What is the proper way to mount the TECHSPEC Monolithic Reflective Beam Expanders (Mark I)?

These laser beam expanders offer two different mounting options. There are ¼-20 through holes, which can hold the laser beam expander on its side so the optical axis of the part is parallel to your table. Additionally, there are 6-32 threaded holes on the bottom of the laser beam expander that can also be used.

Ideally, they would be mounted to a goniometer to reach the optimal alignment with respect to your input beam in order to reach the specified wavefront performance. However, in cases where a user is looking to mount these laser beam expanders without any alignment compensation, mounting the laser beam expander against either of the ideal banking surfaces noted on the downloadable web drawing would be best.