  High time cadence Spectro Polarimetry allows the feasibility of studying
magnetic field evolution coupled with the plasma flows. Such a high cadence
solar spectropolarimetry if developed will allow one to study magnetic field
evolution in eruptive processes like solar flares, prominence eruptions, etc. A
single shot solar spectroscopy was recently demonstrated at Multi Application
Solar Telescope (MAST) at Udaipur Solar Observatory. The snapshot spectroscopy
is performed by sampling the pupil plane using the lenslet array to get
multiple images of the field of view (FOV), which are then collimated and the
collimated beam is made to pass through an FP Etalon in collimated mode. As the
distance from the FP axis increases, the peak transmitted wavelength shift
towards the bluer side. Using a prefilter with a full width half maximum (FWHM)
less than the free spectral range (FSR) of FP, combined with an imaging lens,
we can get multiple images of FOV on image plane with a blue shift in spectra
as we move radially outwards from the optical axis.
