I'm sure there are many hardening processes - from the modified COTS parts, all the way to presumably much more expensive custom substrates like: https://en.wik

I'm sure there are many hardening processes - from the modified COTS parts, all the way to presumably much more expensive custom substrates like: https://en.wikipedia.org/wiki/Silicon_on_sapphire https://en.wikipedia.org/wiki/Silicon_on_sapphire