High performance telescope

A method of directing electromagnetic radiation along an optical path of a telescope, the method comprising:

• directing electromagnetic radiation to a primary mirror configured to receive and reflect electromagnetic radiation along the optical path;
• directing electromagnetic radiation from the primary mirror to a secondary mirror configured to receive electromagnetic radiation from the primary mirror and to reflect electromagnetic radiation along the optical path;
• directing electromagnetic radiation from the secondary mirror to a tertiary mirror configured to receive electromagnetic radiation from the secondary mirror and to reflect electromagnetic radiation along the optical path;
• moving the secondary mirror along a first axis with a first actuator;
• and
• moving the tertiary mirror along a second axis with a second actuator,
• wherein the first actuator and the second actuator are configured to move the secondary mirror and the tertiary mirror along respective axes in a synchronized manner to focus electromagnetic radiation from the primary mirror, wherein the telescope is configured to limit root mean square wavefront on-axis error below 0.15 waves @1.055 um over entire 0.3 km to infinity range.