A large-aperture, reactionless Fast Steering Mirror (FSM) is described and modeled, and performance data are presented. The FSM optical element is 24 cm in diameter and is capable of +/- 3 mrad angular stroke in both azimuth and elevation. Dedicated position sensors provide feedback to enable two-axis closed-loop operation at frequencies greater than 1 kHz. The system is modeled as a set of coupled differential equations, from which performance predictions can be made. The performance of the system is presented in terms of spectral power consumption, spectral reaction attenuation, and closed-loop behavior. Closed-loop performance is characterized in terms of open-loop, closed-loop, and error attenuation transfer functions. Comparison to predictions from the dynamic model are made where applicable.
David L. Kaplan,
"Fast steering mirror performance measurements", Proc. SPIE 1920, Active and Adaptive Optical Components and Systems II, (25 August 1993); doi: 10.1117/12.152659; https://doi.org/10.1117/12.152659