Octave-Spanning Supercontinuum Generated in As2S3-Silica Waveguides Pumped by Tm-doped All-fibre MOPA

Vasilii Voropaev, Shangran Xie, Aleksandr Donodin, Dmitrii Vlasov, Daniil Batov, Mikhail Tarabrin, Johann Troles, Vladimir Lazarev

Research output: Chapter in Book/Published conference outputConference publication

Abstract

Fiber-based supercontinuum sources in the mid-IR wavelength range are highly desirable for many applications [1] - [3]. Here we report the generation of octave-spanning supercontinua in As 2 S 3 -silica hybrid waveguides pumped by a thulium-doped all-fiber master-oscillator-power-amplifier (MOPA). The narrow As 2 S 3 core of the step-index waveguide has an extremely high nonlinearity, and by balancing its anomalous geometrical dispersion against the normal dispersion of the glass, the zero dispersion wavelength of the guided mode can be shifted towards the pump wavelength by suitable design. The nanospikes at both ends of the hybrid waveguide (see Fig. 1a ) are used to boost the launch efficiency into the fundamental core mode [3] , [4]. A thulium-doped all-fiber MOPA centred at 1.9m [5] , [6] was used as pump source. It emits pulses with a duration of 78 fs and a maximum peak power of 200 kW at a repetition rate of 23.8 MHz. Dual nanospike waveguides with core diameters d = 1.7m and 1.2m were tested in the experiment. The length of both waveguides was 3 mm. Fig. 1b plots the calculated dispersion parameter of the two waveguides. For d = 1.7m the pump lies within ~ 50 nm of a zero dispersion wavelength, in which case for a launched energy of ~32 pJ the measured spectrum at the output extends from 1.1m to 2.5m at the -10 dB level. The total output average power was measured as ~ 1.2 mW. When d = 1.2m, the pump wavelength lies in between two zero dispersion wavelengths, and for 23 pJ launched energy the spectrum extends from 1.7m to 2.3m, while a weak dispersive wave appears at 963 nm. In both cases the third harmonic components are visible at 630 nm (inset of Fig. 1c ), which fall within the bandgap of the As 2 S 3 material, limiting further increase of the pump energy. Numerically simulated spectra (black-dotted curves) calculated for the experimental pulse energy agree well with the measurements.

Original languageEnglish
Title of host publication2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
PublisherIEEE
ISBN (Electronic)9781665418768
DOIs
Publication statusPublished - 30 Sept 2021
Event2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021 - Munich, Germany
Duration: 21 Jun 202125 Jun 2021

Publication series

Name2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Conference

Conference2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
Country/TerritoryGermany
CityMunich
Period21/06/2125/06/21

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