Design of fine pointing tip/tilt mirror of ATP system for free space optical communication

The two-dimensional fine pointing tip/tilt minor is a key component of the acquisition, tracking and pointing (ATP) system for free space optical communication. The mechanical design and model analysis was made to the tip/tilt mirror driven by the piezoelectric actuator and transmitted by the flexure hinge. The digital precise position controller was developed, which consisted of driving module, measuring module and control module. The test system was developed in laboratory, and the frequency and static performance of tip/tilt mirror were tested. Two measuring methods of the frequency were particularly introduced. The testing results indicate that the frequency of the tip/tilt mirror is about 1.5 kHz, the rational degree range is about ±2 mrad, the precision is about 1 μrad and the resolution is about 0.1 μrad.