Abstract
The free electron laser (FEL) is widely regarded as the core technology of the fourth-generation light source in the international scientific community, as the development of such technology is making remarkable progress in recent years. FEL offers scientists the means to probe the nano-scale and outer-space world beyond the fullest extent of the existing scientific boundary. Compared to the cost of building a large-scale advanced research facility, the investments of the most ambitious FEL facilities, such as the Linac Coherent Light Source (LCLS) in the U.S. and SPring-8 Angstrom Compact Free Electron Laser (SACLA) in Japan, are much more expensive. However, there is great interest in the development of smaller and more affordable FELs.
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