High Rejection Ratio Tilted-Mirror Interferometer

This paper covers the tilted-mirror interferometer, which is an improvement of the similar configuration with parallel mirrors in several important parameters, such as: rejection ratio increase from 26 to 45 dB, the slopes of the transmission peaks increases from 4 to 40 dB/nm, and decreases several times the bandwidth at 3 dB. All the other parameters of nonmodulated light, such as 240-nm tuning range, tuning speed of 2 s/nm, tuning accuracy of 1 pm, 1-dB insertion loss, 0.2-dB flatness, 0.15-dB polarization-dependent loss are the same as in the configuration with parallel mirrors. The experiments have shown that the version with tilted mirrors has 80-nm/m tuning sensitivity to the gap change, slightly better than the configuration with the parallel mirrors.