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Cambridge CDT student James Lee's project generates a supercontinuum

CDT student James Lee is currently doing his first MRes project supervised by Professor Clemens Kaminski and Dr Weiwei Cai at Cambridge about flame tomography.
Cambridge CDT student James Lee's project generates a supercontinuum

Fibre while generating a supercontinuum

 

CDT student James Lee who is currently doing his first MRes project supervised by Professor Klemens Kaminski and Dr Weiwei Cai at Cambridge. It is about flame tomography - constructing a 3D image of a flame by taking images at different angles. This is similar to the process used to take a CT scan. James hopes to be able to get spectral information from the flame, which will allow him to see which species are present in the flame and where they are.

James and his research group plan on using a Fourier transform interferometer to analyse infrared light that has passed through the flame. The light sent through the flame will be a broad spectrum of coherent light, produced by a supercontinuum laser. He is producing a supercontinuum by sending short, high-intensity infrared laser pulses through a photonic crystal fibre.

Although James and his team haven't yet been able to produce the wavelengths they want, they have been able to generate a supercontinuum that stretches into the visible part of the spectrum, which means means that they have been able to take some interesting images.

The photo is of the fibre while generating a supercontinuum - the changing shades of blue and purple (and eventually faint orange) in the fibre is a result of changing the frequency of the infrared laser.