Quantum cascade laser light propagation through hollow silica waveguides

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dc.contributor.author Francis, D.
dc.contributor.author Hodgkinson, Jane
dc.contributor.author Livingstone, B.
dc.contributor.author Tatam, Ralph P.
dc.date.accessioned 2016-05-04T10:49:30Z
dc.date.available 2016-05-04T10:49:30Z
dc.date.issued 2015-04-03
dc.identifier.citation Francis, D (et al.) 2015, Quantum cascade laser light propagation through hollow silica waveguides, Applied Physics B, Volume 119, Issue 1, pp 75-86 en_UK
dc.identifier.issn 0946-2171
dc.identifier.uri http://dx.doi.org/10.1007/s00340-015-6065-5
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/9853
dc.description.abstract In this paper, the transmission characteristics of hollow silica waveguides with bore diameters of 300 and 1000 μm are investigated using a 7.8-μm quantum cascade laser system. We show that the bore diameter, coiling and launch conditions have an impact on the number of supported modes in the waveguide. Experimental verification of theoretical predictions is achieved using a thermal imaging camera to monitor output intensity distributions from waveguides under a range of conditions. The thermal imaging camera allowed for more detailed images than could be obtained with a conventionally used beam profiler. The results show that quasi-single-mode transmission is achievable under certain conditions although guided single-mode transmission in coiled waveguides requires a smaller bore diameter-to-wavelength ratio than is currently available. Assessment of mode population is made by investigating the spatial frequency content of images recorded at the waveguide output using Fourier transform techniques. en_UK
dc.language.iso en en_UK
dc.publisher Springer Verlag en_UK
dc.title Quantum cascade laser light propagation through hollow silica waveguides en_UK
dc.type Article en_UK


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