OMTech 60 W Laser: Mirror Cleaning

While I was puttering around inside the laser cabinet, I figured it was time to check the mirrors for cleanliness. The first two mirrors looked fine, but Mirror 3 needed help:

OMTech 60W laser mirror 3 cleaning - before
OMTech 60W laser mirror 3 cleaning – before

It turns out OMTech used molybdenum rather than gold-plated silicon or copper, trading off some reflectivity to reduce damage from over-enthusiastic cleaning with a vigorous circular motion.

A first pass with an optical wipe removed most of the crud:

OMTech 60W laser mirror 3 cleaning - during
OMTech 60W laser mirror 3 cleaning – during

Gentle touch-up with a little more isopropyl alcohol cleared the rest:

OMTech 60W laser mirror 3 cleaning - after
OMTech 60W laser mirror 3 cleaning – after

The focus lens required similar attention, but there is no way to get meaningful pictures of a transparent lens.

Realigning the mirrors went well (top before, middle during, lower after):

Beam Alignment Targets- 2022-08-06
Beam Alignment Targets- 2022-08-06

The diagonal results at Mirror 3 show the XY axes aren’t quite square, but AFAICT it’s close enough. The rightmost tape shows good beam centering in the nozzle and the Focus target shows excellent Z alignment over about 50 mm of travel.

Done!

One thought on “OMTech 60 W Laser: Mirror Cleaning

Spam comments get trashed, so don't bother. Comment moderation may cause a delay.

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s