Characteristic lengthscales of step bunching in KDP crystal growth: in situ differential phase-shifting interferometry study

被引:53
作者
Booth, NA [1 ]
Chernov, AA
Vekilov, PG
机构
[1] Univ Houston, Dept Chem Engn, Houston, TX 77204 USA
[2] Univ Space Res Assoc, Huntsville, AL 35806 USA
关键词
crystal morphology; interfaces; growth from solutions; phosphates; nonlinear optic materials;
D O I
10.1016/S0022-0248(01)02101-7
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
We have developed a real-time phase-shifting interferometer capable of imaging of interfacial morphology with a depth resolution of similar to 25 Angstrom and lateral resolution of similar to 0.5 mum across a field of view of 2 x 2 mm(2). The method employs a phase-shifting algorithm employing five interferograms and image processing that yield a three dimensional digital representation of the surface relief. The time resolution of imaging is 0.1 s. This method is applied in situ to the (1 0 1) face of potassium dihydrogen phosphate crystals growing from an aqueous solution. We image the formation and evolution of solution-flow induced step bunches and determine their characteristic wavelength to be lambda(c) = 45 mum. This wavelength is within the range predicted by a stability theory based on balance between the diffusion interaction between steps and capillarity. The found value suggests that step-step interactions are the likely major factor for instability. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:1818 / 1824
页数:7
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