Abstract
We demonstrate the supercontinuum (SC) generation in a suspended-core As(2)S(3) chalcogenide microstructured optical fiber (MOF). The variation of SC is investigated by changing the fiber length, pump peak power and pump wavelength. In the case of long fibers (20 and 40 cm), the SC ranges are discontinuous and stop at the wavelengths shorter than 3500 nm, due to the absorption of fiber. In the case of short fibers (1.3 and 2.4 cm), the SC ranges are continuous and can extend to the wavelengths longer than 4 μm. The SC broadening is observed when the pump peak power increases from 0.24 to 1.32 kW at 2500 nm. The SC range increases with the pump wavelength changing from 2200 to 2600 nm, corresponding to the dispersion of As(2)S(3) MOF from the normal to anomalous region. The SC generation is simulated by the generalized nonlinear Schrödinger equation. The simulation includes the SC difference between 1.3 and 2.4 cm long fiber by 2500 nm pumping, the variation of SC with pump peak power in 2.4 cm long fiber, and the variation of SC with pump wavelength in 1.3 cm long fiber. The simulation agrees well with the experiment.
Highlights
Supercontinuum (SC) generation in optical fibers has attracted extensive attention owing to its applications in fiber sensing [1], frequency metrology [2], optical coherence tomography [3, 4] and spectroscopy [5]
Microstructured optical fibers (MOFs) or holey fibers have been successfully used for SC generation since they were first proposed by Knight et al in early 90’s [9]
We present the SC generation in a suspended-core As2S3 chalcogenide MOF
Summary
Supercontinuum (SC) generation in optical fibers has attracted extensive attention owing to its applications in fiber sensing [1], frequency metrology [2], optical coherence tomography [3, 4] and spectroscopy [5]. Alternative materials to fused silica are necessary for generating the SCs at longer wavelengths in the MIR region. Chalcogenide glass has great advantages due to their wider transmission window and higher nonlinearity in MIR region [23,24,25,26,27], as compared to the other materials mentioned above. It was possible to generate spectral range of SC longer than 4 μm by carefully selecting the waveguide parameters of the MOF as well as the peak power and duration of the pump pulse, according to the results by Hu et al [39, 40]. Marandi et al experimentally demonstrated the SC in the MIR region from 2.2 to 5 μm in a tapered As2S3 fiber [37], which was pumped by the pulses shorter than 100 fs centered around 3.1 μm from the subharmonic of a mode-locked Er-doped fiber laser. The simulation demonstrated that the SC evolution in theory was similar to that in experiment
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