HETERODYNE DETECTION DEVICE FOR IMAGING AN OBJECT BY RE-INJECTION

摘要

The invention relates to a detection device (1) for imaging an object (10), that comprises: a laser cavity (3) for transmitting an original light signal (3) at an original wavelength towards the object (10) in order to generate an evanescent wave at the surface of the object (10); a conversion means (11) adapted for converting the evanescent wave into a progressive signal; a re-injection means (12) adapted for injecting the progressive signal into the laser cavity in order to generate interference inside the laser cavity between the progressive signal and the original light signal; a detection means adapted for detecting the interference in order to determine the characteristics of the object; characterised in that the device includes a wavelength modification means (7) adapted so that the wavelength of the progressive signal injected into the laser cavity is different from the original wavelength.