No, it’s a DIY Michelson interferometer by the Celtic Mad Scientist.

In a standard Michelson interferometer, the beamsplitter would actually go at 90º to the shown orientation, so that each beam hits a mirror, but it’s all good. If your light is polarized, you’ll want to make sure that’s vertical, lest you be near Brewster’s angle when you bounce off the beam splitter.

Homer says, “Safen up! Do not look into laser with remaining eye”

Don’t end up like the Russian Ravers who were injured when the organizers erected a tent and used the lasers “indoors.”