Optical control equipment as follows: (a) Equipment specially designed to maintain the surface figure or orientation of the ‘space-qualified’ components specified above. (b) Steering, tracking, stabilization and resonator alignment equipment as follows: 1. Beam steering mirror stages designed to carry mirrors having diameter or major axis length greater than 50 mm and having all of the following, and specially designed electronic control equipment therefor: a. A maximum angular travel of ±26 mrad or more; b. A mechanical resonant frequency of 500 Hz or more; and c. An angular ‘accuracy’ of 10 μrad (microradians) or less (better); 2. Resonator alignment equipment having bandwidths equal to or more than 100 Hz and an accuracy of 10 μrad or less (better); (c) Gimbals having all of the following: 1. A maximum slew exceeding 5°; 2. A bandwidth of 100 Hz or more; 3. Angular pointing errors of 200 μrad (microradians) or less; and 4. Having any of the following: a. Exceeding 0,15 m but not exceeding 1 m in diameter or major axis length and capable of angular accelerations exceeding 2 rad (radians)/s 2 ; or b. Exceeding 1 m in diameter or major axis length and capable of angular accelerations exceeding 0,5 rad (radians)/s 2 .