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Wang, Yingying; Dai, Shixun; Han, Xin; Zhang, Peiqing; Liu, Yongxing; Wang, Xunsi; Sun, Songlin

doi:10.1016/j.optcom.2017.10.056

Cited by 19 publications

(11 citation statements)

References 33 publications

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“…Moreover, the impact of a high linear absorption edge after 17 µm of As 2 Se 3 material may also clamp further SC spectral broadening at the PCF output. Wang et al [34] recently reported MIR region SC generation using a 12-cm-long As 2 Se 3 step-index fiber with a measured average transmission loss of 4 dB/m between 2.5 µm and 12 µm with three strong absorption peaks of O-H, As-O and Se-O located around at 2.7 µm, 8.2 µm and 10.5 µm, respectively. To see the impact of long wavelength absorption loss on SC bandwidth at the PCF output, numerical simulations are performed for the proposed structures by arbitrarily increasing the linear propagation loss from 0.65 dB/cm to 2 dB/cm, giving simulated result in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Hudson et al [32] reported a broadband MIR SC spectrum spanning from 1.8 to 9.5 µm using a As 2 Se 3 /As 2 S 3 tapered fiber by launching 230-fs pulses with a pulse peak power of 4.2 kW, and Saini et al [33] numerically demonstrated MIR SC generation covering a wavelength range 2-15 µm in a 5-mm long triangular core graded index As 2 Se 3 PCF when pumped at 4.1 µm with a largest peak power of 3.5 kW. Wang et al [34] recently reported MIR region SC generation covering a wavelength from 2 to 12.7 µm using a 12-cm long step-index fiber using As 2 Se 3 as the core and As 2 Se 2 S as the outer cladding using a pump at 6.5 µm with a pulse of 150-fs duration and a peak power of 93 MW. As alternative to index guiding microstructured fibers, recently developed hybrid/hollow-core bandgap guiding PCFs have also attracted considerable attention among the researchers owing to their inherent ability to integrate with different fluids, solids, and gases.…”

Section: Introductionmentioning

confidence: 99%

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Mid-infrared supercontinuum generation using As2Se3 photonic crystal fiber and the impact of higher-order dispersion parameters on its supercontinuum bandwidth

Karim

Ahmad

Ghosh

et al. 2018

Optical Fiber Technology

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Citation: Karim, M. R., Ahmad, H., Ghosh, S. ORCID: 0000-0002-1992-2289 and Rahman, B. M. ORCID: 0000-0001-6384-0961 (2018). Mid-infrared supercontinuum generation using As2Se3 photonic crystal fiber and the impact of higher-order dispersion parameters on its supercontinuum bandwidth. This is the accepted version of the paper.This version of the publication may differ from the final published version.Permanent repository link: http://openaccess.city.ac.uk/20499/ Link to published version: http://dx. AbstractA dispersion engineered As 2 Se 3 chalcogenide hexagonal photonic crystal fiber which can produce mid-infrared supercontinuum (SC) spectral evolution spanning from 2 µm to beyond 15 µm with a low peak power of 3 kW is numerically designed and demonstrated. Numerical analysis is carried out to investigate the impact of higher-order dispersion (HOD) parameters on the output SC bandwidth. Numerical analysis shows that the SC spectral broadening at the output of the proposed design depends on the convergence of the Taylor approximation with increasing fitting parameters, which implies a sufficient number of HOD parameters must be included during numerical simulations. Four designs with different structural parameters are optimized for pumping each operating at a different pump wavelength to test the convergence of output SC by the successive addition of HOD parameters. To realize spurious free SC spectral evolution by the proposed designs, HOD terms up to the sixteenth-order are included during all SC simulations. The proposed design can be used in molecular finger print spectroscopy, bio-medical imaging as well as various mid-infrared region applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mid-infrared supercontinuum generation using As2Se3 photonic crystal fiber and the impact of higher-order dispersion parameters on its supercontinuum bandwidth

