SpotOptics can provide Beam Expanders that can expand(/compress) the optical beam to test optical elements up to 120mm diameter.
Beam Expander BE-XS (center) with the External Calibration unit ECM-XS (left) and Optino-XS (right)
The same unit can be also used in Beam Compressor configuration.
Beam Expander contains optical elements whose effect/aberrations should be subtracted with the calibration. We provide the setup for calibration with our Beam Expanders.