Patent ID: 9097674
Filing Date: 2015-08-04
Classification: G01J,G01N

Abstract:
1. A device for detecting a resonant nonlinear optical signal induced in a sample of a type comprising a resonant medium and a non-resonant medium forming an interface, the device comprising: an emission source of at least one first excitation light beam, called a pump beam, at a first given angular frequency ω a first optical module for detecting a first nonlinear optical forward CARS signal resulting from a first interaction of said pump beam with the sample when said pump beam is incident on the sample along an optical axis and intercepts the sample at a given position of a transverse interface between the resonant medium and the non-resonant medium of the sample; means of reflection of said pump beam, arranged in such a way that said reflected pump beam intercepts said transverse interface substantially at the same position as said incident pump beam; a second optical module, separate from the first optical module, for detecting a second nonlinear optical forward CARS signal resulting from a second interaction of said reflected pump beam with the sample; a processing module for processing optical signals detected by said first and second detection modules, comprising the calculation of a difference in detected signals, the difference being characteristic of a vibrational or electronic resonance of the resonant medium.