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Transient Grating Spectroscopy
In transient grating spectroscopy, two laser beams can detect atomic-level objects and events. The method is used for materials characterization in the field of metrology and is classified as a non-destructive investigative technique because the sample is not damaged in any way by inspection.
The two light beams create an interference pattern when they interact with one another. This is a function of light’s wave physics and is a similar phenomenon to the patterns caused by two or more wave directions meeting on a water surface.
Laser light beams create a temporary interference pattern when they interact with one another, which is also known as transient grating. Although the pattern moves, it also repeats at regular intervals. These repeated instances of the transient grating are also known as Talbot planes. ....

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