Transient grating spectroscopy (TGS) is a time-resolved optical technique used to study the dynamics of materials, particularly in the fields of physics, chemistry, and materials science. This method allows researchers to investigate ultrafast processes, such as electron dynamics, phonon dynamics, and energy transfer mechanisms. ### Principles of Transient Grating Spectroscopy 1. **Grating Formation**: In TGS, two or more laser pulses are overlapped in a material, creating an interference pattern.
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