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Each "mirror" is a stainless steel surface with a mirrored finish.
Each mirror represents a single pixel.
(Or, rather, they divided a computer representation of each mirror).
The most recent DMDs have more than a million mirrors, each mirror roughly 14x14 microns in size.
The limitation in such designs is that each mirror in the array pivots on a single axis.
Rays entering the eye at an oblique angle encounter two surfaces of each mirror box rather than one surface.
Each mirror is oriented so as to affect two of the three dimensions; light passing orthogonal to a mirror flows through it without being affected.
An annular on-axis beam enters each mirror pair, is reflected from paraboloids and hyperboloids and exits to converge to a focus.
The aberration fields of each geometry will vary as a result of the tilt-direction of each mirror and the power distribution across the mirrors.
The orientation of each mirror is random, which is important, say the scientists, because it provides the best possible sampling for the algorithm to reconstruct the image.
Once I grew used to doing everything slowly and checking each mirror before moving, the Bessacarr was easy, even fun to drive.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com