Figure 7
From: Terahertz-readable laser engraved marks as a novel solution for product traceability

Top: Confocal map of sample with edge; Bottom: Time of arrival (only pixels, whose signal has two valleys).
From: Terahertz-readable laser engraved marks as a novel solution for product traceability

Top: Confocal map of sample with edge; Bottom: Time of arrival (only pixels, whose signal has two valleys).