近化学计量比铌酸锂晶体生长的新方法(英文)

A NEW CRYSTAL GROWTH METHOD FOR THE GROWTH OF NEAR-STOICHIOMETRIC LiNbO_3

在计算机温场模拟的基础上,探索设计了悬挂式双坩埚和均匀加料装置。在富锂(Li2O摩尔分数为58.5%)熔体中采用提拉法生长了φ50mm×50mm的近化学计量比铌酸锂晶体。测量结果表明:晶体的紫外吸收边发生了明显的蓝移,测得Li摩尔分数达到49.87%。利用干涉仪测量样品的光学均匀性,生长晶体均方根折射率不均匀性?n=7.250×10-5 cm-1。

By means of temperature field computer design,a new crystal growth method called the hanging double crucible pulling method was developed.With a steady polycrystalline raw material feeding rate,near-stoichiometric lithium niobate(NSLN) crystal(φ 50 mm × 50 mm) has been successfully grown in Li-rich melt(with Li2O mole fraction(the same below) of 58.5%).The absorption spectrum of the crystal shows that when the Li content reaches 49.87%,an obvious ultraviolet absorption edge shift occurs.The optical homogene...