Laser Technology in Creation of DCAM Proofs

Higashiyama

On his website, Rick Tomaska has a good (though now somewhat dated) overview of the history of proof coin production:

https://www.randicoins.com/store/pc/CameoHistory-d21.htm.

His discussion ends prior to the introduction of laser technology. In particular, he describes the following evolution which led to far more frequent DCAM coins:

From post-war through 1972, dies were acid treated, then polished, leading to a DCAM for only the very earliest strikes

Beginning in 1973, dies were sandblasted, then polished, then chrome coated, leading to a more dramatic DCAM effect and a more durable die, so that far more (indeed, most) coins were DCAM.

However, he stops there.

Does anyone have a reasonably detailed discussion of the history of laser technology in US proof coin production? The US mint and other sources describe the introduction of new, advanced, software guided laser technology in 2013.

However, it is not clear whether 2013 marked the first time than laser technology was used, or whether this was simply a significant upgrade to a prior laser approach.

Can anyone recommend a resource to fill in the gap between 1973 and 2013 in the US mint proof coin production methodologies?

Thanks!

Cameonut

I don't and would be interested in the latest technologies used myself.