Hyper‐spectral Raman imaging using a diffractive optical element

Abstract

A modification to a conventional imaging Raman microscope to allow the acquisition of quasi-confocal spectra from multiple discrete Raman sampling volumes is reported. Preliminary performance was demonstrated by generating an extended area hyper-spectral chemical map of a number of ground sulfur crystals deposited on an aluminium mirror. Images generated using this multiplexed sampling arrangement were found to contain a number of weak ghost images (cross-talk), corresponding to inadequate separation of the focused laser spots at the sample.