| 摘要 |
<p>The invention relates to a method and a device for detecting a resonant non-linear optical signal induced in a sample (805) comprising a resonant medium (61) and a non-resonant medium forming an interface, the device comprising: an emission source (801) of at least one first excitation light beam of a resonant medium, called a pump beam, at a first given angular frequencyωp, said pump beam being incident on a sample along an optical axis, and intercepting the sample at a given position of a transverse interface between the resonant and non-resonant medium, a first optical detection module (803) for detection of the nonlinear optical signal resulting from the interaction of said beam or beams with the sample, means of reflection (813) of said excitation beam or beams, the excitation beam or beams thus reflected intercepting said transverse interface substantially at the same position as the incident excitation beam or beams, a second optical detection module (806) for detection of the nonlinear optical signal resulting from the interaction of said reflected excitation beam or beams with the sample, a processing module (830) for processing the optical signals detected by said first and second detection modules, comprising the calculation of a difference in the detected signals, the difference being characteristic of a vibrational or electronic resonance of the resonant medium.</p> |
