Generation of single-cycle terahertz pulse using Cherenkov phase matching with 4-dimethylamino-N'-methyl-4'-stilbazolium tosylate crystal

摘要

This is the first report of single-cycle terahertz (THz)-wave pulse generation with a wide band ( over 6 THz) and a high dynamic range ( over 70 dB) using an organic nonlinear optical crystal, 4-dimethylamino-N'-methyl-4'-stilbazolium tosylate ( DAST), and the prism-coupled Cherenkov phasematching method. The prism-coupled approach allowed the use of a DAST crystal as a Cherenkov-type emitter for reduced light absorption by the crystal, resulting in the generation of single-and half-cycle THz pulse shapes, which were detected using dipole and bow-tie antennas, respectively. The resulting THz pulse generation is suitable for various THz-wave application technologies, such as tomography. (C) 2017 The Japan Society of Applied Physics