Abstract
The paper deals with the investigation of ultrafast radiation phenomena using a dynamic spectrograph. The general relations previously derived by the authors on the characterization of the spectral properties of incident non-stationary radiation, as well as on the derivation of the input spectrum from the square-law detector time-dependent output spectrum, are applied in the present paper to examples that are of importance in ultrashort phenomena. In particular, single bandwidth-limited pulses and a train of pulses are studied. The use of a grating and a realistic prism spectrometer are considered. The theoretical and experimental investigations take into account the influence of the 'uncertainty product' of the spectrometer. For a single ultrashort laser pulse, the time-dependent spectrum was determined experimentally; the pulse was found to be nearly bandwidth-limited.
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