| Tm,Ho:BaY2Fg laser crystal is a new type of near-infrared laser crystal materials, which is excited to be obtained 2um laser.2μm laser have a lot of advantages, such as good transmission performance, easyly be absorbed by biological tissue, Human eye harmless and so on. Now it has been widely used in the military, medicine, biology etc. The upconversion performance of Tm,Ho;BaY2F8 laser crystal can realize laser upconversion output.In the paper, it is introduced that the Tm,Ho:BaY2F8 polycrystalline material had be obtained and Tm,Ho:BaY2F8 laser crystal had be grown. XRD, TG-DSC, fluorescent spectroscopy and Field emission scanning electron microscopy have been used to study structure and spectral properties of polycrystalline material and crystal.The XRD results showed that Tm,Ho:BaY2Fg polycrystalline material was obtained at 960℃by the High-temperature solid-phase method. Crystal particle size was about 200nm-550nm, and the degree of crystallinity was 76.88%. that double crucible is used in experiment can improve polycrystalline material quality.5%Tm,0.5%Ho:BaY2F8 crystal is grown by Czochralski method, which is analysised by XRD, Absorption spectroscopy and Stimulate spectrum. The absorption bands between 700nm and 85Onm attributed to the Tm3+:3H6â†'3H4 level transition. The absorption bands between 1400nm and 2100nm attributed to the Tm3+:JH6â†'3F4 level transition and Ho3+:5I8â†'5I7 level transition.5%Tm,0.5%Ho:BaY2F8 crystal is stimulated by 780nm laser to get 2.056μm near infrared laser.Tm,Ho:BaY2F8nanoscale crystals is successfully grown by hydrothermal method. We had got the best process parameters by XRD concluded. Crystal morphology was analysised by Field emission scanning electron microscopy. According to the fluorescence spectrum analysis, the results showed that when the doping concentration 5%Tm3+and 0.5%Ho3+of Tm,Ho:BaY2F8 nanoscale crystals, the Up-conversion efficiency is the highest. |
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