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Proceedings Paper

Laser and Mach-Zehnder interferometry for in-situ monitoring of crystal growth and concentration variation
Author(s): Yong-Kee Kim; B. Rami Reddy; Ravindra B. Lal
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Paper Abstract

Interferometry is an essential field of optical metrology and is adapted in many applications in optics, crystal growth, and industry. Crystal growth rate is one of the critical parameters for the growth of optical quality single crystals. A laser interferometry technique has been developed and applied successfully for crystal growth rate measurement from solution. A He-Ne laser at the wavelength of 633 nm with an output power of 1.5 mW was used in this experiment. The beam was incident on the crystal growing from solution. As the crystal is growing, the path length of the front and back surface reflected beams changes hence the phase factor of the detector output signal changes continuously. This phase change is directly related to the growth of crystal. The growth rate of the LAP crystal was found to be 6.5 plus or minus 0.1 nm/s. A Mach-Zehnder interferometer, also, has been applied to study the variation of concentration at the interface of the growing crystal from solution.

Paper Details

Date Published: 6 July 1998
PDF: 9 pages
Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); doi: 10.1117/12.316447
Show Author Affiliations
Yong-Kee Kim, Alabama A&M Univ. (South Korea)
B. Rami Reddy, Alabama A&M Univ. (United States)
Ravindra B. Lal, Alabama A&M Univ. (United States)

Published in SPIE Proceedings Vol. 3479:
Laser Interferometry IX: Applications
Ryszard J. Pryputniewicz; Gordon M. Brown; Werner P. O. Jueptner, Editor(s)

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