Filters near-infrared imaging

P. J. Treado, I. W. Levin, and E. N. Lewis, Near-infrared acousto-optic filtered spectroscopic microscopy A solid-state approach to chemical, Imaging. Appl. Sped. 46, 553-559 (1991). 

N. Gupta, R. Dahmani, and S. Choy, Acousto-optic tunable filter based visible-to-near-infrared spectropolarknetric imager, Opt. Eng. 41, p. 1033-1038,2002. 

For Raman microscopy, the most common spectrometer system consists of a visible laser coupled to a polychromator and a CCD detector, although near-infrared Fourier transform spectrometers cffe also used. The CCD detector can be used in a variation of Raman microscopy known as Raman imaging a special optical filter allows only one Stokes fine to reach the two-dimensional detector, which then contains a map of the distribution of the intensity of that line in the illuminated area. 

Figure 10 Near-infrared spectroscopic imaging. A series of A/images is acquired using a CCD-array camera, using optical filtering to step successively through the near infrared (800-1100 nm in this illustration). An Af-point near-infrared spectrum may then be reconstructed for each pixel in the image. Courtesy of Jim Mansfield.

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