Centre National De La Recherche Scientifique

Centre National De La Recherche Scientifique-cnrs

David Gachet

Hervé Rigneault

Sophie Brustlein

Franck Billard

A method and a device for detecting a resonant non-linear optical signal induced in a sample including a resonant medium and a non-resonant medium forming an interface is disclosed. The device includes an excitation light beam that intercepts the sample along an optical axis. The device further includes a first optical detection module for detecting a nonlinear optical signal resulting from the interaction of the beam with the sample, and a mirror that reflects the excitation beam. The device further includes a second optical detection module for detecting a nonlinear optical signal resulting from the interaction of the reflected excitation beam with the sample, and a processing module for processing the optical signals, detected by the first and second detection modules. Processing the optical signals includes calculating a difference in the detected signals, the difference being characteristic of a vibrational or electronic resonance of the resonant medium.

Method for detecting a resonant nonlinear optical signal and device for implementing said method

A method and device for detecting a resonant non-linear optical signal induced in a sample, the sample including a resonant medium and a non-resonant medium forming an interface. The device includes an emission source of at least one first excitation light beam, called a pump beam, at a given angular frequency &#x3c9;for the excitation of the resonant medium of said sample, an optical detection module for detecting a non-linear optical signal resulting from the interaction of said pump beam with an axial interface between the resonant and non-resonant media of the sample, in at least two symmetrical directions ({right arrow over (k)}, {right arrow over (k)}') relative to the optical axis of said excitation beam incident in the sample, and a processing unit for processing signals (I({right arrow over (k)}), I({right arrow over (k)}&#x2032;)) thus detected, allowing the difference between said signals to be obtained.

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Beaumont-les-Valence, France

David Gachet