Video 1.
Michelson Interferometer by Amrita Vlab (2013)
. Source. Shows the optical controls and alignment in more detail.
Video 2.
Michelson Interferometer by TSG Physics (2012)
. Source. TSG PHysiQuantum electrodynamics bibliographycs is the channel from the MIT Department of Physics Technical Services Group. In the video they produce a very clear round interference pattern.
This paper is in the public domain and people have uploaded it e.g. to glorious Wikisource: including its amazing illustrations.
Figure 1. . Source. Amazing 3D technical drawing from the 19th century!!!

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