The Best in Science News and Amazing Breakthroughs
A black line across a region of blue illumination is the shadow cast by a green laser beam.Shadows are a natural consequence of opaque walls in an illuminated Universe.
When two beams of laser light are crossed in just the right way, the primary beam is unable to pass through the secondary – creating a shadowed line in the light that hits the opposite surface. They were using 3D modeling software to generate simple schematics for their experiments. In this software, the beam of light was represented as a solid cylinder that cast a shadow, and the physicists found that pretty funny… until they found it interesting.
The blue laser light was directed at one side of the ruby, where it passed through and cast a cool glow upon a screen, while a narrow beam of green laser light passed perpendicular to the first from another.Wherever the thin line of green light fell on the ruby's molecules, a complex dance of electrons rising and falling occurred.
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