Abstract
Recently, the technologies of emission and detection of terahertz (THz) electromagnetic waves by using femtosecond and nanosecond optical lasers have achieved great progress. The THz spectroscopy and imaging started to be applied to various fields such as characterization of various materials including bio-related molecules. In this review, we describe our recent results of the applications of the THz spectroscopy to the investigation of biomolecules after brief introduction of intense laser-induced quantum beam generation undergone in our institute.