That requires the next phase I'm waiting on: nm-scale lithographic printing on silicon.
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i mean, they actually have electron beam lithography, it's a thing, right? just it's not very fast
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Not sure if it can be used for producing functional chips yet. And almost surely not on your desk/bench.
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i recall talking to someone who worked on these systems; they had gotten them to within ~1-2 orders of magnitude of UV litho throughput
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plus they use them to make the masks for UV lithography, iirc
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... definitely not on your desk, though.
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A friend did something similar, but not nm-scale (just for decorative purposes). You kind of need a patterned surface for tracking though.
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I'm not sure you could sensibly modify a typical pickup to track without a pre-groove to lock on to (i.e. blank disc).
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There might be some other side channel you could track by...?
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As far as I know, without the optical feedback from the pickup itself onto the pre-groove, focus are tracking effectively become open-loop.
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Angular tracking is a problem too (normal burners just don't care except roughly on average). Friend built some FPGA-based PLL thing.
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... which worked fine for visual purposes but for nm-scale tracking you really need some accurate angular feedback too.
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PLL with a small number of feedback markers and high quality OCXO might suffice?
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The tricky bit I guess is that you need a high angular feedback frequency to compensate for mechanical instability.
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