“…On the other hand, free carrier absorption and transient grating techniques are more advantageous for carrier lifetime measurements (as provide the depth‐integrated carrier density 8, 9) but still have limited spatial resolution. They have the potential for a simultaneous monitoring both of spatial and temporal features, what is very important for hydride vapour phase epitaxy (HVPE) grown GaN, as the material inhomogeneities, such as dislocations and point defects, are detrimental to the fabrication of reproducible high‐power Schottky diodes 10.…”