{"title":"248 nm high fluence irradiation of CaF2 crystals","authors":"A. Burkert, D. Keutel, U. Natura","doi":"10.1117/12.752813","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"61 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"SPIE Laser Damage","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1117/12.752813","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
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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