近化学计量比Mn：Fe：LiNbO_3晶体的生长及其光学性能(英文)

GROWTH OF NEAR STOICHIOMETRIC Mn:Fe:LiNbO_3 CRYSTAL AND ITS OPTICAL CHARACTERIZATION

采用助熔剂提拉法,从掺入0.1%(摩尔分数)Fe_2O_3,0.2%MnO和11.2% K_2CO_3的同成分LiNbO_3熔体中生长出高质量近化学计量比Mn:Fe:LiNbO_3晶体。采用提拉法生长了相同掺杂的同成分晶体。与同成分晶体相比较,近化学计量比晶体的紫外吸收发生紫移,红外吸收变窄。利用二波耦合光路测试了晶体的衍射效率、增益系数和响应时间。结果显示:近化学计量比晶体的增益系数和衍射效率分别达到25 cm^(-1)和68.3%,响应时间为亚秒级。

Near stoichiometric lithium niobate crystal doped with 0.1% （molar fraction, the same bellow） Fe2O3 and 0.2%MnO and 11.2% KECO3 was grown by the flux method and congruent crystal with the same dopants was grown by Czochralski method. The crystals were characterized by ultraviolet absorption edge, and infrared spectra. The crystal has a shift in absorption towards shorter wavelength and infrared absorption peak shifts to smaller to form a sharp band. The exponential gain coefficient, diffraction efficiency and response time were measured by a two-wave coupling method. The results indicate that the exponential gain coefficient and diffraction efficiency of the near stoichiometric crystal reach to 25 cm^-1 and 68.3%, respectively, while response time is less than 1 second.