| 摘要 |
In order to produce on the table of a diamond gemstone, an information mark which is invisible to the naked eye using a x10 loupe, an ultraviolet laser having a wavelength of 193 nm is used in association with a mask irradiate the surface of the stone at a fluence of less that 2 J/cm2 per pulse and with not fewer than 100 pulses, in the presence of air which reacts with the diamond and causes the mark to be formed without any darkening which is visible when viewing a microscope.
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