A novel optical approach to single-shot chemical imaging with high spectroscopic resolution is described with the use of a prototype dimension-reduction fiber-optic array. Images are focused onto a 30 X 20 array of hexagonally packed 250 mu m o.d. f /2 optical fibers that are drawn into a 600 X 1 distal array with specific ordering. The 600 X 1 side of the array is imaged with an f /2 spectrograph equipped with a holographic grating and a charge-coupled device (CCD) camera for spectral analysis. Software is used to extract the spatial/spectral information contained in the CCD images and deconvolute them into wavelength-specific reconstructed images or position-specific spectra that span a 190 nm wavelength space. "White light" zero-order images and first-order spectroscopic images of laser plumes have been reconstructed to illustrate proof-of-principle.
Matthew P. Nelson, Wendy C. Bell, Michael L. Mclester, and M. L. Myrick, "Single-Shot Multiwavelength Imaging of Laser Plumes," Appl. Spectrosc. 52, 179-186 (1998)