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Agree - I think this is merely scatter from a poor focus beam and not interference at all.
When we did it, we used a brass filament (the ultra thin invisible stuff - thinner than a hair) and a slot laser cut in a brass plate, and even then the results were not very good. And that was using a lab WATT rated laser (not milli-Watt) and professionally cut components. I think you need to go a LOT finer.
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