With the increasing application of lasers in semiconductor, industrial processing, and medical fields, convenient and fast measurement of laser wavelength has become an urgent need. At present, there are roughly three types of instruments for measuring laser wavelength parameters. One type is a wavelength meter, which has simple functions, easy operation, and relatively high accuracy. However, it can generally only read wavelength data. When the laser has multiple wavelengths or a wide spectrum, the measurement may not be accurate; One type is scanningF-PThe cavity is mainly used to study the spectral shape of lasers, and generally does not provide absolute values of wavelength; Another type is spectrometer, through which we can conveniently monitor the wavelength, amplitude, and half width of the laser（FWHM）The variation of parameters such as the number of peaks over time.