DEVICE FOR QUANTITATIVELY DETECTING CARBON-14 ISOTOPE USING DOUBLE-WAVELENGTH METHOD, AND SPECTROMETER

A device for quantitatively detecting carbon-14 isotope using a double-wavelength method, and a spectrometer. Two mid-infrared laser beams having different wavelengths are locked on a cavity of a sample chamber (15), the two beams are guaranteed to be collinear, and the cavity length of the cavity is adjusted by means of a cavity length adjustment unit (17) to tune a mode frequency of the cavity and further tune the frequencies of the two mid-infrared laser beams, such that the frequencies of the two mid-infrared laser beams simultaneously match different energy levels of a target isotope molecule; once the frequencies of the mid-infrared laser beams simultaneously match the energy levels of the target isotope molecule, the target isotope molecule is excited simultaneously by the two mid-infrared laser beams, and a cavity output signal of a second mid-infrared laser beam passing through the cavity is detected. That is to say, because excitation of a target isotope molecule and spectrum detection require simul