Full 3D+1 modeling of tilted-pulse-front setups for single-cycle terahertz generation: comment

Wang et al. [J. Opt. Soc. Am. B37, 1000 (2020)JOBPDE0740-322410.1364/JOSAB.379142] simulated terahertz generation by tilted-pulse-front optical excitation of a lithium niobate crystal and made predictions about the optimal generation conditions and spatial distribution of the generated terahertz beam. We point out that the formulas used by Wang et al. for the tilted-pulse-front optical pulse and optically induced nonlinear polarization are irrelevant to the conventional tilted-pulse-front configuration. The predictions made by Wang et al. appear inadequate for optimizing typical tilted-pulse-front experimental setups.