Terahertz generation is a research area focused on the generation, manipulation, and detection of terahertz (THz) waves, which lie in the electromagnetic spectrum between microwaves and infrared light. Terahertz waves have unique properties that make them useful for a variety of applications, including imaging, sensing, and communication. Researchers in this area are developing new techniques and technologies to efficiently generate and control terahertz waves for practical applications in medicine, security screening, and telecommunications. Some common methods for terahertz generation include optical rectification, photomixing, and terahertz quantum cascade lasers.