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在生长LiNbO_3的熔体中掺进1%(摩尔分数,下同)的Ho_2O_3和分别掺入1%,4%,5% MgO,用提拉法生长Mg:Ho:LiNbO_3晶体。测量了晶体的光谱性能和抗激光损伤能力。结果表明:5%Mg:1%Ho:LiNbO_3晶体红外光谱的OH~-吸收峰移到3 534cm~(-1);晶体抗光损伤能力比LiNbO_3晶体提高2个数量级以上。随着Mg:Ho:LiNbO_3晶体中Mg~(2+)浓度的增加,吸收光谱中吸收边连续紫移;Mg:Ho:LiNbO_3晶体最强的跃迁光谱项为~5I_8→~5G_6,对应的吸收波长为459nm,是最佳泵浦波长。晶体的荧光光谱表明:Mg:Ho:LiNbO_3晶体较易实现激光振荡的是~4S_2→~5I_8和~5I_7→~5I_8跃迁,对应的发射波长分别为546nm和2011 nm。选用波长为620nm的激光激发Mg:Ho:LiNbO_3晶体,由其上转换荧光光谱得到波长为523nm的荧光,实现了红绿光的转换。
In the growth of LiNbO_3 melt 1% (mole fraction, the same below) Ho_2O_3 and were doped with 1%, 4%, 5% MgO, Czochralski method by the growth of Mg: Ho: LiNbO_3 crystal. The crystal’s spectral properties and resistance to laser damage were measured. The results show that the OH ~ - absorption peak of 5% Mg: 1% Ho: LiNbO_3 crystal shifts to 3 534 cm -1, and the light damage resistance of crystal increases more than two orders of magnitude compared with that of LiNbO_3 crystal. With the increase of Mg 2+ concentration in Mg: Ho: LiNbO_3 crystal, the absorption edge of the Mg: Ho: LiNbO_3 crystal has a continuous violet shift. The strongest transition of Mg: Ho: LiNbO_3 crystal is ~ 5I_8 → ~ 5G_6, Wavelength of 459nm, is the best pump wavelength. The fluorescence spectra of Mg: Ho: LiNbO_3 crystals show that they are easier to be excited by the laser oscillation, and their corresponding emission wavelengths are 546 nm and 2011 nm, respectively. The Mg: Ho: LiNbO_3 crystal is excited by a laser with a wavelength of 620 nm, and the fluorescent light with the wavelength of 523 nm is converted from the up-converted fluorescence spectrum to realize the conversion of red and green light.