Per,

The problem is, of course, that very tight tolerances have to be held because of the long light-lever and the interaction of two deflection systems. As I mentioned earlier, the mirrors need only to be about a cm square, but since the voice coil must either be linear and have as long a throw as the image size demands, perhaps several meters (not realistic!) or must be rotary, I doubt a linear option can be considered. Using an already rotary HD head actuator seems to me to be considerably simpler than a complex mechanism to translate linear motion to some form of linear-to-angular translation.

Perhaps you can explain how this can be accomplished.

In order to have control over the image, I'd guess that the laser has to be modulated on and off with precision amounting to a small fraction of an arc-second.

More detail about the objective might be warranted.

RE