I have removed all optics except one mirror, one lens, and the interference platform. The platform can now rotate although rotation still remains unmeasured.

2.5 min exposure, Perfect split rotation

The new setup is giving grating lines but on a order of magnitude 100x the one we want. Images were taken at 5x magnification.

4 min exposure, Perfect split rotation.

The lines appear to be part of a large set of concentric circles. 40-25um between with a center near where the optical axis would hit the interference apparatus.