Research progress and application of air refractive index measurement technology based on laser interference

Air refractive index measurement technology based on laser interference has shown great application value in many fields, especially in laser ranging, precision manufacturing and integrated circuit manufacturing equipment. With the help of air refractive index measurement technology, the measurement problems in many fields can be solved. In this paper, the research progress of indirect measurement method, synthetic pseudo wavelength method, F-P cavity method, variable cavity length method and optical frequency comb measurement method are introduced, and the advantages and disadvantages of various measurement methods are analyzed. Compared with the indirect measurement method, the direct measurement method based on laser interference technology has higher measurement accuracy. Finally, the current application status of air refractive index measurement technology is introduced, and its future application prospect and development trend are described in detail.