Experiments with high bandwidth segmented mirrors

Physics – Optics

Scientific paper

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Adaptive Optics, Laser Outputs, Light Transmission, Mirrors, Optical Correction Procedure, Wave Front Deformation, Bandwidth, Degrees Of Freedom, Design Analysis, Feedback Control, Optical Equipment, Power Gain

Scientific paper

Attention is given to the shortwave adaptive optical systems required for the ground-to-space transfer of laser power. It is noted that these systems require high temporal bandwidth wavefront correction elements with between 1,000 and 10,000 degrees of freedom. A description is given of a prototype segmented mirror whose wavefront correction capability can match these requirements. In discussing the dynamic bandwidth, it is noted that the segmented mirror actuators only need to provide sufficient force to react against the inertia of the segment and provide the appropriate dynamic bandwidth. This is in marked contrast to the deformable mirror, where additional forces must be produced to deform the mirror faceplate. Low frequency structural resonances can be eliminated, making possible control loops of higher gain and bandwidth. What is more, actuator materials can be selected for linearity and low power dissipation, further reducing design difficulties.

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