Abstract
The quality of the output signal of the laser gyro is closely related to the loss of the high mirror. At present, the research on the total loss of the high-reflection film has been quite perfect. In order to further study the optical properties of the high-reflection film, the total loss of the high-reflection film can be refined into three parts: transmission loss, scattering loss and absorption loss. Starting from the current research situation at home and abroad, this paper mainly introduces three methods, including spectrophotometer method, DF transflectometer and cavity ring-down technique, and discusses the measurement principles of these three methods. The development status and accuracy level of transmittance measurement technology, and the advantages and disadvantages of these three methods are analyzed, and the methods to improve the measurement accuracy and the possible development direction in the future are pointed out. Finally, other common methods of transmittance and reflectance measurement and the corresponding measurement accuracy are introduced.
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