Synchrotron radiation is an electromagnetic wave emitted by relativistic electrons traveling in a strong magnetic field. It provides intense, highly collimated, highly polarized, pulsed, and extremely broadband light source, which is widely used in various research fields especially in the X-ray range. It can also be used in the infrared and terahertz range because it also has a strong spectral component in these regions. In this paper, I Introduce a new way to enhance the infrared and terahertz component of the radiation by far to several orders in the magnitude, using coherent synchrotron radiation. New light source technologies based on the coherent synchrotron radiation are being developed at UVSOR at Institute of Molecular Science, Japan, which will be powerful tools for terahertz applications. Using this light source, we can also utilize the coherence of the radiation for spectroscopy, which was difficult in the studies using normal synchrotron radiation.
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