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《Chinese Journal of Luminescence》 2001-03
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Broad Band Photoluminescence in Active Channels Produced by Electron Beam Lithography on LiF Films

ZHENG Jie 1, LI Yan 1, XU Mai 1, FAN X W, Righini G C 2 (1 Laboratory of Excited State Processes, Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130021, China; 2 I  
Alkali halide crystals containing color centers (CCs) are well known as laser active media in optically pumped tunable solid state lasers generally operating at liquid nitrogen temperature . Among them, lithium fluoride has several unique characteristics because it can hold laser active defects stable at room temperature (RT) and emit in the visible and near infrared. Despite the deep knowledge on alkali halide crystals, little attention was devoted to non epitaxial alkali halide films. In the last years we devoted our attention to the growth and characterization of LiF films in order to study the spectroscopic properties of CCs created by low energy electron beams for application in integrated active devices. Polycrystalline LiF thin films of total thickness t between 0 5 and 3 8μm were grown by thermal evaporation on amorphous substrates, mantained at fixed temperature T s between 30 and 350℃ during deposition . Their structural, morphological and optical properties are strongly dependent on the evaporation parameters, especially on T s. Low energy electron beam irradiation gives rise to the efficient formation of stable F 2 and F 3 + centers. Properties of photoluminescence at room temperature were studied. It shows that active channels (F 2 and F 3 + centers) with sizeable optical gain and a substantial increase of the refractive index are promising for the realization of active optical waveguide devices which are tunable in the visible.
【Fund】: 国家自然科学基金 ( 6 99770 2 0;6 98880 0 3 ;5 9872 0 41);; 中国科学院留学基金资助项目
【CateGory Index】: O482.31
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