Fibre Bragg grating stopband profile trade-off for temporal spectral astronomy

Temporal spectral astronomy is a field in which the spectra of astrophysical phenomena can carry spectral lines that exhibit very small variations on timescales as short as milliseconds. These variations nevertheless stay unresolved due to the limitation in temporal resolution of current instruments to the subminute scale [1]. The main issue at present is that both a high spectral resolution and a high temporal resolution cannot be obtained at the same time. This leads to incomplete or unclear theoretical descriptions of some of the most interesting phenomena in astronomy today and their related astrophysical processes.