This paper discusses the use of a three-mirror interference system for recording small linear displacements and as an interferometer system with a variable transmission band. The spectral transmission characteristics are determined in analytical form and at a quantitative level in parameters that are used in the theory of a Fabry-Perot interferometer. The results of the calculation are compared with the experimental data.
B. I. Troshin, "Formation of the spectral dependence of the transmission of a three-mirror interference system," J. Opt. Technol. 70, 655-657 (2003)