Mr. Wei Jin Profile

Wei Jin

at National Institute of Metrology

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Proceedings Article | 7 March 2019 Paper

Automatic real-time compensation of wavelength of heterodyne interferometer

Wei Jin, Qi Li, Yushu Shi, Sitian Gao, Wei Li, Shi Li

Proceedings Volume 11053, 110533G (2019) https://doi.org/10.1117/12.2512162

KEYWORDS: Refractive index, Interferometers, Heterodyning, Humidity, Interferometry, Environmental sensing, Mirrors, Fabry–Perot interferometers, Beam splitters, Receivers

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Heterodyne interferometer is a nanometer measurement system that uses the laser wavelength as the working reference for length measurement. Under ideal conditions, the laser wavelength is the wavelength λ₀ of the light wave in the vacuum, but in practical applications, the laser wavelength will change with the influence of the air refractive index and the refractive index of air is greatly affected by the environment. This will have a great influence on the measurement results of the high-precision and high-resolution nano-displacement measurement system. Therefore, it is necessary to correct the air refractive index to compensate the laser wavelength. In this paper, the air refractive index in the initial measurement is obtained by using the Edlen empirical formula. Then the relationship between the current air refractive index and the initial air refractive index is obtained by using the wavelength compensation unit to achieve the automatic real-time compensation of the wavelength. The wavelength compensation component is mainly composed of an interference mirror and a fixed length etalon. Through the measurement of air refractive index and the experiment of compensation, the feasibility of the method is confirmed. The relative error after wavelength compensation is less than 0.03% relative to the relative error before compensation.

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