Spectrometer

The present disclosure relates to a spectrometer comprising: an excitation module including a laser emitter; an optical module defining an optical path and comprising an objective lens, a dichroic sheet, a slit and a dispersion element which are sequentially arranged from front to back along the optical path; a detection module comprising a light sensing element positioned behind the dispersion element; and a calibration module comprising a calibration light source. The calibration light source can emit a calibration light beam with a specific spectrum; an excitation light beam emitted by thelaser emitter is reflected by the dichroic sheet and then is emitted towards the objective lens along the optical path, and a calibration light beam emitted by the calibration light source passes through the dichroic sheet and then irradiates towards the slit along the optical path; the spectrometer has a working mode and a calibration mode; in the working mode, the excitation module works, and the laser emitter emits the