PHASE COMPARING INTERFERENCE IN

NANO-METER MEASUREMENT

Hou Wenmei  Qiu Huifu
The Graduate School Beijing, Shanxi Institute of Mechanical Engineering

Abstract: By combining an optical phase comparison method with a Zeeman-laser, a high resolution heterodyne interference measurement system has been developed. It can be used for direct measurement of the refractive index of air. The uncertainty of dn/n was confirmed by a great number of experiments to be no more than 5×10^-8.

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