Journal article
Mid-infrared supercontinuum covering the 1.4–13.3 μm molecular fingerprint region using ultra-high NA chalcogenide step-index fibre
Department of Photonics Engineering, Technical University of Denmark1
Fiber Sensors & Supercontinuum, Department of Photonics Engineering, Technical University of Denmark2
Ultrafast Nonlinear Optics group, Department of Photonics Engineering, Technical University of Denmark3
Aarhus University4
University of Nottingham5
The mid-infrared spectral region is of great technical and scientific interest because most molecules display fundamental vibrational absorptions in this region, leaving distinctive spectral fingerprints. To date, the limitations of mid-infrared light sources such as thermal emitters, low-power laser diodes, quantum cascade lasers and synchrotron radiation have precluded mid-infrared applications where the spatial coherence, broad bandwidth, high brightness and portability of a supercontinuum laser are all required.
Here, we demonstrate experimentally that launching intense ultra-short pulses with a central wavelength of either 4.5 μm or 6.3 μm into short pieces of ultra-high numerical-aperture step-index chalcogenide glass optical fibre generates a mid-infrared supercontinuum spanning 1.5 μm to 11.7 μm and 1.4 μm to 13.3 μm, respectively.
This is the first experimental demonstration to truly reveal the potential of fibres to emit across the mid-infrared molecular ‘fingerprint region’, which is of key importance for applications such as early cancer diagnostics3, gas sensing and food quality control.
Language: | English |
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Publisher: | Nature Publishing Group |
Year: | 2014 |
Pages: | 830-834 |
ISSN: | 17494893 and 17494885 |
Types: | Journal article |
DOI: | 10.1038/nphoton.2014.213 |
ORCIDs: | 0000-0001-7433-2962 , 0000-0002-7582-6451 , Petersen, Christian Rosenberg , Zhou, Binbin and Bang, Ole |