Fig. 1. Schematic diagram of TRPLG ring cavity

Fig. 2. Schematic diagram of combining prism

Fig. 3. Normal and abnormal data of TRPLG variable-temperature experiments

Fig. 4. Angle of light combination

Fig. 5. Simulation interferograms of the different transverse modes

Fig. 6. Schematic diagram of cat's eye reverse device

Fig. 7. Schematic diagram of experimental system

Fig. 8. Interference spot of the different transverse modes detected by CCD

Fig. 9. Interference spots of TRPLG detected by CCD

Fig. 10. Offset of the ideal light path at high and low temperature

Fig. 11. Schematic diagram of the aperture structure and repair method