They then illuminated the green laser beam from the side with blue light of 450 nm. As a result, they were able to create a shadow that was visible to the naked eye, and it was confirmed that it ...

When the green laser passed through the ruby crystal, it created a region that absorbed more blue light, effectively casting a "shadow" shaped exactly like the green laser beam. This shadow was ...

paves the way for surprising applications in manipulating light with light. A visible "laser shadow" appears as a dark line against the blue background. Credit: R. A. Abrahao et al. The scientists ...