Power and wavelength are one of the most basic parameters of lasers, and almost all laser applications require clear wavelengths and power/energy. The measurement of laser power and energy mainly involves thermopile technology and pyroelectric technology A thermoelectric stack is a power measurement element that measures power through temperature changes. The structure of a thermoelectric stack is composed of two or more thermocouples connected in series, and the thermoelectric potential output by each thermocouple is superimposed on each other, used to measure small temperature differences or average temperatures to obtain laser power Pyroelectric materials generate current when heated. When a laser heats a polymer electret at a certain heating rate, the previously "frozen" polarized charge is released, which is called pyroelectricity. Thermoelectric pile is a temperature measuring element that can be used to measure laser power or energy The measurement of laser wavelength can be achieved through a spectrometer or monochromator, which generally has lower costs but slightly lower measurement accuracy. Laser wavelength meters based on monochromator technology have high measurement accuracy