Ultrafast Infrared Spectrometry by the Beam Scanning across the PtSi Focal Plane Array

Time-resolved infrared spectrometry was conducted by using a PtSi focal plane array. A reflection grating dispersed the probe beam in the horizontal direction, and a galvano - mirror scanned the beam in the vertical direction. Consequently, the spectral and temporal data could be measured by the two-dimensional PtSi array. The spectra of the flowing gases were measured in the 2.8-4.6- mum wavelength range at 80- mus intervals.