalcogenide microwires, the nonlinear effects, and sensing applications.

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Section: Supercontinuum Generationmentioning

confidence: 99%

Chalcogenide Taper and Its Nonlinear Effects and Sensing Applications

Gao

Bao

2020

iScience

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“…In recent years, SC generations in all normal dispersive fibers without ZDW have been demonstrated. Highly coherent supercontinua with flat spectra are generated in such fibers [139][140][141][142][143]. However, without the tremendous spectral broadening of soliton fission, much higher peak power is required to generate SC with bandwidth comparable to that generated with the anomalous dispersion pump scheme [139][140][141][142][143].…”

Section: Dynamics Of Sc Generationmentioning

confidence: 99%

Modeling Frequency Comb Sources

Yuan

Kang

et al. 2016

Nanophotonics

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Frequency comb sources have revolutionized metrology and spectroscopy and found applications in many fields. Stable, low-cost, high-quality frequency comb sources are important to these applications. Modeling of the frequency comb sources will help the understanding of the operation mechanism and optimization of the design of such sources. In this paper, we review the theoretical models used and recent progress of the modeling of frequency comb sources.

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“…To obtain enhanced spectral broadening, the GVD needs to be adjusted in such a way that the optical waveguide can be pumped in the anomalous dispersion regime close to the zero-dispersion wavelength (ZDW) [4]. The broadening mechanism in the case of short pump pulses mainly results from soliton dynamics and the breakup of the injected pulses through soliton fission is very sensitive to shot-to-shot input pump pulse to pulse intensity fluctuations [5]. These intensity fluctuations limit the signal-to-noise ratio in various applications including optical coherence tomography and frequency metrology [6].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, chalcogenide (ChG) fibers have shown promising candidate for coherent broadband near-infrared to MIR SC generation due to their low phonon energy, higher Kerr nonlinearity and wide transparency [9]. Al-Kadry et al experimentally reported the broadband coherent MIR SC generation in allnormal dispersion using 3-mm-long As 2 S 3 ChG microwire spanning over an octave from 960 nm to 2500 nm pumping at a wavelength of 1.55 µm with a pulse energy of 150 pJ [5]. Liu et al used 2-cm-long four-hole ChG microstructured fiber made using AsSe 2 glass material to generate broadband coherent MIR SC in all-normal GVD region extending up to 3.3 µm pumped with 200-fs pulse duration at a wavelength of 2.7 µm with a peak power of 5.2 kW [9].…”

Section: Introductionmentioning

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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Broadband supercontinuum generation in all-normal dispersion chalcogenide microwires

Cited by 12 publications

References 4 publications

Chalcogenide Taper and Its Nonlinear Effects and Sensing Applications

Chalcogenide Taper and Its Nonlinear Effects and Sensing Applications

Modeling Frequency Comb Sources

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

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