How is the center wavelength of the laser defined and measured?

Generally, the laser center wavelength calibrated by Box Optronics products is the wavelength corresponding to the center position of the full width at half maximum of the spectrum measured at the rated power at a certain temperature. The full width at half maximum refers to the wavelength corresponding to when the intensity on both sides of the spectrum peak drops to half of the peak. difference. In general, the center wavelength is determined by the semiconductor material, but because temperature and current have a greater impact on the wavelength of the semiconductor laser, the laser center wavelength will drift with changes in current and temperature.