Actuators to use for Mems lidar mirror?

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A galvanometer mirror designed for a laser light show will work. They are expensive and require a special driver.

It is much cheaper to make a rotating mirror for 360 degree scanning, as described here.

Or make or buy (Servocity.com) a pan platform, as shown here: https://www.eevblog.com/forum/projects/hobby-lidar-build/