Abstract: Based on the BFEL improvement goals, this paper discusses the main physical and technical problems of dual-band operation of BFEL facility in IR and X-ray ranges by Compton scattering.

• 摘 要： 讨论了北京自由电子激光装置升级后实现红外和X射线双波段运行的主要物理和技术问题及其解决途径，并进行了初步设计。