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6 July 1998 Laser and Mach-Zehnder interferometry for in-situ monitoring of crystal growth and concentration variation
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yong-Kee Kim, B. Rami Reddy, and Ravindra B. Lal "Laser and Mach-Zehnder interferometry for in-situ monitoring of crystal growth and concentration variation", Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); https://doi.org/10.1117/12.316447
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