20 December 2007 248 nm high fluence irradiation of CaF2 crystals
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Transmission, absorption and laser induced fluorescence (LIF) measurements were performed to reveal the applicability of different grade CaF2 for 248 nm laser applications. No emission from self-trapped excitions could be found in LIF measurements after irradiation with 100k pulses for all grades. Therefore, three-photon excitation could be excluded up to 1 J/cm2. Whereas emission at 420 nm and partially the double-peak at 313/333 nm could be found in LIF measurements. UV-VIS difference spectra did not show any absorption bands after 248 nm irradiation of the samples. Optical elements from CaF2 promise high life expectancy at 248 nm if a standard laser polish is used and hot spots are avoided.
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Alfons Burkert, Dietmar Keutel, Ute Natura, "248 nm high fluence irradiation of CaF2 crystals", Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67201K (20 December 2007); doi: 10.1117/12.752813; https://doi.org/10.1117/12.752813

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