Visible alignment accessory for IR interferometers

The bayonet interface snapped right into place, and the visible beam output made the rough alignment process so much easier than fumbling with an IR card. Having the IR reflective back surface is a nice bonus for fine-tuning later.

Getting my IR setup roughly aligned used to be pure guesswork, but being able to actually see the beam makes it so much faster. The bayonet interface clicks in solidly on my 4-inch mount, and the reflective back surface bounces enough light back for fine tuning.

Didn't realize how much time I was wasting squinting at the IR beam until I tried this. The visible output lines things up in seconds, and the reflective back surface makes it easy to check without tearing the setup apart.