Kavli Affiliate: James Bock
| First 5 Authors: Samuel S. Condon, Stephen Padin, James Bock, Howard Hui, Phillip Korngut
| Summary:
We describe a technique for measuring focus errors in a cryogenic,
wide-field, near-infrared space telescope. The measurements are made with a
collimator looking through a large vacuum window, with a reflective cold filter
to reduce background thermal infrared loading on the detectors and optics. The
vacuum window and cold filter introduce wavefront error which we characterize
using an autocollimating microscope. For the $200textrm{ mm}$ diameter
aperture $f/3$ space telescope, SPHEREx, we achieve a focus position
measurement with a $sim15 textrm{ }mu textrm{m systematic}$ and a $sim
5textrm{ }mu textrm{m statistical}$ error.
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