FOURIER-TRANSFORM INTERFEROMETER WITH STAIRCASE REFLECTIVE ELEMENT

摘要

An apparatus for performing Raman spectral analysis of a sample is described, comprising a coherent light source, an first optical chain to direct the coherent light to impinge on the sample, a second optical chain to direct the scattered light onto a diffraction grating, and a third optical chain to direct the diffracted light onto detection array. The diffraction grating is a plurality of alternating-slope stairsteps, wherein the portion of the step disposed parallel to the base of the diffraction grating is disposed so as to be orthogonal to the path of the scattered light from the second optical chain. The zeroth-order fringe is selected by a slit and directed onto camera. The resultant interferogram is Fourier transformed to produce a representation of the Raman spectrum.

主权项

1. A spectrometer, comprising:
a diffraction grating comprising a first stairstep grating having a positive slope with respect to a base thereof, and a second stairstep grating having a negative slope with respect to the base thereof; a collimator disposed in an externally incident energy beam to direct the collimated beam to the diffraction grating at an off normal angle to the base of thereof; and a detector having a plurality of detection areas, the detector disposed so as to intercept energy specularly reflected by the diffraction grating.