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Walkoff In Nonlinear Optics

Author: Dr. William Grossman Wednesday, July 16, 2025
Suppose we send two beams of light, each with a different unique color, through a transparent crystal. The light in each beam can also have different polarizations. Furthermore, suppose that these two beams are incident upon the crystal at the same location and going in the exact same direction. Once in the crystal, will they continue to go in the same direction—equivalently, are they still angularly aligned? Even if they remain angularly aligned, must they remain exactly on top of each other as they propagate through the crystal— equivalently, do they remain spatially aligned? In general, the answers are no and no. More white papers