Terahertz wavemeter based on scanning Fabry–Perot interferometer: accuracy and optimum designation

Abstract

The performance of terahertz wavemeter based on scanning Fabry–Perot interferometer is discussed in detail. In order to evaluate the absolute accuracy of this kind of wavemeter, the accuracy dependency on some key parameters of the wavemeter, such as the finesse, step size, interference order and noise level, is discussed quantitatively. Two different methods for determining the unknown wavelength are compared in their uncertainty of measurement results. Based on the above analysis, the optimum use of the wavemeter is discussed.

Keywords:

• terahertz wavemeter
• Fabry–Perot interferometer
• accuracy

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Basic Research Program of China (973) [grant number 2015CB755403], [grant number 2014CB339802]; the National High Technology Research and Development Program 863 [grant number 2011AA010205]; the National Natural Science Foundation of China [grant number 61107086], [grant number 61172010], [grant number 61471257]; the Natural Science Foundation of Tianjin [grant number 14JCQNJC02200]; the Science and Technology Support Program of Tianjin [grant number 14ZCZDGX00030]; the Specialized Research Fund for the Doctoral Program of Higher Education [grant number 2120032110053]; CAEP THz Science and Technology Foundation [grant number CAEPTHZ201304].