Patent ID: 7616307

Claim:
An optical modulation spectroscopy system comprising: a probe beam source; a probe beam directed at a sample to give rise to a reflected probe beam; a pump beam source; a modulator for modulating a pump beam; a modulated pump beam directed at a sample; a dispersive system for dispersing the reflected probe beam into constituent wavelengths to provide dispersed beams; and a detection system for detecting a plurality of the dispersed reflected probe beams, and for processing a signal corresponding to each, the detection system comprising: an array of detectors and a circuit, with a detector for detecting each of at least some of said dispersed beams; and wherein each detector produces as output an electrical signal which comprises both a DC signal, proportional to the reflectance of a dispersed beam and an AC modulated signal at the modulation frequency proportional to the modulation of the reflectance of a dispersed beam.