Fig. 1. Structural diagram of four-frequency differential laser gyroscope

Fig. 2. Differential polarization loss versus parameters of resonator. (a) s-polarized reflectivity r_s; (b) p-polarized reflectivity r_p; (c) reflection-induced retardance Δ of s- and p-polarization; (d) non-coplanar folding angle θ

Fig. 3. Variation of differential polarization loss when sum of reflection-induced retardances of four mirrors is 0 and reflection-induced retardances of four mirrors, positive and negative, wipe one another out. (a) +-+-; (b) ++--

Fig. 4. Variation of differential polarization loss when only sum of reflection-induced retardances of four mirrors is 0