Broadband mid-infrared supercontinuum generation in dispersion-engineered As2S3-silica nanospike waveguides pumped by 2.8 μm femtosecond laser
Wang P, Huang J, Xie S, Troles J, Russell PSJ (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 9
Pages Range: 630-636
Journal Issue: 4
DOI: 10.1364/PRJ.415339
Abstract
Broadband mid-infrared (IR) supercontinuum laser sources are essential for spectroscopy in the molecular fingerprint region. Here, we report generation of octave-spanning and coherent mid-IR supercontinua in As2S3-silica nanospike hybrid waveguides pumped by a custom-built 2.8 μm femtosecond fiber laser. The waveguides are formed by pressure-assisted melt-filling of molten As2S3 into silica capillaries, allowing the dispersion and nonlinearity to be precisely tailored. Continuous coherent spectra spanning from 1.1 μm to 4.8 μm (30 dB level) are observed when the waveguide is designed so that 2.8 μm lies in the anomalous dispersion regime. Moreover, linearly tapered millimeter-scale As2S3-silica waveguides are fabricated and investigated for the first time, to the best of our knowledge, showing much broader supercontinua than uniform waveguides, with improved spectral coherence. The waveguides are demonstrated to be long-term stable and water-resistant due to the shielding of the As2S3 by the fused silica sheath. They offer an alternative route to generating broadband mid-IR supercontinua, with applications in frequency metrology and molecular spectroscopy, especially in humid and aqueous environments.
Authors with CRIS profile
Philip St. John Russell
Lehrstuhl für Experimentalphysik (Alfried Krupp von Bohlen und Halbach-Professur)
Involved external institutions
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
Université de Rennes 1 / University of Rennes 1
France (FR)
Germany (DE)
Université de Rennes 1 / University of Rennes 1
France (FR)
How to cite
APA:
Wang, P., Huang, J., Xie, S., Troles, J., & Russell, P.S.J. (2021). Broadband mid-infrared supercontinuum generation in dispersion-engineered As2S3-silica nanospike waveguides pumped by 2.8 μm femtosecond laser. Photonics Research, 9(4), 630-636. https://doi.org/10.1364/PRJ.415339
MLA:
Wang, Pan, et al. "Broadband mid-infrared supercontinuum generation in dispersion-engineered As2S3-silica nanospike waveguides pumped by 2.8 μm femtosecond laser." Photonics Research 9.4 (2021): 630-636.
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