Optical imaging of mineral species using hyperspectral modulation transfer techniques

摘要

A method of imaging a sample containing a target mineral species is provided. The method includes probing the sample with a pump beam and a Stokes beam having a tunable frequency difference, and detecting an optical response of the sample resulting from a transfer of said modulation between the pump beam and the Stokes beam. The probing is scanned spatially and spectrally, thereby obtaining hyperspectral data. Correlation with a known Raman resonance of the mineral species and with a non Raman-resonant contribution to said optical response allows building an image of the sample mapping different species within the sample.