Optical Alignment Device

[MichaelG.]

I was intrigued by this interesting design:
https://www.huberlab.org/resources/opti ... nt-device/

It works on the same basic principle as an Engineer’s tool devised by the great Dan Gelbart
and featured a couple of minutes into this video:
https://youtu.be/otSjut1iGGk?feature=shared

MichaelG.
.

Edit: __ More information here:
https://opg.optica.org/boe/fulltext.cfm ... &id=395204