15 January 2007 Xtreme optics: the behavior of cavity optics for the Jefferson Lab Free-Electron Laser
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Abstract
The cavity optics within high power free-electron lasers based on energy-recovering accelerators are subjected to extreme conditions associated with illumination from a broad spectrum of radiation, often at high irradiances. This is especially true for the output coupler, where absorption of radiation by both the mirror substrate and coating places significant design restrictions to properly manage heat load and prevent mirror distortion. Besides the fundamental lasing wavelength, the mirrors are irradiated with light at harmonics of the fundamental, THz radiation generated by the bending magnets downstream of the wiggler, and x-rays produced when the electron beam strikes accelerator diagnostic components (e.g., wire scanners and view screens) or from inadvertent beam loss. The optics must reside within high vacuum at ~ 10-8 Torr and this requirement introduces its own set of complications. This talk discusses the performance of numerous high reflector and output coupler optics assemblies and provides a detailed list of lessons learned gleaned from years of experience operating the Upgrade IR FEL, a 10 kW-class, sub-ps laser with output wavelength from 1 to 6 microns.
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Michelle Shinn, Christopher Behre, Stephen Benson, David Douglas, Fred Dylla, Christopher Gould, Joseph Gubeli, David Hardy, Kevin Jordan, George Neil, Shukui Zhang, "Xtreme optics: the behavior of cavity optics for the Jefferson Lab Free-Electron Laser", Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 64030Y (15 January 2007); doi: 10.1117/12.696816; https://doi.org/10.1117/12.696816
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