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Proceedings Paper

Real-time measurement of refractive index of solution during crystal growth by Michaelson interferometry
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Paper Abstract

In the real-time monitoring of variations of concentration and temperature of solution by means of contacless interferometry, real-time measurement of changes of refractive index of the solution is prerequisite and essential for post calculation processes. A novel real-time polarized light phase shifting interferometry is proposed in this paper, which was applied to Michaelson type interferometer. Although phase-shifting interferometry provides high spatial resolution, the conventional phase shifting technique by the mechanical movement has not been applied to real-time measurement during crystal growth, due to its physical limitations. We developed a method, using polarized light, and made the real-time measurement possible. The 17% undersaturation aqueous solution of KDP at 20°C was selected as specimen to measure its refractive index during crystal growth. It is found that the present method is a few ten times more sensitive than traditional two-beam interferometry, and more accessible to applications of real-time measurements.

Paper Details

Date Published: 10 February 2005
PDF: 6 pages
Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005);
Show Author Affiliations
Yi Wang, Beijing Institute of Technology (China)
Qun Hao, Beijing Institute of Technology (China)
Qiudong Zhu, Beijing Institute of Technology (China)
Yongtian Wang, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 5638:
Optical Design and Testing II
Yongtian Wang; Zhicheng Weng; Shenghua Ye; Jose M. Sasian, Editor(s)

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