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RE: Anyone used an induction heater to re-activate the getter?

Posted by pictureguy (A) on February 25, 2021 at 23:58:58

In Reply to: RE: Anyone used an induction heater to re-activate the getter? posted by AmadeusMozart on February 25, 2021 at 23:48:23:

When I worked making low frequency quartz oscillators, we had an optical flat which I think was Zerodur. 1/4 wqve? 1/8 wave? We used it as a reference to maintain grinding tables for making quartz (harder than the law allows) wafers for the manufacture of tiny tuning forks....

Aluminum is prone to oxidation. In a more sophisticated process, you might want to, and without breaking vacuum, apply a very thin coat of Silicon as an anti-reflective coating. Or something else to passivate the surface. I don't know common practice in telescope mirrors.

The OLD mirror can be taken off the substrate using something like Phosphoric Acid or another aluminum etch. Maybe Potasium Hydroxide? NO abrasives or anything else touching the surface.
the layer shouldn't be more than a micron or so thick, anyway.

If you are within driving range of me, I'd love to come watch.....

Than if possible, heat the substrate in a decent vacuum (DP not needed in this case) in order to outgas all the moisture.
Too much is never enough

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