Back in the early days of lasers (when they were "a
solution looking for a problem" - over 30 years ago) I
saw a setup that produced a steerable laser using little
mirrors (about 5mm square) mounted on piezo-electric
arms.  The flexing of the piezo element caused the angle
of the mirror to change, and having a pair set at
rightangles gave 2D scanning.  Because the mirrors were
small (=lightweight), and there was no magnetism
involved, the frequency response was very good indeed.
What I saw was an oscilloscope trace projected about a
metre square, using very little electronics to drive it.

Cheers,

Howard Winter
St.ALbans, England

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