Laser-induced Dynamic Gratings -

: Ionization in gases or solids to create high-density electron patterns.

(LIDGs) are temporary optical structures created when two or more coherent laser beams interfere within a material. Unlike permanent gratings etched into glass, these "transient" patterns exist only while the light is present, making them vital for real-time optical processing. How They Work

: Localized heating that changes the medium's refractive index.

: Two laser beams intersect in a photosensitive medium (solid, liquid, or gas).

: The resulting interference pattern creates a spatial distribution of light intensity. This triggers physical changes in the material, such as:

: A third "probe" beam hits this temporary structure and is diffracted, allowing researchers to measure the material's internal dynamics in real-time. Key Applications Laser-Induced Dynamic Gratings | Springer Nature Link

: Spatially varying excitation of atoms or molecules.