Laser Engraving Fluorescence
Fluorescence of a laser engraving mark on a white plastic card shows how the laser modified the molecules to create a contrast in the zones of the laser mark. Image details: 20x/0.5 objective, 12V 100W Halogen Lamp and filter set Ex400-440 BS460 Em 470-900. The 697×526-μm image is an extended focus from 45 Z-Slides (65.13 μm in total). [OPN 2021 Photo Contest Winner]
—Jose Manuel Martinez Lopez, Quimica Tech, Chihuahua, Mexico