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13 May 2019 Study of molten zone profile and defect formation during laser heated pedestal growth
B. Liu, Y. Yu, S. Bera, M. Buric, B. Chorpening, P. Ohodnicki
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Proceedings Volume 10982, Micro- and Nanotechnology Sensors, Systems, and Applications XI; 109822K (2019) https://doi.org/10.1117/12.2518935
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States
Abstract
High quality single crystal sapphire optical fiber is important not only for its capacity for high laser power delivery, but also for applications in harsh environment sensing. Improving the quality of Laser Heated Pedestal Growth (LHPG) fabricated single crystal fiber has been a long-term effort for decades. The equilibrium state during crystal growth and defect formation rate are the two most important factors in single crystal fiber fabrication. In this paper, we study the theory governing the molten zone profile and verify the theoretical predictions with a high-resolution CCD camera. We also study defect formation during the crystal growth process and observed dislocation defects with transmission electron microscopy (TEM). These analyses will help to guide high quality single crystal fiber fabrication and hopefully will lead to the production of better fibers for harsh-environment sensing applications.
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B. Liu, Y. Yu, S. Bera, M. Buric, B. Chorpening, and P. Ohodnicki "Study of molten zone profile and defect formation during laser heated pedestal growth", Proc. SPIE 10982, Micro- and Nanotechnology Sensors, Systems, and Applications XI, 109822K (13 May 2019); https://doi.org/10.1117/12.2518935
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KEYWORDS
Crystals
Sapphire
Laser crystals
Fiber lasers
Transmission electron microscopy
Cameras
Optical fibers
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