248nm高通量辐照CaF2晶体

A. Burkert, D. Keutel, U. Natura
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引用次数: 5

摘要

通过透射、吸收和激光诱导荧光(LIF)测试,揭示了不同等级CaF2在248 nm激光应用中的适用性。在所有等级的100k脉冲辐照后的LIF测量中都没有发现自俘获激发的发射。因此,三光子激发可以排除高达1 J/cm2。而在LIF测量中可以发现420 nm的发射和部分313/333 nm的双峰。经248nm辐照后,紫外-可见光谱没有发现任何吸收带。如果使用标准的激光抛光,并且避免了热点,CaF2光学元件在248nm处具有很高的预期寿命。
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248 nm high fluence irradiation of CaF2 crystals
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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