Long-wavelength infrared detection and image processing using a long-wavelength infrared light source

摘要

The infrared detection system includes the following elements. The laser light source supplies radiation for irradiating the target (5). This radiation is tuned to at least one wavelength in the fingerprint region of the infrared spectrum. The detector (32) detects the radiation backscattered from the target (5). The analyzer determines the presence of a predetermined volatile compound from the presence or absence of a signal detected at the at least one wavelength. Related detection methods are also provided. In an embodiment, the laser light source is tunable over multiple wavelengths and the detector includes a hyperspectral image processing system. The laser light source is an optical parametric device, and includes a laser gain medium for generating a pump beam in a pump laser resonator, a pump laser light source, and a nonlinear medium composed of a ZnGeP2 (ZGP) (zinc germanium phosphide) crystal. May have. When stimulated with an excitation beam, the ZnGeP2 (ZGP) crystal is adapted to generate signal light having a wavelength in the fingerprint region of the spectrum and idler light having a wavelength in the mid-infrared region of the spectrum. The laser gain medium and the ZnGeP2 (ZGP) crystal are placed in the resonator of the excitation wave.