In situ observation of crystal growth and concentration variation by spatial filtering method

Ya Chen; Qun Hao; Qiudong Zhu

doi:10.1117/12.574566

10 February 2005 In situ observation of crystal growth and concentration variation by spatial filtering method

Ya Chen, Qun Hao, Qiudong Zhu

Proceedings Volume 5638, Optical Design and Testing II; (2005) https://doi.org/10.1117/12.574566
Event: Photonics Asia, 2004, Beijing, China

Abstract

A spatial filtering method was developed for in-situ observing crystal growth and concentration variation. We insert a polarizing filter between the growth chamber and objective lens for eliminating the transmitted light through the solution. The dark background introduced by polarizing filtering method is advantaged for observing the sample. Due to the birefringence property, the image of crystal is contributed by extraordinary-ray and ordinary-ray through the crystal and analyzer. Meanwhile, a high pass binary amplitude filter is inserted on the back focal plane of the objective lens for attenuating low-frequency information and transfer phase information of the object to intensity information of the image. The image intensity has become squarely related to the phase shift φ of the crystal and solution. It is possible to observe the phase object and also to inverse the image contrast and strengthen the image edge. The method has been successfully used to observe not only crystal morphology and details but also concentration field variation around the growing crystal.

Citation Download Citation

Ya Chen, Qun Hao, and Qiudong Zhu "In situ observation of crystal growth and concentration variation by spatial filtering method", Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); https://doi.org/10.1117/12.574566

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KEYWORDS

Crystals

Linear filtering

Microscopes

Spatial filters

Optical filters

Objectives

Laser crystals

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