Digital micromirror device and kinematically tunable wavelength filter-based imaging systems

An inverse spatially offset Raman spectroscopy system, comprising:

• an excitation source providing a beam;
• a digital micromirror device arranged downstream from the excitation source in a beam path;
• the digital micromirror device comprising a plurality of mirrors;
• an objective lens located downstream from the digital micromirror device that is adapted to impart an excitation area onto a sample;
• a second digital micromirror device or an area limiting filter located downstream in the beam path from the objective lens that only allows a Raman signal emerged from subsurface material, formed from a smaller cross-sectional area of the beam, to pass therethrough, wherein the smaller cross-sectional area of the beam is 50 percent or less of the cross-sectional excitation area transmitted to the second digital micromirror device or the area limiting filter;
• and
• a spectrometer located downstream from the second DMD or the area limiting filter that analyzes the collected Raman signal.

An inverse spatially offset Raman spectroscopy system, comprising:

• an excitation source providing a beam;
• a digital micromirror device arranged downstream from the excitation source in a beam path;
• the digital micromirror device comprising a plurality of mirrors;
• an objective lens located downstream from the digital micromirror device that is adapted to impart an excitation area onto a sample;
• a second digital micromirror device located downstream in the beam path from the objective lens that only allows a Raman signal emerged from subsurface material, formed from a smaller cross-sectional area of the beam, to pass therethrough, wherein the second digital micromirror device reflects an annular ring of light to a barrier such that the light does not reach the spectrometer;
• and
• a spectrometer located downstream from the second DMD that analyzes the collected Raman signal.