3D subsurface laser engraving for translucent minerals?

[Spin Operator]

3D Subsurface Laser Engraving works for clear glasses like Schott BK7 and B9 Borosilicate Glass.

How does one do the same for relatively translucent minerals?

I have read research papers on using lasers for tattoo removal and cancer radiation therapy.
However, I want to know how the laser's focal point can be fixed with precision inside the translucent materials to properly engrave.
Thanks for your help in advance.

 

[davenn]

you labelled you post with an "A" tag indicating post graduate level
so what papers have you been reading ?

I want to know how the laser's focal point can be fixed with precision inside the translucent materials to properly engrave.

lenses on the laser source ... same as used for multi layer read and write on a CD or DVD disk

 

[Spin Operator]

you labelled you post with an "A" tag indicating post graduate level
so what papers have you been reading ?lenses on the laser source ... same as used for multi layer read and write on a CD or DVD disk

Davenn
Read papers from leading journals

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2884836/

https://www.nature.com/articles/s41598-017-01724-1

I am trying to insert these
into gemstones, many of which are translucent and opaque.

Would appreciate any help, thanks.

 

[Tom.G]

I suggest you contact some Laser manufacturers. Here are a couple to start with.

https://www.coherent.com
https://www.troteclaser.com

Above found with: https://www.google.com/search?&q=laser+engraving+machine+for+gemstone

 

[davenn]

Above found with: https://www.google.com/search?&q=laser+engraving+machine+for+gemstone

they are all for surface engraving ... The OP is talking about internal engraving where the surface is left untouched
hence why he is asking about focussing distances ( as they are continuously changing

eg

the above 2 examples are etched within the blocks of glass/plastic ( not on the surface)

I bought one of dolphins ~ 2" sq and 3" high some years back for my wife ... looks really cool when lit from belowDave

 

[Andy Resnick]

3D Subsurface Laser Engraving works for clear glasses like Schott BK7 and B9 Borosilicate Glass.

How does one do the same for relatively translucent minerals?

I have read research papers on using lasers for tattoo removal and cancer radiation therapy.
However, I want to know how the laser's focal point can be fixed with precision inside the translucent materials to properly engrave.
Thanks for your help in advance.

Translucent materials may be tough to use due to scattering- you won't get nice well-defined focal volumes. Try sending a sample to an engraving company and see what they can do.