[Beowulf] Re: Interesting

Eugen Leitl eugen at leitl.org
Wed Nov 3 09:37:02 EDT 2010


On Tue, Nov 02, 2010 at 08:49:34PM -0400, Peter St. John wrote:
> deBeers laser-engraves serial numbers onto their (natural) diamonds (to
> counter the increasing gem quality of artificial diamonds made by, say,
> chemical vapor deposition). So how about laser engraving data onto cheap
> chemical vapor deposition thin diamond slices? (One of the ideas had been to
> make microelectronics substrates from diamond this way, since diamond
> conducts heat better than silicon).

There's a variant of microfiches which uses photoglass. 
Areas exposed to light produce crystal nuclei. The glass is
heated close to Tg at which stage those nuclei initiate
crystal growth.

Should have lots longer shelf half life than mere microfiches
which are good for about century or more under optimal storage
conditions.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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