However, the “laser shadow effect requires a ruby to mediate” it, the scientists wrote in the study, “which raises the interesting question of whether the photons in the object laser ...

The laser shadow effect is a consequence of optical nonlinear absorption in the ruby. The effect occurs because the green laser increases the optical absorption of the blue illuminating laser ...

The effect occurs because the green laser increases the optical absorption of the blue illuminating laser beam, creating a matching region in the illuminating light with lower optical intensity.