Abstract：The inter-satellite laser interferometers have a longer interference arm (106 km) than the ground interferometer and can detect gravitational waves in lower frequency bands (0.1 mHz - 1 Hz), which is of great significance in astronomy research. The inter-satellite laser interferometer has a typical structure of a responsive heterodyne interferometer, and its essence is an optical phase-locked loop. In this work, the simulated inter-satellite laser interferometer is built on the ground, and the frequency (phase) of the slave laser is successfully locked to the frequency (phase) of the stabilized master laser. The results show that the locking time is more than 20000 s, which meets the detection requirement of low-frequency signals. The interferometer has no coarse errors under different conditions of shorter and longer displacements. The noise caused by environmental disturbances such as temperature and air pressure is the key factor that restricts the accuracy of the interferometer.
2024, Vol. 45 
