Underwater, fibre-based, near background-free, coherent anti-stokes Raman spectroscopy (Conference Presentation)

Alex Risos; Cather Simpson; David E. Williams; Neil G. R. Broderick

doi:10.1117/12.2530972

9 September 2019 Underwater, fibre-based, near background-free, coherent anti-stokes Raman spectroscopy (Conference Presentation)

Alex Risos, Cather Simpson, David E. Williams, Neil G. R. Broderick

Author Affiliations +

Proceedings Volume 11122, Ultrafast Nonlinear Imaging and Spectroscopy VII; 111220O (2019) https://doi.org/10.1117/12.2530972
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Underwater spectroscopy is always a challenge, especially when fighting organic pollutants, which cause fluorescence when looking at plankton in sea water. Using a free space coherent Raman spectroscopy we have obtained key parameters helping us to build our fibre laser spectroscopy system, which we deploy on a boat to measure in-situ, in real time seawater nutrients. We have developed a near background free 2-color coherent anti-Stokes Raman spectroscopy system (CARS), which is based on specially treated photonic crystal fibre supercontinuum in the near femtosecond regime. We will present a full system characterization including the choice of the appropriate wavelengths of the Stokes and pump pulse, optimization of the Stokes supercontinuum in the temporal and spectral domain, as temporal adjustment of our optimized home built fibre laser. Finally, for the first time, we present vessel based spectra of living plankton underwater around New Zealand’s coastal region via a specially designed Raman probe head.

Conference Presentation

Citation Download Citation

Alex Risos, Cather Simpson, David E. Williams, and Neil G. R. Broderick "Underwater, fibre-based, near background-free, coherent anti-stokes Raman spectroscopy (Conference Presentation)", Proc. SPIE 11122, Ultrafast Nonlinear Imaging and Spectroscopy VII, 111220O (9 September 2019); https://doi.org/10.1117/12.2530972

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KEYWORDS

Raman spectroscopy

Fiber lasers

Spectroscopy

Femtosecond phenomena

Fluorescence spectroscopy

Free space

Laser spectroscopy

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