Figure 5 | Scientific Reports

Figure 5

From: QR code micro-certified gemstones: femtosecond writing and Raman characterization in Diamond, Ruby and Sapphire

Figure 5

Experimental setup of the femtosecond laser QR Code writing on gemstones and the microscope analyses. Inset (left) shows the custom QR code in dots with redirection to the website www.gemroyalty.com. CCD 01 analyzed the quality of the generated marks. CCD 02 was used to help with the set up of the parameters, such as the relative depth. SH is a shutter. MO is a microscope objetive. GP is a glan prism. BS is a beam splitter.

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