Coherent terahertz-wave generation and detection over a wide frequency range using DAST crystals

摘要

Terahertz-frequency (THz) waves have shown potential for a wide range of applications. We have developed tunable THzwave sources using nonlinear optical crystals, which have several advantages, including frequency agility, wide tunability, high output , and high coherency. We found that the organic nonlinear crystal of 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) had particular potential for ultra-wide THz-wave generation from sub-THz to mid-infrared frequencies. Using DAST, we manufactured a coherent, tunable source (1-40 THz) with frequency agility. Moreover, we demonstrated THz-wave detection through up-conversion using DAST or MgO:LiNbO_3 nonlinear optical crystals, which provided a fast response, high sensitivity, and room-temperature operation.