Exploiting spatio‐spectral aberrations for rapid synchrotron infrared imaging

The Infrared Microspectroscopy Beamline at the Australian Synchrotron is equipped with a Fourier transform infrared (FTIR) spectrometer, which is coupled with an infrared (IR) microscope and a choice of two detectors: a single‐point narrow‐band mercury cadmium telluride (MCT) detector and a 64 × 64 multi‐pixel focal plane array (FPA) imaging detector. A scanning‐based point‐by‐point mapping method is commonly used with a tightly focused synchrotron IR beam at the sample plane, using an MCT detector and a matching 36× IR reflecting objective and condenser (NA = 0.5), which is time consuming. In this study, the beam size at the sample plane was increased using a 15× objective and the spatio‐spectral aberrations were investigated. A correlation‐based semi‐synthetic computational optical approach was applied to assess the possibilities of exploiting the aberrations to perform rapid imaging rather than a mapping approach. A correlation‐based semi‐synthetic computational optical approach has been applied to assess the possibilities of exploiting the spatio‐spectral aberrations of the Infrared Microspectroscopy Beamline to perform rapid imaging.