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A similar unit in red was also on the bench with the same nonrotation
problem, and as it turned out from the same cause. In that case I was
able to shoot some DeOxit into the back of the motor and prod the brushes
and motor around just enough to get the motor to run a little, after which
it pretty much self-cleaned and continued running. With two units
at least temporarily working again, I aimed them both at the ceiling.
White light through the grating material makes little rainbow spreads,
but because the laser output is a single wavelength, we get dots.
The matrix comes from the fact that each first-order split gets split
again in two axes and those get split again, and so on, with a certain
intensity loss every time. Then *that* whole pattern hits the second
holo grating. With the axes in relatively close alignment, the
pattern sort of resembles square pillows, or chiclets, or something.
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