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Journals →  Materialy Elektronnoi Tekhniki →  2011 →  #3 →  Back

MATERIALS SCIENCE AND TECHNOLOGY. DIELECTRICS
ArticleName Damage testing of diamond optics under high power fiber laser irradiation
ArticleAuthor V. E. Rogalin, E. E. Ashkinazi, A. F. Popovich, V. G. Ralchenko, V. I. Konov, S. M. Aranchy, M. V. Ruzin, S. A. Uspensky
ArticleAuthorData V. E. Rogalin, FSUE «SPA ASTROPHYSICA»; E. E. Ashkinazi; A. F. Popovich; V. G. Ralchenko; V. I. Konov, A. M. Prokhorov General Physics Institute of Russian Academy of sciences; S. M. Aranchy, FSUE «SPA ASTROPHYSICA»; M. V. Ruzin, Ltd «Lamet»; S. A. Uspensky, Institute of Functional Nuclear Electronics NRNU MEPHI.
Abstract

Performance of polycrystalline CVD diamond window and mirror (25 mm diameter, 1,3 mm thickness) with 1970 W/mK thermal conductivity under irradiation of continuous wave 10 kW ytterbium fiber laser (1,07 μm) has been tested. The window withstood 11,7 МW/cm2 power density without any disturbance of the beam quality, while the dielectric 25 layer diamond−based mirror was damaged at 8,2 МW/cm2. Experimental and numerical modeling has shown that proper mounting in a water−cooled copper flange allows keeping the maximum temperature in the window at below 100 °C for incident laser power of as high as 35 kW. Because of the unique properties of this material, diamond optics is promising for high power laser applications.
keywords Polycrystalline diamond, CVD diamond, diamond growth in microwave plasma, IR lasers, window, mirror, thermal conductivity, laser radiation resistanc.
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