Second harmonic generation in transparent surface crystallized glasses with stillwellite-type LaBGeO5
Second harmonic generation in transparent surface crystallized glasses with stillwellite-type LaBGeO5
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DOI：
10.1063/1.1360699
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发表时间：
2001-05-15
影响因子：
3.2
通讯作者：
Komatsu, T
中科院分区：
文献类型：
--
作者：
Takahashi, Y;Benino, Y;Komatsu, T
通过两步热处理（第一次热处理：T-1=670℃，t（1）=10 h，第二次热处理：T-2，t（2））制备了化学计量为铁电硅锰矿型LaBGeO5晶相的透明光学非线性结晶玻璃，其组成为25La(2)O(3) 25B(2)O(3) 50GeO(2)，及其第二次热处理使用 Maker 条纹方法检查了谐波 (SH) 强度。通过在T-2=720（类似于725℃）下热处理t(2)=3小时获得的样品仅显示出表面结晶并表现出清晰且细（窄）的条纹图案。在T-2=740和750℃下热处理的样品表现出相对强的SH强度，但这些样品中的条纹图案很宽。有人提出，表面LaBGeO5晶体层产生的SH波在玻璃内部形成的LaBGeO5晶体处散射，导致精细条纹图案消失。 (C) 2001 年美国物理研究所。
Transparent optical nonlinear crystallized glasses with the composition of 25La(2)O(3) 25B(2)O(3) 50GeO(2), stoichiometric to ferroelectric stillwellite-type LaBGeO5 crystalline phase, have been prepared by a two-step heat-treatment (first heat treatment: T-1=670 degreesC, t(1)=10 h, second heat-treatment: T-2, t(2)), and their second harmonic (SH) intensities have been examined using the Maker fringe method. The samples obtained by heat treatments at T-2=720 similar to 725 degreesC for t(2)=3 h show only surface crystallization and exhibit clear and fine (narrow) fringe patterns. The samples heat treated at T-2=740 and 750 degreesC exhibit relatively strong SH intensities, but the fringe patterns in such samples are broad. It is proposed that SH waves generated from surface LaBGeO5 crystalline layers scatter at LaBGeO5 crystals formed in the interior of glass, causing the disappearance of fine fringe patterns. (C) 2001 American Institute of Physics.