I am trying to align light from an optical fiber in an imaging assembly. Currently the optical fiber is outside of the cryostat and the light is coupled in through a window and the fiber is outside the cryostat. I am investigating putting the fiber and all the optics inside the cryostat, but I will need some way to position the fiber at 2.8 K with ~1 um accuracy over about 500 um travel in x, y, z, and would like the positioner to have as small a package as possible. My only choices seem to me magnetoresistive inchworms or stepper motors, neither of which is very small. Any advice on what to use or where to look?
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