Patent ID: 6975789

Claim:
A dynamically configurable retroreflector comprising: first and second flat mirrors, fixed at a particular included angle with respect to one another, said first and second flat mirrors defining an intersection axis; a third flat mirror mounted for rotation about a rotation axis parallel to said intersection axis; and an actuator coupled to said third flat mirror configured to provide first and second angular positions about said rotation axis, said first angular position being such to define an included angle of approximately 90° between said first and third flat mirrors so that an incident beam is reflected off the third flat mirror and the first flat mirror to emerge along a first path that is 180° to the incident path, said second angular position being such to define an included angle of approximately 90° between said second and third flat mirrors so that the incident beam is reflected off the third flat mirror and the second flat mirror to emerge along a second path that is 180° to the incident path, and is parallel to and displaced from the first path.