Karim

Ahmad

Ghosh

et al. 2018

Optical Fiber Technology

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“…Silica fiber 1.46 @1.55 mm (Agrawal, 2000) 2.36 3 10 À20 @1.55 mm (Kim et al, 1994) 0.24-2 (Li, 2012) 0.0002 @1.55 mm (Miya et al, 1979) As 2 S 3 fiber 2.4 @1.55mm (Florea et al, 2009;Rodney et al, 1958) 3 3 10 À18 @2 mm (Lamont et al, 2008) 0.7-6 (Harrington, 2004;Kanamori et al, 1984) 0.2 @1.55 mm (Miyashita and Terunuma, 1982) As 2 Se 3 fiber 2.83 @1.55 mm (Boudebs et al, 2004) 1.1 3 10 À17 @2 mm (Fu et al, 2005) 1-10 ( Dai et al, 2018;Wang et al, 2018) 0.85 @1.55 mm (Baker and Rochette, 2012;Slusher et al, 2004) Te-based fiber (Tao et al, 2015) 3.2 @2 mm~10 -17 2-12 3 @10 mm GeAsSe PCF 2.6 @2 mm (Dantanarayana et al, 2014) 5.3 3 10 À17 @2 mm (Xing et al, 2016) -0.5 @2 mm (Xing et al, 2016)…”

Section: Device and Materials Refractive Indexmentioning

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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“…To date, a few of the following longest wavelength theoretical and experimental SC spectral evolution were demonstrated through optical planar waveguide and fiber based designs [24][25][26][27][28][29][30][31][32] . Yu et al 24 reported SC generation spanning up to the MIR covering the wavelength range 2 to 10 µm by an all-ChG rib waveguide using GeAsSe and GeAsS glasses for its upper and lower claddings, respectively, with 330-fs pulses pumped at 4.184 µm with an input peak power of 4.5 kW.…”

Section: Fig 1: Channel Waveguide Geometrymentioning

confidence: 99%

“…Wang et al . 32 recently reported MIR region SC generation covering the wavelength from 2 to 12.7 µm using 12-cm long step-index fiber made using As 2 Se 3 as a core and As 2 Se 2 S as an outer cladding by employing pump at 6.5 µm having pulses of 150-fs duration with a peak power of 93 MW.…”

Section: Fig 1: Channel Waveguide Geometrymentioning

confidence: 99%

Design of dispersion-engineered As2Se3 channel waveguide for mid-infrared region supercontinuum generation

Karim

Ahmad

Ghosh

et al. 2018

Journal of Applied Physics

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In recent years, low cost and scalable integrated optics compatible planar waveguides have emerged for an ultrabroadband supercontinuum generation between ultraviolet and mid-infrared region applications. A 20mm-long integrated photonics compatible highly nonlinear As 2 Se 3 channel waveguide, which exhibited wider as well as lower magnitude and nearly flat anomalous dispersion region, designed and modeled by employing GeAsSe glass for its upper and lower claddings. Using pump source at 6 µm with a pulse duration of 170-fs, an ultrabroadband long wavelength region supercontinuum broadening covering the wavelength from 3.5 µm to up to 15 µm could be predicted with the largest input peak power of 10 kW. Further increasing power up to 20 kW does not enhance the supercontinuum expansion noticeably beyond 15 µm. This could be the longest supercontinuum generation by an on-chip integrated photonics compatible planar waveguide which can be used for a variety of mid-infrared region applications.

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Broadband mid-infrared supercontinuum generation in novel As2Se3-As

Cited by 19 publications

References 33 publications

Mid-infrared supercontinuum generation using As2Se3 photonic crystal fiber and the impact of higher-order dispersion parameters on its supercontinuum bandwidth

Mid-infrared supercontinuum generation using As2Se3 photonic crystal fiber and the impact of higher-order dispersion parameters on its supercontinuum bandwidth

Chalcogenide Taper and Its Nonlinear Effects and Sensing Applications

Design of dispersion-engineered As2Se3 channel waveguide for mid-infrared region supercontinuum generation

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