Structured light passing through a noisy environment gets distorted (a), but if another unstructured beam also gains the same distortion, the effect can be undone by mixing them in a nonlinear crystal (b). (IMAGE)

SPIE--International Society for Optics and Photonics

Structured light passing through a noisy environment gets distorted (a), but if another unstructured beam also gains the same distortion, the effect can be undone by mixing them in a nonlinear crystal (b).

Caption

Structured light passing through a noisy environment gets distorted (a), but if another unstructured beam also gains the same distortion, the effect can be undone by mixing them in a nonlinear crystal (b). Using difference frequency generation, the structured beam is automatically restored without the need for any knowledge of the aberration, for a nonlinear form of adaptive optics that works at the speed of light. 

Credit

B. Sephton (Università degli studi di Napoli “Federico II”).

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