Sam Rogers
Technical Specialist in Laser Systems
Research
Overview
My research in WACL centres around the utilisation of lasers for the measurement of key atmospheric species (specifically NO x , SO 2 and O 3 ). Laser based techniques such as Laser Induced Fluorescence (LIF) and Cavity Enhanced Absorption Spectroscopy (CEAS) are capable of measuring several of these important atmospheric components with unrivalled sensitivity and specificity and field measurements which take advantage of these techniques are therefore highly desirable. My work strives to construct, characterise and deploy robust laser-based instrumentation capable of detecting the target species with high precision, sensitivity and temporal resolution, even in challenging environments. This work serves to further our understanding of the chemistry of the troposphere and anthropogenic impacts on that chemistry.
Projects
My current project involves the construction of state-of-the-art LIF instruments harnessing deep UV radiation for the detection of NO x and SO 2 down to single PPT concentrations. This project has included the construction of custom-built fibre-amplified laser systems combined with non-linear optics to produce the required laser power and wavelength. These instruments will ultimately be deployed on the FAAM UK research aircraft. Before coming to WACL my research was focussed on spectroscopic probes of low pressure
plasma. In particular the detection of plasma-generated
Publications
Selected publications
● Measurements of N 2 + ions in an inductively coupled plasma using saturated cavity ringdown spectroscopy. S D A Rogers, C Kniebe-Evans, R Peverall, G Hancock, B J Rhodes and G A D Ritchie, Plasma Sources Science and Technology, 33, 125002,
2024, DOI: 10.1088/1361-6595/ad934f
● Insights into spatial inhomogeneity in an oxygen plasma from cavity ringdown spectroscopy. S D A Rogers, A Bond, R Peverall, G Hancock and G A D Rogers, Plasma Sources Science and Technology, 33, 015005, 2024, DOI: 10.1088/1361- 6595/ad1a79
● Cavity ringdown studies of the E–H transition in an inductively coupled oxygen plasma: comparison of spectroscopic measurements and modelling. S D A Rogers, A Bond, B J Rhodes, R Peverall, G Hancock and G A D Ritchie, Plasma Sources Science and Technology, 31, 115006, 2022, DOI: 10.1088/1361-6595/ac9d62
● Quantitative measurements of singlet molecular oxygen in a low pressure ICP. S D A Rogers, A Bond, R Peverall, G Hancock, C M Western and G A D Ritchie, Plasma Sources Science and Technology, 30, 09LT02, 2021, DOI: 10.1088/1361-6595/ac2044
● Quantitative measurements of oxygen atom and negative ion densities in a low pressure oxygen plasma by cavity ringdown spectroscopy. R Peverall, S D A Rogers and G A D Ritchie, 29, 045004, 2020, DOI: 10.1088/1361-6595/ab7840
