Development of the Broadband and Dual-band Cavity Mirrors for SR-FEL at 355nm and 248nm

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GAO Huai-Lin, WANG Nai-Yan, WANG Dong-Lei and WANG Yong. Development of the Broadband and Dual-band Cavity Mirrors for SR-FEL at 355nm and 248nm[J]. Chinese Physics C, 2007, 31(4): 405-408.
GAO Huai-Lin, WANG Nai-Yan, WANG Dong-Lei and WANG Yong. Development of the Broadband and Dual-band Cavity Mirrors for SR-FEL at 355nm and 248nm[J]. Chinese Physics C, 2007, 31(4): 405-408. shu
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Received: 2006-08-08
Revised: 2006-09-14
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Development of the Broadband and Dual-band Cavity Mirrors for SR-FEL at 355nm and 248nm

    Corresponding author: GAO Huai-Lin,
  • Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China2 China Institute of Atomic Energy, Beijing 102413,China

Abstract: The cavity mirrors of the storage-ring free-electron laser (SR-FEL) at 355nm and 248nm central wavelengths have been developed with the technologies of electron-beam evaporation deposition and ion-beam sputter deposition. The mirror coatings consists of “HfO2/SiO2+Al2O3/SiO2+M-SiO2”.The absolute reflectance and frequency-tunable range at 355nm are R=99.45% and Δλ(R≥99.00%)=75nm, respectively, for the broadband resonator mirror. For the mirror with the dual-central wavelengths, R=99.69% and Δλ(R≥99.00%)=59nm for the first band at 355nm; For the second band at 248nm, R=98.21%, Δλ(R≥99.00%)=9nm and Δλ(R≥98.00%)=51nm.

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