Study on the UV FEL single-shot damage threshold of an Au thin film

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Abstract
The damage threshold of an Au-coated flat mirror, one of the reflective optics installed on the FEL-2 beamline of the Dalian Coherent Light Source, China, upon far-UV free-electron laser irradiation is evaluated. The surface of the coating is characterized by profilometer and optical microscope. A theoretical approach of the phenomenon is also presented, by application of conventional single-pulse damage threshold calculations, a one-dimensional thermal diffusion model, as well as finite-element analysis with ANSYS.
Funding Information
  • National Natural Science Foundation of China (12305360, 22288201)
  • Scientific Instrument Developing Project of the Chinese Academy of Sciences (GJJSTD20190002)
  • Shenzhen Science and Technology Program (RCBS20221008093327057)

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