I need one that can handle precise, quick movement. I'll be firing a laser at the rotating mirror 40-100 times per second and it needs to move each time.
I believe a lot of commercial laser imaging devices which project a laser beam in X and Y axis use a 45 deg mirror attached to an electromagnet like a speaker coil, then they drive the coil with an analogue voltage to move the mirror as required. If the mirror is very thin and light, your movement will be very quick and precise.
Anyone know of places to buy this kind of thing in NYC? I'm sick of shipping stuff from China ;pI love the optical sensor idea... have an opaque tab pass by it once per mirror rotation, yeah? Maybe I can source one from a discarded object. I believe old mouse wheels use this... what else?