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We present new developments of the laser-induced transient gratingspectroscopy (TGS) technique that enable the measurement of large area 2D mapsof thermal diffusivity and surface acoustic wave speed. Additional capabilitiesinclude targeted measurements and the ability to accommodate samples withincreased surface roughness. These new capabilities are demonstrated byrecording large TGS maps of deuterium implanted tungsten, linear frictionwelded aerospace alloys and high entropy alloys with a range of grain sizes.The results illustrate the ability to view grain microstructure in elasticallyanisotropic samples, and to detect anomalies in samples, for example due toirradiation and previous measurements. They also point to the possibility ofusing TGS to quantify grain size at the surface of polycrystalline materials.

Non-contact, non-destructive mapping of thermal diffusivity and surface acoustic wave speed using transient grating spectroscopy