that's what electron guns are for, right
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The tricky bit I guess is that you need a high angular feedback frequency to compensate for mechanical instability.
I.e. no matter how good your PLL is, one pulse per revolution isn't enough for nm-scale accuracy.
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To avoid need for precise even spacing of marks, could you have one primary pulse per rev and many minor ones...
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...and measure timing between each one (average over many revs) before start to get phase offsets for each to feed into PLL?
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