This 3-year PhD project is part of a grant funded by the New Zealand MBIE to develop a nonlinear spectroscopy and imaging system to sense water-borne contaminants (e.g. microplastics) and pathogens (e.g. bacteria) in flowing water in real time. The goal is to develop spatio-chemical fingerprints using hyperspectral, femtosecond coherent anti-Stokes Raman scattering. This approach to in situ sensing is challenging and highly novel, and shows great promise for having a positive impact upon our water quality. The research will involve ultrashort pulsed lasers, instrument design, construction and testing, and application of the prototype instrument in the lab and in the field. The core areas of physics that the successful candidate will explore include, • Ultrafast nonlinear optics; • Parametric frequency conversion; • Supercontinuum generation (including spatiotemporal beam shaping); • Real-time holography; • Coherent anti-Stokes Raman scattering spectroscopy; and • Identification and characterisation of components within complex solutions (large data management and analysis). The project is part of the wider portfolio of photonics research that is performed in the Photon Factory at the University of Auckland, New Zealand. The Photon Factory is a multi-user, multi-disciplinary laser facility with 30+ physics, engineering, chemistry and biology students and staff. Research spans the fundamental, applied and entrepreneurial. This fully funded PhD fellowship will be supervised by Professor Cather Simpson, founder of the Photon Factory. The Photon Factory embraces diversity and is committed to creating an inclusive research environment in which all students and staff can succeed. Interested candidates should contact Prof. Simpson at [email protected].