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The first picture is the direct laser spot when allowed to hit the wall without obstruction. Due to lens imperfection, some artefact is visible on the wall. To avoid complication, the laser is oriented so that the spots are aligned vertically, which is on the same axis as the obstructing needles that will be used.
In the last video, are you looking at the proper part of the diffraction pattern? There should be a broad diffraction pattern from the wires as shown in your previous videos. The bright red spot at the center shows a good diffraction pattern as expected but there is a possibility that it could be caused by some irregularity in the laser itself. The diffraction pattern beyond the bright red dot should be easily visible at a much shorter distance from the laser source.
Most online formulas describing double slit experiment only consider the distance between the center of the slits, while omitting the width of the slits. The cross sectional shapes of the slits/wires are mostly ignored. So, those are precisely what we need to investigate further.What do you expect to see if I use a better laser pointer?
I donít have a good quality laser for comparison.
You can improve the quality of the laser beam which will solve that problem.https://www.edmundoptics.co.uk/knowledge-center/application-notes/lasers/understanding-spatial-filters/