Skip to main content
. Author manuscript; available in PMC: 2019 Jan 9.
Published in final edited form as: Phys Med Biol. 2018 Jan 9;63(2):025007. doi: 10.1088/1361-6560/aa9cfe

Figure 3.

Figure 3

A 4-F system with two galvanometer mirrors, one conjugate to the entrance pupil of the objective (position galvo), and the other conjugate to the focus (incident angle galvo), permitting one to independently manipulate the position and incident direction of a focused beam. The red beam travels along the central axis of the system with neither galvo tilted. The green beam is tilted by the position galvo, so that the ray ends up at an off-axis image point. The blue beam is tilted by the incident angle galvo, so it is incident at the image point at an off-axis angle.