Beam not coming through Lens

[ednisley]

@MikeyH

Front surface glass mirror, like in a telescope?

Yes, but …

The thin aluminum surface in ordinary mirrors can’t handle the power density of an unfocused laser beam and the underlying glass typically isn’t intended for high thermal stress.

Laser-rated mirrors tend to be solid molybdenum or gold-coated silicon for high heat conductivity and stability.

[MikeyH (Mike Hembrey)]

Interesting!

[jkwilborn (Jack Wilborn)]

Russ polished a set of brass disks and used them in his machine. They actually worked quite well for brass mirrors.

Here’s one of his video using stuff from Amazon.

RDWorks Learning Lab92 Fitting ebay Copper Mirrors Part 1

[Fred (Frederick Heim)]

The 3rd mirror only needs to be off a little to miss the opening in the nozzle.