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EntranceBeamExpander_4x1

1) Mount the Thor_ACN254-050-B:1 lens in its lens tubes ensuring that its curved sides will point inwards when assembled.
2) Assemble the cage from thorlab parts including Thor_AC254-200-B-ML mounted lens. Set the lens cage plates approximately 141mm apart.
3) Shine a test laser beam into the beam expander and set the distance between the plates such that the beam is collimated.

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